Climate and land use models predict that tropical deforestation and conversion to cropland will produce a large flux of soil carbon (C) to the atmosphere from accelerated decomposition of soil organic matter (SOM). However, the C flux from the deep tropical soils on which most intensive crop agriculture is now expanding remains poorly constrained. To quantify the effect of intensive agriculture on tropical soil C, we compared C stocks, radiocarbon, and stable C isotopes to 2\uffc2\uffa0m depth from forests and soybean cropland created from former pasture in Mato Grosso, Brazil. We hypothesized that soil disturbance, higher soil temperatures (+2\uffc2\uffb0C), and lower OM inputs from soybeans would increase soil C turnover and deplete C stocks relative to nearby forest soils. However, we found reduced C concentrations and stocks only in surface soils (0\uffe2\uff80\uff9310\uffc2\uffa0cm) of soybean cropland compared with forests, and these differences could be explained by soil mixing during plowing. The amount and \uffce\uff9414C of respired CO2 to 50\uffc2\uffa0cm depth were significantly lower from soybean soils, yet CO2 production at 2\uffc2\uffa0m deep was low in both forest and soybean soils. Mean surface soil \uffce\uffb413C decreased by 0.5\uffe2\uff80\uffb0 between 2009 and 2013 in soybean cropland, suggesting low OM inputs from soybeans. Together these findings suggest the following: (1) soil C is relatively resistant to changes in land use and (2) conversion to cropland caused a small, measurable reduction in the fast\uffe2\uff80\uff90cycling C pool through reduced OM inputs, mobilization of older C from soil mixing, and/or destabilization of SOM in surface soils.
", "keywords": ["tropical forest", "2. Zero hunger", "Life on Land", "land use", "Agriculture", "04 agricultural and veterinary sciences", "15. Life on land", "Soil carbon", "Geophysics", "Tropical forest", "Isotopes", "13. Climate action", "Land use", "Earth Sciences", "0401 agriculture", " forestry", " and fisheries", "soil carbon", "Brazil", "isotopes", "Research Articles", "agriculture"]}, "links": [{"href": "https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017JG004269"}, {"href": "https://escholarship.org/content/qt4jm295dz/qt4jm295dz.pdf"}, {"href": "https://doi.org/10.1002/2017JG004269"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Geophysical%20Research%3A%20Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/2017JG004269", "name": "item", "description": "10.1002/2017JG004269", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/2017JG004269"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-01-01T00:00:00Z"}}, {"id": "10.1002/2017jg004269", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:14:00Z", "type": "Journal Article", "created": "2017-12-18", "title": "Soil Carbon Dynamics in Soybean Cropland and Forests in Mato Grosso, Brazil", "description": "AbstractClimate and land use models predict that tropical deforestation and conversion to cropland will produce a large flux of soil carbon (C) to the atmosphere from accelerated decomposition of soil organic matter (SOM). However, the C flux from the deep tropical soils on which most intensive crop agriculture is now expanding remains poorly constrained. To quantify the effect of intensive agriculture on tropical soil C, we compared C stocks, radiocarbon, and stable C isotopes to 2\uffc2\uffa0m depth from forests and soybean cropland created from former pasture in Mato Grosso, Brazil. We hypothesized that soil disturbance, higher soil temperatures (+2\uffc2\uffb0C), and lower OM inputs from soybeans would increase soil C turnover and deplete C stocks relative to nearby forest soils. However, we found reduced C concentrations and stocks only in surface soils (0\uffe2\uff80\uff9310\uffc2\uffa0cm) of soybean cropland compared with forests, and these differences could be explained by soil mixing during plowing. The amount and \uffce\uff9414C of respired CO2 to 50\uffc2\uffa0cm depth were significantly lower from soybean soils, yet CO2 production at 2\uffc2\uffa0m deep was low in both forest and soybean soils. Mean surface soil \uffce\uffb413C decreased by 0.5\uffe2\uff80\uffb0 between 2009 and 2013 in soybean cropland, suggesting low OM inputs from soybeans. Together these findings suggest the following: (1) soil C is relatively resistant to changes in land use and (2) conversion to cropland caused a small, measurable reduction in the fast\uffe2\uff80\uff90cycling C pool through reduced OM inputs, mobilization of older C from soil mixing, and/or destabilization of SOM in surface soils.2) and methane (CH4) production and consumption. In this study, we examined the combined effect of a reduction in precipitation and an increase in nutrient availability on soil CO2 and CH4 fluxes in a primary French Guiana tropical forest. Drought conditions were simulated by intercepting precipitation falling through the forest canopy with tarpaulin roofs. Nutrient availability was manipulated through application of granular N and / or phosphorus (P) fertilizer to the soil. Soil water content (SWC) below the roofs decreased rapidly and stayed at continuously low values until roof removal, which as a consequence roughly doubled the duration of the dry season. After roof removal, SWC slowly increased but remained lower than in the control soils even after 2.5 months of wet-season precipitation. We showed that drought-imposed reduction in SWC decreased the CO2 emissions (i.e CO2 efflux), but strongly increased the CH4 emissions. N, P and N \u00d7 P (i.e. NP) additions all significantly increased CO2 emission but had no effect on CH4 fluxes. In treatments where both fertilization and drought were applied, the positive effect of N, P and NP fertilization on CO2 efflux was reduced. After roof removal, soil CO2 efflux was more resilient in the control plots than in the fertilized plots while there was only a modest effect of roof removal on soil CH4 fluxes. Our results suggest that a combined increase in drought and nutrient availability in soil can locally increase the emissions of both CO2 and CH4 from tropical soils, for a long term.", "keywords": ["tropical forest", "[SDE] Environmental Sciences", "550", "Nitrogen", "soil GHG fluxes", "drought", "01 natural sciences", "nitrogen", "Tropical forest", "GE1-350", "phosphorus", "Biology", "0105 earth and related environmental sciences", "2. Zero hunger", "Drought", "methane", "carbon dioxide", "Phosphorus", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water", "Environmental sciences", "Chemistry", "Carbon dioxide", "fertilization", "13. Climate action", "Fertilization", "[SDE]Environmental Sciences", "0401 agriculture", " forestry", " and fisheries", "Soil GHG fluxes", "Methane"]}, "links": [{"href": "https://doi.org/10.3389/fenvs.2019.00180"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Frontiers%20in%20Environmental%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3389/fenvs.2019.00180", "name": "item", "description": "10.3389/fenvs.2019.00180", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3389/fenvs.2019.00180"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-11-13T00:00:00Z"}}, {"id": "10.1088/1748-9326/aa7145", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:05Z", "type": "Journal Article", "created": "2017-05-05", "title": "Vegetation anomalies caused by antecedent precipitation in most of the world", "description": "Quantifying environmental controls on vegetation is critical to predict the net effect of climate change on global ecosystems and the subsequent feedback on climate. Following a non-linear Granger causality framework based on a random forest predictive model, we exploit the current wealth of multi-decadal satellite data records to uncover the main drivers of monthly vegetation variability at the global scale. Results indicate that water availability is the most dominant factor driving vegetation globally: about 61% of the vegetated surface was primarily water-limited during 1981\u20132010. This included semiarid climates but also transitional ecoregions. Intra-annually, temperature controls Northern Hemisphere deciduous forests during the growing season, while antecedent precipitation largely dominates vegetation dynamics during the senescence period. The uncovered dependency of global vegetation on water availability is substantially larger than previously reported. This is owed to the ability of the framework to (1) disentangle the co-linearities between radiation/temperature and precipitation, and (2) quantify non-linear impacts of climate on vegetation. Our results reveal a prolonged effect of precipitation anomalies in dry regions: due to the long memory of soil moisture and the cumulative, non-linear, response of vegetation, water-limited regions show sensitivity to the values of precipitation occurring three months earlier. Meanwhile, the impacts of temperature and radiation anomalies are more immediate and dissipate shortly, pointing to a higher resilience of vegetation to these anomalies. Despite being infrequent by definition, hydro-climatic extremes are responsible for up to 10% of the vegetation variability during the 1981\u20132010 period in certain areas, particularly in water-limited ecosystems. Our approach is a first step towards a quantitative comparison of the resistance and resilience signature of different ecosystems, and can be used to benchmark Earth system models in their representations of past vegetation sensitivity to changes in climate.", "keywords": ["Science", "QC1-999", "water", "TROPICAL FORESTS", "0207 environmental engineering", "02 engineering and technology", "SOIL-MOISTURE", "Environmental technology. Sanitary engineering", "01 natural sciences", "stress", "water stress", "global vegetation", "AMAZON", "FORESTS", "CLIMATE EXTREMES", "hydro-climatic extremes", "ecosystem resilience", "DRY-SEASON", "GE1-350", "TEMPERATURE", "SATELLITE", "TD1-1066", "0105 earth and related environmental sciences", "Physics", "Q", "Biology and Life Sciences", "15. Life on land", "6. Clean water", "Environmental sciences", "NDVI DATA", "13. Climate action", "Earth and Environmental Sciences", "GROWING-SEASON", "Granger causality", "CARBON-CYCLE"]}, "links": [{"href": "https://doi.org/10.1088/1748-9326/aa7145"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Research%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1088/1748-9326/aa7145", "name": "item", "description": "10.1088/1748-9326/aa7145", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1088/1748-9326/aa7145"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-07-01T00:00:00Z"}}, {"id": "10.1023/a:1005880031579", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:17:19Z", "type": "Journal Article", "description": "Dynamics of soil organic carbon (SOC) inchronosequences of soils below forests that had beenreplaced by grazed pastures 3\u201325 years ago, wereinvestigated for two contrasting soil types (AndicHumitropept and Eutric Hapludand) in the Atlantic Zoneof Costa Rica. By forest clearing and subsequentestablishment of pastures, photosynthesis changes froma C-3 to a C-4 pathway. The accompanying changes inC-input and its \u03b413C and 14Csignals, were used to quantify SOC dynamics. C-input from rootturnover at a pasture site was measured by sequentialharvesting and 14C-pulse labelling. With aspatial resolution of 5 cm, data on total SOC,\u03b413C and \u03b414C of soil profileswere interpreted with a model that distinguishes threepools of SOC: \u2018active\u2019 C, \u2018slow\u2019 C and \u2018passive\u2019 C,each with a 1-st order decomposition rate(ka, ks and kp). The modelincludes carbon isotope fractionation and depth-dependentdecomposition rates. Transport of C between soillayers was described as a diffusion process, whichaccounts for physical and biotic mixing processes. Calibrated diffusion coefficients were 0.42 cm2yr-1 for the Humitropept and 3.97 cm2yr-1 for the Hapludand chronosequence.Diffusional transport alone was insufficient foroptimal simulation; it had to be augmented bydepth-dependent decomposition rates to explain thedynamics of SOC, \u03b413C and\u03b414C. Decomposition rates decreasedstrongly with depth. Upon increased diffusion,differences between calibrated decomposition rates ofSOC fractions between surface soils and subsoilsdiminished, but the concept of depth-dependentdecomposition had to be retained, to obtain smallresiduals between observed and simulated data. At areference depth of 15\u201320 cm ks was 90 yr-1in the Humitropept and 146 yr-1 in the Hapludand.Slow C contributed most to total organic C in surfacesoils, whereas passive C contributed most below 40 cmdepth. After 18\u201325 years of pasture, net loss of C was2180 g C m-2 for the Hapludand and 150 g m-2for the Humitropept soil.", "keywords": ["land use change; model; soil organic carbon; tropical forest", "soil chemistry", "zoning", "land use", "physical planning", "costa rica", "organic compounds", "soil"]}, "links": [{"href": "https://doi.org/10.1023/a:1005880031579"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biogeochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1023/a:1005880031579", "name": "item", "description": "10.1023/a:1005880031579", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/a:1005880031579"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1997-01-01T00:00:00Z"}}, {"id": "10.1023/a:1023930805422", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:17:22Z", "type": "Journal Article", "created": "2003-06-09", "description": "An \u2018integrated tree plantation\u2019 approach combining indigenous livelihoods and industrial wood production is being implemented in West Kalimantan, Indonesia. In this study the economics of land-use was investigated in villages within the plantation scheme. The effect of three alternative land-use scenarios and costs and benefits of each land-use type were studied using linear programming. The scenarios were based 1) on the current land-use, 2) on the integrated tree plantation system with incentives and government regulations, and 3) on a financially optimal land-use distribution. Additionally, plant species richness in different land-use types was surveyed. The scenarios had different kinds of effects on villages varying in respect to their possibilities for land-use intensification. In villages with extensive land use, establishment of tree plantations without any land-use regulations increased the potential economic return on land, resulting in conversion of natural and man-made semi-natural forests into swidden fields. In villages with more sedentary agriculture, the plantation scheme did not create pressures towards remaining forests even in the case of financially optimal land-use distribution. Incorporation of land-use regulations prevented further deforestation but also decreased households' economic returns. The results also showed that conversion of Imperata grasslands to any other land-use increased species richness. Incentives, restrictions or regulations aiming at conserving natural and semi-natural forests are needed to ensure conservation of biodiversity and long-term improvements in local livelihoods. It can be concluded that tree plantations can be combined with other land-use practices: They can improve the economic return on land without further degradation of the environment.", "keywords": ["tropical forests", "2. Zero hunger", "0106 biological sciences", "lineaarinen optimointi", "linear programming", "metsien h\u00e4vi\u00e4minen", "04 agricultural and veterinary sciences", "15. Life on land", "01 natural sciences", "300", "trooppiset mets\u00e4t", "Acacia mangium", "11. Sustainability", "deforestation", "0401 agriculture", " forestry", " and fisheries", "Yl", "14. Life underwater", "metsitys", "reforestation"], "contacts": [{"organization": "Tyynel\u00e4, Tapani, Otsamo, Riikka, Otsamo, Antti,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1023/a:1023930805422"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1023/a:1023930805422", "name": "item", "description": "10.1023/a:1023930805422", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/a:1023930805422"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2003-02-01T00:00:00Z"}}, {"id": "10.1088/1748-9326/abd58a", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:05Z", "type": "Journal Article", "created": "2020-12-22", "title": "Coarse woody debris are buffering mortality-induced carbon losses to the atmosphere in tropical forests", "description": "International audience", "keywords": ["tropical forests", "0301 basic medicine", "[SDU.OCEAN]Sciences of the Universe [physics]/Ocean", "0303 health sciences", "Atmosphere", "[SDU.OCEAN] Sciences of the Universe [physics]/Ocean", " Atmosphere", "Science", "Physics", "QC1-999", "coarse woody debris", "Q", "15. Life on land", "mortality", "Environmental technology. Sanitary engineering", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "Environmental sciences", "carbon budget", "03 medical and health sciences", "13. Climate action", "GE1-350", "[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces", "environment", "TD1-1066"]}, "links": [{"href": "https://doi.org/10.1088/1748-9326/abd58a"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Research%20Letters", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1088/1748-9326/abd58a", "name": "item", "description": "10.1088/1748-9326/abd58a", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1088/1748-9326/abd58a"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2021-01-01T00:00:00Z"}}, {"id": "10.1038/srep08280", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:17:38Z", "type": "Journal Article", "created": "2015-02-06", "title": "Convergence Of Soil Nitrogen Isotopes Across Global Climate Gradients", "description": "Abstract
Quantifying global patterns of terrestrial nitrogen (N) cycling is central to predicting future patterns of primary productivity, carbon sequestration, nutrient fluxes to aquatic systems and climate forcing. With limited direct measures of soil N cycling at the global scale, syntheses of the 15N:14N ratio of soil organic matter across climate gradients provide key insights into understanding global patterns of N cycling. In synthesizing data from over 6000 soil samples, we show strong global relationships among soil N isotopes, mean annual temperature (MAT), mean annual precipitation (MAP) and the concentrations of organic carbon and clay in soil. In both hot ecosystems and dry ecosystems, soil organic matter was more enriched in 15N than in corresponding cold ecosystems or wet ecosystems. Below a MAT of 9.8\uffc2\uffb0C, soil \uffce\uffb415N was invariant with MAT. At the global scale, soil organic C concentrations also declined with increasing MAT and decreasing MAP. After standardizing for variation among mineral soils in soil C and clay concentrations, soil \uffce\uffb415N showed no consistent trends across global climate and latitudinal gradients. Our analyses could place new constraints on interpretations of patterns of ecosystem N cycling and global budgets of gaseous N loss.
", "keywords": ["N-15 Natural-Abundance", "550", "Ecosystem ecology", "TROPICAL FORESTS", "Organic chemistry", "Suelo", "Nitrogen cycle", "01 natural sciences", "Nutrient cycle", "cycle de l'azote", "CARBON", "Agricultural and Biological Sciences", "Soil", "Terrestrial ecosystem", "Isotopes", "https://purl.org/becyt/ford/1.6", "Soil water", "SDG 13 - Climate Action", "N-15 NATURAL-ABUNDANCE", "Climate change", "croisement de donn\u00e9es", "Milieux et Changements globaux", "SDG 15 \u2013 Leben an Land", "Global change", "SDG 15 - Life on Land", "2. Zero hunger", "106022 Mikrobiologie", "Climatic Factors", "Tropical Forests", "Ecology", "Geography", "Nitr\u00f3geno", "Nutrient Cycling", "FRACTIONATION", "Litter Decomposition", "ECOSYSTEM ECOLOGY", "Life Sciences", "ecosystem ecology", "Cycling", "Forestry", "Is\u00f3topos", "Carbon cycle", "04 agricultural and veterinary sciences", "Nitrogen Cycle", "Soil carbon", "6. Clean water", "Organic-Matter", "Earth and Planetary Sciences", "ORGANIC-MATTER", "Chemistry", "PRECIPITATION", "SDG 13 \u2013 Ma\u00dfnahmen zum Klimaschutz", "Physical Sciences", "106022 Microbiology", "carbone du sol", "Stable Isotope Analysis of Groundwater and Precipitation", "Ecosystem Functioning", "570", "STABLE ISOTOPE", "Biogeochemical Cycling of Nutrients in Aquatic Ecosystems", "Stable isotope analysis", "Nitrogen", "[SDE.MCG]Environmental Sciences/Global Changes", "Soil Science", "stable isotope analysis;ecosystem ecology", "Article", "Environmental science", "LITTER DECOMPOSITION", "sol min\u00e9ral", "INORGANIC NITROGEN", "Geochemistry and Petrology", "stable isotope analysis", "Carbono", "Environmental Chemistry", "Factores Clim\u00e1ticos", "https://purl.org/becyt/ford/1", "Biology", "Ecosystem", "0105 earth and related environmental sciences", "Soil science", "Soil organic matter", "Soil Fertility", "climat", "AVAILABILITY", "Nitrogen Dynamics", "15. Life on land", "Carbon", "Inorganic", "NITROGEN", "MODEL", "[SDE.MCG] Environmental Sciences/Global Changes", "13. Climate action", "FOS: Biological sciences", "Environmental Science", "PATTERNS", "0401 agriculture", " forestry", " and fisheries", "Soil Carbon Dynamics and Nutrient Cycling in Ecosystems"]}, "links": [{"href": "https://scholars.unh.edu/context/faculty_pubs/article/1042/viewcontent/srep08280.pdf"}, {"href": "https://edoc.unibas.ch/37215/1/srep08280.pdf"}, {"href": "https://doi.org/10.1038/srep08280"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Scientific%20Reports", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1038/srep08280", "name": "item", "description": "10.1038/srep08280", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1038/srep08280"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-02-06T00:00:00Z"}}, {"id": "10.3389/fmicb.2016.00525", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:20:15Z", "type": "Journal Article", "created": "2016-04-20", "title": "Belowground Response To Drought In A Tropical Forest Soil. I. Changes In Microbial Functional Potential And Metabolism", "description": "Global climate models predict a future of increased severity of drought in many tropical forests. Soil microbes are central to the balance of these systems as sources or sinks of atmospheric carbon (C), yet how they respond metabolically to drought is not well-understood. We simulated drought in the typically aseasonal Luquillo Experimental Forest, Puerto Rico, by intercepting precipitation falling through the forest canopy. This approach reduced soil moisture by 13% and water potential by 0.14 MPa (from -0.2 to -0.34). Previous results from this experiment have demonstrated that the diversity and composition of these soil microbial communities are sensitive to even small changes in soil water. Here, we show prolonged drought significantly alters the functional potential of the community and provokes a clear osmotic stress response, including the production of compatible solutes that increase intracellular C demand. Subsequently, a microbial population emerges with a greater capacity for extracellular enzyme production targeting macromolecular carbon. Significantly, some of these drought-induced functional shifts in the soil microbiota are attenuated by prior exposure to a short-term drought suggesting that acclimation may occur despite a lack of longer-term drought history.", "keywords": ["tropical forests", "0301 basic medicine", "2. Zero hunger", "570", "0303 health sciences", "Ecology", "Environmental Science and Management", "osmolytes", "drought", "Biological Sciences", "Medical microbiology", "15. Life on land", "551", "microbial ecology", "Microbiology", "QR1-502", "6. Clean water", "03 medical and health sciences", "13. Climate action", "Soil Sciences", "functional gene microarray"]}, "links": [{"href": "https://escholarship.org/content/qt5ts293tg/qt5ts293tg.pdf"}, {"href": "https://doi.org/10.3389/fmicb.2016.00525"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Frontiers%20in%20Microbiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3389/fmicb.2016.00525", "name": "item", "description": "10.3389/fmicb.2016.00525", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3389/fmicb.2016.00525"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-04-20T00:00:00Z"}}, {"id": "10.1098/rstb.2017.0302", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:14Z", "type": "Journal Article", "created": "2018-10-08", "title": "Tropical land carbon cycle responses to 2015/16 El Ni\u00f1o as recorded by atmospheric greenhouse gas and remote sensing data", "description": "The outstanding tropical land climate characteristic over the past decades is rapid warming, with no significant large-scale precipitation trends. This warming is expected to continue but the effects on tropical vegetation are unknown. El Ni\uffc3\uffb1o-related heat peaks may provide a test bed for a future hotter world. Here we analyse tropical land carbon cycle responses to the 2015/16 El Ni\uffc3\uffb1o heat and drought anomalies using an atmospheric transport inversion. Based on the global atmospheric CO 2 and fossil fuel emission records, we find no obvious signs of anomalously large carbon release compared with earlier El Ni\uffc3\uffb1o events, suggesting resilience of tropical vegetation. We find roughly equal net carbon release anomalies from Amazonia and tropical Africa, approximately 0.5 PgC each, and smaller carbon release anomalies from tropical East Asia and southern Africa. Atmospheric CO anomalies reveal substantial fire carbon release from tropical East Asia peaking in October 2015 while fires contribute only a minor amount to the Amazonian carbon flux anomaly. Anomalously large Amazonian carbon flux release is consistent with downregulation of primary productivity during peak negative near-surface water anomaly (October 2015 to March 2016) as diagnosed by solar-induced fluorescence. Finally, we find an unexpected anomalous positive flux to the atmosphere from tropical Africa early in 2016, coincident with substantial CO release.
This article is part of a discussion meeting issue \uffe2\uff80\uff98The impact of the 2015/2016 El Ni\uffc3\uffb1o on the terrestrial tropical carbon cycle: patterns, mechanisms and implications\uffe2\uff80\uff99.
", "keywords": ["Life Sciences & Biomedicine - Other Topics", "FLUX", "0301 basic medicine", "Hot Temperature", "550", "551", "global warming", "01 natural sciences", "Carbon Cycle", "Greenhouse Gases", "03 medical and health sciences", "[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/Climatology", "CHEMICAL-TRANSPORT MODEL", "carbon cycle", "INVERSION", "Biology", "TEMPERATURE", "11 Medical and Health Sciences", "0105 earth and related environmental sciences", "tropical forests", "El Nino-Southern Oscillation", "Evolutionary Biology", "Tropical Climate", "Science & Technology", "Atmosphere", "PHOTOSYNTHESIS", "EQUATORIAL PACIFIC", "Articles", "06 Biological Sciences", "15. Life on land", "[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces", " environment", "6. Clean water", "Droughts", "[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology", "13. Climate action", "PRECIPITATION", "Remote Sensing Technology", "INDUCED CHLOROPHYLL FLUORESCENCE", "CO2", "[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces", "SENSITIVITY", "environment", "Life Sciences & Biomedicine", "fire"]}, "links": [{"href": "https://eprints.whiterose.ac.uk/135234/8/Tropical%20land%20carbon%20cycle%20responses%20to%202015/16%20El%20Ni%C3%B1o%20as%20recorded%20by%20atmospheric%20greenhouse%20gas%20and%20remote%20sensing%20data.pdf"}, {"href": "https://royalsocietypublishing.org/doi/pdf/10.1098/rstb.2017.0302"}, {"href": "https://doi.org/10.1098/rstb.2017.0302"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Philosophical%20Transactions%20of%20the%20Royal%20Society%20B%3A%20Biological%20Sciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1098/rstb.2017.0302", "name": "item", "description": "10.1098/rstb.2017.0302", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1098/rstb.2017.0302"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-10-08T00:00:00Z"}}, {"id": "10.1111/1365-2745.12053", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:20Z", "type": "Journal Article", "created": "2013-05-10", "title": "Strong Congruence In Tree And Fern Community Turnover In Response To Soils And Climate In Central Panama", "description": "Summary
Plant species turnover in central Panamanian forests has been principally attributed to the effects of dispersal limitation and a strong Caribbean to Pacific gradient in rainfall seasonality. Despite marked geological heterogeneity, the role of soil variation has not been rigorously examined.
We modelled the compositional turnover of trees and ferns in the Panama Canal watershed as a function of soil chemistry, climate and geographical separation, using generalized dissimilarity models (GDMs).
Predictability in both plant groups was strong, with 74% of turnover explained in trees and 49% in ferns. Major trends in the two plant groups were strikingly similar. The independent effects of soils, and of climate for trees, were sizeable, but those of geographical distance were minor. In both plant groups, distance and climatic effects on species turnover covaried strongly.
Including floristic dissimilarity of the other taxon as a predictor increased explained deviance to 81% in trees and 59% in ferns. Controlling for differences in plant density among plots reduced deviance explained by climate and distance, while soil effects remained strong. Limiting the analyses to soils of volcanic origin increased deviance explained by climate, soils and distance, but their effects covaried strongly. Independent soil effects on tree turnover were reduced, but their effects on fern turnover remained pronounced.
Dry season length was the most important climatic predictor for both taxa, and P and pH were the most important soil predictors. Particularly, rapid species turnover was associated with the driest end of the seasonality gradient, linked to declining individual densities and species richness, and with the low end of the phosphorus gradient.
Synthesis. While changes in rainfall and seasonality undoubtedly limit plant distributions in this region, soil effects are at least as important, and interactions between the two are sizeable. This is likely to hold elsewhere in the Caribbean region, where mosaics of marine and volcanic soils combined with pronounced rainfall gradients are common. Strong congruence between our focal taxa suggests that our results can be extrapolated to other plant groups, particularly as trees and ferns are distantly related and represent different life\uffe2\uff80\uff90forms.
", "keywords": ["0106 biological sciences", "biotic interactions", " determinants of plant community diversity and structure", " edaphic variation", " environmental control", " matrix regression", " precipitation", " Pteridophyta", " seed and spore dispersal", " tropical forests", " turnover rates", "15. Life on land", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1111/1365-2745.12053"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/1365-2745.12053", "name": "item", "description": "10.1111/1365-2745.12053", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/1365-2745.12053"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-01-14T00:00:00Z"}}, {"id": "10.1111/1365-2435.12329", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:19Z", "type": "Journal Article", "created": "2014-09-05", "title": "Interactive Effects Of C, N And P Fertilization On Soil Microbial Community Structure And Function In An Amazonian Rain Forest", "description": "Summary
Resource control over abundance, structure and functional diversity of soil microbial communities is a key determinant of soil processes and related ecosystem functioning. Copiotrophic organisms tend to be found in environments which are rich in nutrients, particularly carbon, in contrast to oligotrophs, which survive in much lower carbon concentrations.
We hypothesized that microbial biomass, activity and community structure in nutrient\uffe2\uff80\uff90poor soils of an Amazonian rain forest are limited by multiple elements in interaction. We tested this hypothesis with a fertilization experiment by adding C (as cellulose), N (as urea) and P (as phosphate) in all possible combinations to a total of 40 plots of an undisturbed tropical forest in French Guiana.
After 2\uffc2\uffa0years of fertilization, we measured a 47% higher biomass, a 21% increase in substrate\uffe2\uff80\uff90induced respiration rate and a 5\uffe2\uff80\uff90fold higher rate of decomposition of cellulose paper discs of soil microbial communities that grew in P\uffe2\uff80\uff90fertilized plots compared to plots without P fertilization. These responses were amplified with a simultaneous C fertilization suggesting P and C colimitation of soil micro\uffe2\uff80\uff90organisms at our study site.
Moreover, P fertilization modified microbial community structure (PLFAs) to a more copiotrophic bacterial community indicated by a significant decrease in the Gram\uffe2\uff80\uff90positive\uffc2\uffa0:\uffc2\uffa0Gram\uffe2\uff80\uff90negative ratio. The Fungi\uffc2\uffa0:\uffc2\uffa0Bacteria ratio increased in N fertilized plots, suggesting that fungi are relatively more limited by N than bacteria. Changes in microbial community structure did not affect rates of general processes such as glucose mineralization and cellulose paper decomposition. In contrast, community level physiological profiles under P fertilization combined with either C or N fertilization or both differed strongly from all other treatments, indicating functionally different microbial communities.
While P appears to be the most critical from the three major elements we manipulated, the strongest effects were observed in combination with either supplementary C or N addition in support of multiple element control on soil microbial functioning and community structure.
We conclude that the soil microbial community in the studied tropical rain forest and the processes it drives is finely tuned by the relative availability in C, N and P. Any shifts in the relative abundance of these key elements may affect spatial and temporal heterogeneity in microbial community structure, their associated functions and the dynamics of C and nutrients in tropical ecosystems.
", "keywords": ["tropical forest", "2. Zero hunger", "570", "phospholipid fatty acids (PLFA)", "[SDE.MCG]Environmental Sciences/Global Changes", "functional significance", "[SDV.EE.IEO] Life Sciences [q-bio]/Ecology", " environment/Symbiosis", "04 agricultural and veterinary sciences", "15. Life on land", "16. Peace & justice", "[SDE.BE] Environmental Sciences/Biodiversity and Ecology", "[SDE.MCG] Environmental Sciences/Global Changes", "13. Climate action", "microbial community structure", "ecosystem functioning", "environment/Symbiosis", "[SDV.EE.ECO]Life Sciences [q-bio]/Ecology", "[SDV.EE.ECO] Life Sciences [q-bio]/Ecology", " environment/Ecosystems", "[SDV.EE.IEO]Life Sciences [q-bio]/Ecology", "0401 agriculture", " forestry", " and fisheries", "multiple resource limitation", "[SDE.BE]Environmental Sciences/Biodiversity and Ecology", "phosphorus", "environment/Ecosystems", "soil functioning"]}, "links": [{"href": "https://doi.org/10.1111/1365-2435.12329"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Functional%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/1365-2435.12329", "name": "item", "description": "10.1111/1365-2435.12329", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/1365-2435.12329"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2014-09-29T00:00:00Z"}}, {"id": "10.1111/1365-2435.12475", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:19Z", "type": "Journal Article", "created": "2015-05-12", "title": "Nitrogen Saturation In Humid Tropical Forests After 6years Of Nitrogen And Phosphorus Addition: Hypothesis Testing", "description": "Summary
Nitrogen (N) saturation hypothesis suggests that when an ecosystem reaches N\uffe2\uff80\uff90saturation, continued N input will cause increased N leaching, nitrous oxide (N2O) emission, and N mineralization and nitrification rates. It also suggests that a different element will become the main limiting factor when N saturation has been reached. Although this hypothesis has been tested in temperate forests, whether they can be directly applied to N\uffe2\uff80\uff90saturated tropical forests remain poorly addressed.
To test this hypothesis, soil inorganic N, soil N mineralization and nitrification rate, soil N2O emission rate and nitrate () leaching rate were measured in an N\uffe2\uff80\uff90saturated old\uffe2\uff80\uff90growth tropical forest in southern China, after 6\uffc2\uffa0years of N and P addition. We hypothesized that N addition would stimulate further N saturation, but P addition might alleviate N saturation.
As expected, our results showed that six continuous years of experimental N addition did cause further N saturation, which was indicated by significant increases in soil inorganic N concentration, N2O emission and nitrate () leaching. However, in contrast to our expectations, N addition significantly decreased in\uffc2\uffa0situ rates of net N mineralization and nitrification, which could be related to associated changes in enzyme activity and microbial community composition. On the other hand, P addition mitigated N saturation, as expected. Soil inorganic N concentration, N2O emission and leaching decreased significantly after P addition, but the net rates of N mineralization and nitrification were significantly increased.
Our results provide a new understanding of the N saturation hypothesis, suggesting that the effects of long\uffe2\uff80\uff90term N deposition on net N mineralization and nitrification rates in N\uffe2\uff80\uff90saturated tropical forests can be negative and that P addition can alleviate N saturation in such tropical systems.
", "keywords": ["China", "Nitrogen mineralization and nitrification", "Tropical forest", "Nitrogen saturation", "13. Climate action", "Phosphorus addition", "0401 agriculture", " forestry", " and fisheries", "N 2 O emission", "04 agricultural and veterinary sciences", "15. Life on land", "Nitrogen deposition"]}, "links": [{"href": "https://doi.org/10.1111/1365-2435.12475"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Functional%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/1365-2435.12475", "name": "item", "description": "10.1111/1365-2435.12475", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/1365-2435.12475"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-06-06T00:00:00Z"}}, {"id": "10.1111/j.1365-2745.2010.01680.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:38Z", "type": "Journal Article", "created": "2010-05-27", "title": "Experimental Investigation Of The Importance Of Litterfall In Lowland Semi-Evergreen Tropical Forest Nutrient Cycling", "description": "Summary1.\uffe2\uff80\uff82The cycling of nutrients in litterfall is considered a key mechanism in the maintenance of tropical forest fertility but its importance has rarely been quantified experimentally.
2.\uffe2\uff80\uff82We carried out a long\uffe2\uff80\uff90term (5\uffe2\uff80\uff83years), large\uffe2\uff80\uff90scale litter manipulation experiment in lowland semi\uffe2\uff80\uff90evergreen tropical forest to determine how changes in litterfall affect forest nutrient cycling. We hypothesized that: (i) long\uffe2\uff80\uff90term litter removal would decrease the forest\uffe2\uff80\uff99s nutrient supply; (ii) litter addition would increase the forest\uffe2\uff80\uff99s nutrient supply; (iii) soil and foliar nutrient concentrations would change in response to litter manipulation and would eventually affect above\uffe2\uff80\uff90ground productivity.
3.\uffe2\uff80\uff82To test our hypotheses, we measured trunk growth, litterfall, and nutrient concentrations in live leaves, litter and soil in plots where litter was removed once a month (L\uffe2\uff88\uff92), litter was added once a month (L+) and controls (CT).
4.\uffe2\uff80\uff82After 5\uffe2\uff80\uff83years, the concentration of nitrate in the soil and soil stocks of inorganic nitrogen were higher in the L+ plots and lower in the L\uffe2\uff88\uff92 plots compared to the controls. Ammonium concentrations in the soil were also lower in the L\uffe2\uff88\uff92 plots. Nitrogen in leaves and litter and the annual nitrogen return by litter were higher in the L+ plots, while potassium return was lower in the L\uffe2\uff88\uff92 plots. Surprisingly, our treatments had little effect on phosphorus in soil, leaves or litter, even though lowland tropical forests are generally thought to be largely phosphorus limited.
5.\uffe2\uff80\uff82Trunk growth of large trees was not affected by litter manipulation but rainy season litterfall from 2003 to 2008 was 13% higher in the L+ plots compared to the controls.
6.\uffe2\uff80\uff82Synthesis. Litter removal affected forest nutrient cycling and productivity less than expected, probably because the soil at our site is moderately fertile. However, litter addition increased litterfall indicating that some limitation of forest production was removed by litter addition. We expected strong effects of litter manipulation on phosphorus cycling; instead, we found a stronger effect on nitrogen cycling. Our results suggest that litter is an important source of nutrients, in particular nitrogen, to trees in this lowland semi\uffe2\uff80\uff90evergreen tropical forest.
", "keywords": ["tropical forest", "0106 biological sciences", "2. Zero hunger", "nutrient limitation", "potassium", "litterfall seasonality", "15. Life on land", "01 natural sciences", "nitrogen", "litter removal", "foliar nutrients", "litter manipulation", "soil nutrients", "phosphorus", "litterfall", "litter addition"]}, "links": [{"href": "https://doi.org/10.1111/j.1365-2745.2010.01680.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1365-2745.2010.01680.x", "name": "item", "description": "10.1111/j.1365-2745.2010.01680.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1365-2745.2010.01680.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-08-04T00:00:00Z"}}, {"id": "10.1111/gcb.14878", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:27Z", "type": "Journal Article", "created": "2019-10-22", "title": "Which practices co\u2010deliver food security, climate change mitigation and adaptation, and combat land degradation and desertification?", "description": "AbstractThere is a clear need for transformative change in the land management and food production sectors to address the global land challenges of climate change mitigation, climate change adaptation, combatting land degradation and desertification, and delivering food security (referred to hereafter as \uffe2\uff80\uff9cland challenges\uffe2\uff80\uff9d). We assess the potential for 40 practices to address these land challenges and find that: Nine options deliver medium to large benefits for all four land challenges. A further two options have no global estimates for adaptation, but have medium to large benefits for all other land challenges. Five options have large mitigation potential (>3\uffc2\uffa0Gt CO2eq/year) without adverse impacts on the other land challenges. Five options have moderate mitigation potential, with no adverse impacts on the other land challenges. Sixteen practices have large adaptation potential (>25 million people benefit), without adverse side effects on other land challenges. Most practices can be applied without competing for available land. However, seven options could result in competition for land. A large number of practices do not require dedicated land, including several land management options, all value chain options, and all risk management options. Four options could greatly increase competition for land if applied at a large scale, though the impact is scale and context specific, highlighting the need for safeguards to ensure that expansion of land for mitigation does not impact natural systems and food security. A number of practices, such as increased food productivity, dietary change and reduced food loss and waste, can reduce demand for land conversion, thereby potentially freeing\uffe2\uff80\uff90up land and creating opportunities for enhanced implementation of other practices, making them important components of portfolios of practices to address the combined land challenges.South China has been experiencing very high rate of acid deposition and severe soil acidification in recent decades, which has been proposed to exacerbate the regional ecosystem phosphorus (P) limitation. We conducted a 10\uffe2\uff80\uff90year field experiment of simulated acid deposition to examine how acidification impacts seasonal changes of different soil P fractions in a tropical forest with highly acidic soils in south China. As expected, acid addition significantly increased occluded P pool but reduced the other more labile P pools in the dry season. In the wet season, however, acid addition did not change microbial P, soluble P and labile organic P pools. Acid addition significantly increased exchangeable Al3+ and Fe3+ and the activation of Fe oxides in both seasons. Different from the decline of microbial abundance in the dry season, acid addition increased ectomycorrhizal fungi and its ratio to arbuscular mycorrhiza fungi in the wet season, which significantly stimulated phosphomonoesterase activities and likely promoted the dissolution of occluded P. Our results suggest that, even in already highly acidic soils, the acidification\uffe2\uff80\uff90induced P limitation could be alleviated by stimulating ectomycorrhizal fungi and phosphomonoesterase activities. The differential responses and microbial controls of seasonal soil P transformation revealed here should be implemented into ecosystem biogeochemical model for predicting plant productivity under future acid deposition scenarios. 1.\uffe2\uff80\uff82The Amazon region may experience increasing moisture limitation over this century. Leaf dark respiration (R) is a key component of the Amazon rain forest carbon (C) cycle, but relatively little is known about its sensitivity to drought.
2.\uffe2\uff80\uff82Here, we present measurements of R standardized to 25\uffe2\uff80\uff83\uffc2\uffb0C and leaf morphology from different canopy heights over 5\uffe2\uff80\uff83years at a rain forest subject to a large\uffe2\uff80\uff90scale through\uffe2\uff80\uff90fall reduction (TFR) experiment, and nearby, unmodified Control forest, at the Caxiuan\uffc3\uffa3 reserve in the eastern Amazon.
3.\uffe2\uff80\uff82In all five post\uffe2\uff80\uff90treatment measurement campaigns, mean R at 25\uffe2\uff80\uff83\uffc2\uffb0C was elevated in the TFR forest compared to the Control forest experiencing normal rainfall. After 5\uffe2\uff80\uff83years of the TFR treatment, R per unit leaf area and mass had increased by 65% and 42%, respectively, relative to pre\uffe2\uff80\uff90treatment means. In contrast, leaf area index (L) in the TFR forest was consistently lower than the Control, falling by 23% compared to the pre\uffe2\uff80\uff90treatment mean, largely because of a decline in specific leaf area (S).
4.\uffe2\uff80\uff82The consistent and significant effects of the TFR treatment on R, L and S suggest that severe drought events in the Amazon, of the kind that may occur more frequently in future, could cause a substantial increase in canopy carbon dioxide emissions from this ecosystem to the atmosphere.
", "keywords": ["tropical forest", "0301 basic medicine", "Through-fall exclusion experiment", "moisture transfer", "03 medical and health sciences", "Specific leaf area", "Amazonia", "Tropical forest", "Keywords: carbon cycle", "Climate change", "Para [Brazil] Climate change", "Caxiuana National Forest", "0303 health sciences", "leaf area index", "Night-time foliar carbon emissions", "exclusion experiment", "15. Life on land", "6. Clean water", "Leaf dark respiration", "forest canopy", "Moisture deficit", "climate change", "13. Climate action", "Leaf area index", "carbon emission", "throughfall", "rainforest", "Brazil"]}, "links": [{"href": "https://openresearch-repository.anu.edu.au/bitstream/1885/79379/5/f5625xPUB7833.pdf.jpg"}, {"href": "https://openresearch-repository.anu.edu.au/bitstream/1885/79379/7/01_Metcalfe_Impacts_of_experimentally_2010.pdf.jpg"}, {"href": "https://doi.org/10.1111/j.1365-2435.2009.01683.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Functional%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1365-2435.2009.01683.x", "name": "item", "description": "10.1111/j.1365-2435.2009.01683.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1365-2435.2009.01683.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-04-08T00:00:00Z"}}, {"id": "10.1371/journal.pone.0070224", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:19:08Z", "type": "Journal Article", "created": "2013-07-16", "title": "Effects Of Added Organic Matter And Water On Soil Carbon Sequestration In An Arid Region", "description": "Open AccessEn general, se predice que el calentamiento global estimular\u00e1 la producci\u00f3n primaria y conducir\u00e1 a m\u00e1s aportes de carbono (C) al suelo. Sin embargo, muchos estudios han encontrado que el suelo C no necesariamente aumenta con el aumento de la entrada de basura vegetal. Las precipitaciones han aumentado en Asia central \u00e1rida y se prev\u00e9 que aumenten m\u00e1s, por lo que probamos los efectos de la adici\u00f3n de materia org\u00e1nica fresca (FOM) y agua en el secuestro de C del suelo en una regi\u00f3n \u00e1rida en el noroeste de China. Los resultados sugirieron que el FOM a\u00f1adido se descompuso r\u00e1pidamente y tuvo efectos menores en el dep\u00f3sito de carbono org\u00e1nico del suelo (SOC) a una profundidad de 30 cm. Tanto la FOM como la adici\u00f3n de agua tuvieron efectos significativos en la biomasa microbiana del suelo. La biomasa microbiana del suelo aument\u00f3 con la adici\u00f3n de FOM, alcanz\u00f3 un m\u00e1ximo y luego disminuy\u00f3 a medida que la FOM se descompon\u00eda. El FOM tuvo un efecto estimulante m\u00e1s significativo sobre la biomasa microbiana con la adici\u00f3n de agua. Bajo los rangos de humedad del suelo utilizados en este experimento (21.0% -29.7%), el aporte de FOM fue m\u00e1s importante que la adici\u00f3n de agua en el proceso de mineralizaci\u00f3n del suelo C. Concluimos que la entrada de FOM a corto plazo en el suelo subterr\u00e1neo y la adici\u00f3n de agua no afectan la piscina de SOC en los matorrales en una regi\u00f3n \u00e1rida.", "keywords": ["Carbon sequestration", "550", "Arid", "Growth", "630", "Agricultural and Biological Sciences", "Soil", "Agricultural soil science", "Tropical forest", "Soil water", "Carbon fibers", "Biomass", "Land-use", "2. Zero hunger", "Analysis of Land Cover and Ecosystems", "Ecology", "Respiration", "Q", "Temperature", "R", "Soil Chemical Properties", "Life Sciences", "Composite number", "04 agricultural and veterinary sciences", "Soil carbon", "6. Clean water", "Chemistry", "Physical Sciences", "Environmental chemistry", "Medicine", "Organic matter", "Research Article", "Composite material", "Carbon Sequestration", "China", "Desert shrubs", "Science", "Soil Science", "Ecosystems", "Environmental science", "Meta-analysis in Ecology and Agriculture Research", "Organic Matter Dynamics", "Climate-change", "Soil Carbon Sequestration", "Biology", "Ecology", " Evolution", " Behavior and Systematics", "Soil science", "Soil organic matter", "Soil Fertility", "Water", "Soil Properties", "15. Life on land", "Soil biodiversity", "Materials science", "Microbial activity", "Carbon dioxide", "13. Climate action", "FOS: Biological sciences", "Environmental Science", "Fine-root", "0401 agriculture", " forestry", " and fisheries", "Soil Carbon Dynamics and Nutrient Cycling in Ecosystems", "CO2 flux"]}, "links": [{"href": "https://doi.org/10.1371/journal.pone.0070224"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/PLoS%20ONE", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1371/journal.pone.0070224", "name": "item", "description": "10.1371/journal.pone.0070224", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1371/journal.pone.0070224"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-07-16T00:00:00Z"}}, {"id": "10.1111/nph.20401", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:18:48Z", "type": "Journal Article", "created": "2025-01-17", "title": "Insights into the subdaily variations in methane, nitrous oxide and carbon dioxide fluxes from upland tropical tree stems", "description": "Summary
Recent studies have shown that stem fluxes, although highly variable among trees, can alter the strength of the methane (CH4) sink or nitrous oxide (N2O) source in some forests, but the patterns and magnitudes of these fluxes remain unclear. This study investigated the drivers of subdaily and seasonal variations in stem and soil CH4, N2O and carbon dioxide (CO2) fluxes.
CH4, N2O and CO2 fluxes were measured continuously for 19\uffe2\uff80\uff89months in individual stems of two tree species, Eperua falcata (Aubl.) and Lecythis poiteaui (O. Berg), and surrounding soils using an automated chamber system in an upland tropical forest. Subdaily variations in these fluxes were related to environmental and stem physiological (sap flow and stem diameter variations) measurements under contrasting soil water conditions.
The results showed that physiological and climatic drivers only partially explained the subdaily flux variations. Stem CH4 and CO2 emissions and N2O uptake varied with soil water content, time of day and between individuals. Stem fluxes decoupled from soil fluxes.
Our study contributes to understanding the regulation of stem greenhouse gas fluxes. It suggests that additional variables (e.g. internal gas concentrations, wood\uffe2\uff80\uff90colonising microorganisms, wood density and anatomy) may account for the remaining unexplained variability in stem fluxes, highlighting the need for further studies.
Nitrogen-induced suppression of lignin-modifying enzyme activity contributes to soil carbon sequestration.", "keywords": ["CHANGING ENVIRONMENT", "570", "550", "Nitrogen", "LITTER DECOMPOSITION", "Soil", "Bacterial Proteins", "Research Articles", "Ecosystem", "Soil Microbiology", "2. Zero hunger", "Science & Technology", "Bacteria", "HETEROTROPHIC ACTIVITY", "04 agricultural and veterinary sciences", "15. Life on land", "Carbon", "Enzymes", "N DEPOSITION", "Multidisciplinary Sciences", "ORGANIC-MATTER", "BIOCHEMICAL-COMPOSITION", "TEMPERATE FOREST", "13. Climate action", "SUBTROPICAL FORESTS", "Science & Technology - Other Topics", "0401 agriculture", " forestry", " and fisheries", "ATMOSPHERIC NITRATE DEPOSITION", "SIZE FRACTIONS", "CBIO"]}, "links": [{"href": "https://doi.org/10.1126/sciadv.aaq1689"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20Advances", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1126/sciadv.aaq1689", "name": "item", "description": "10.1126/sciadv.aaq1689", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1126/sciadv.aaq1689"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-08-03T00:00:00Z"}}, {"id": "10.1659/mrd.00007", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:19:25Z", "type": "Journal Article", "created": "2009-12-11", "title": "The Hydrology Of Tropical Andean Ecosystems: Importance, Knowledge Status, And Perspectives", "description": "Open AccessCet article met en \u00e9vidence la valeur \u00e9conomique et \u00e9cologique des syst\u00e8mes de ressources en eau de la r\u00e9gion foresti\u00e8re de p\u00e1ramo et de montagne de l'\u00c9quateur et donne une description, bas\u00e9e sur une enqu\u00eate de la litt\u00e9rature r\u00e9cente, des m\u00e9canismes contr\u00f4lant le processus de ruissellement des pr\u00e9cipitations et de la fa\u00e7on dont les changements dans l'utilisation des terres modifient la transformation. L'examen r\u00e9v\u00e8le que la compr\u00e9hension disponible est partielle, le r\u00e9sultat d'efforts de recherche individuels et isol\u00e9s, et est entrav\u00e9e par un manque d'ensembles de donn\u00e9es complets et coh\u00e9rents \u00e0 long terme. Les connaissances disponibles ne permettent pas encore d'augmenter ou de r\u00e9duire l'\u00e9chelle des r\u00e9sultats. L'article conclut en (1) citant certaines des principales lacunes qui entravent la compr\u00e9hension hydrologique des \u00e9cosyst\u00e8mes andins tropicaux et (2) proposant des recommandations pour acc\u00e9l\u00e9rer la compr\u00e9hension et l'\u00e9laboration de politiques et de mesures visant \u00e0 garantir un d\u00e9veloppement \u00e9cologiquement s\u00fbr et durable des \u00e9cosyst\u00e8mes aquatiques fragiles de la r\u00e9gion andine tropicale de l'\u00c9quateur.", "keywords": ["Resource (disambiguation)", "0207 environmental engineering", "Optimal Operation of Water Resources Systems", "Ocean Engineering", "02 engineering and technology", "Environmental science", "Engineering", "Tropical forest", "Downscaling", "Climate change", "Hydro-Economic Models", "Environmental resource management", "Biology", "Ecosystem", "Water Science and Technology", "Computer network", "Geography", "Ecology", "15. Life on land", "Computer science", "6. Clean water", "Hydrological Modeling and Water Resource Management", "13. Climate action", "FOS: Biological sciences", "Environmental Science", "Physical Sciences"]}, "links": [{"href": "https://doi.org/10.1659/mrd.00007"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Mountain%20Research%20and%20Development", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1659/mrd.00007", "name": "item", "description": "10.1659/mrd.00007", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1659/mrd.00007"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-11-01T00:00:00Z"}}, {"id": "10.5061/dryad.k6djh9wdx", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:20:59Z", "type": "Dataset", "created": "2024-01-30", "title": "Fluxes and concentrations of dissolved organic carbon in soils", "description": "unspecifiedThe data were compiled from data in our study and those from published sources by searching for \u201cdissolved organic carbon\u201d, \u201csolute\u201d, \u201cflux\u201d, \u201cleaching\u201d, and \u201csoil\u201d in Google Scholar. We compiled the data of DOC fluxes in throughfall and soil profiles from 91 sites, of which the DOC flux data at 18 sites have been published by our group. The climate was classified into four groups [polar climate (MAT < 0 \u00baC), boreal climate (0 \u00baC < MAT < 6 \u00baC), temperate climate (6 \u00baC < MAT < 20 \u00baC), tropical climate (20 \u00baC < MAT)], based on mean annual air temperature. The other parameters include climatic properties [mean annual precipitation and mean annual air temperature], plant litter properties [litterfall C input, C/N ratio, Klason-lignin (residue after digestion with sulfuric acid; Allen et al., 1974), lignin/N ratio, root litter production] and soil properties [soil C stocks (O horizon and mineral soil (0-30 cm depth)), pH (water extraction), clay content, short-range-order (amorphous) aluminum (Al), iron (Fe) (acid ammonium oxalate extractable Al and Fe; McKeague and Day, 1966)]. The sampling and analytical methods are concisely summarized as follows: Throughfall (canopy leaching) samples were collected by precipitation collector, while soil solution samples were collected using tension-free lysimeters for downward flux of water percolating in the soil profiles. Sample solutions were filtered through a 0.45 \u00b5m filter (e.g., PTFE syringe filter) and stored at 1\u00b0C in the dark prior to analyses. The concentrations of DOC were determined using a total organic carbon and nitrogen analyzer (TOC-VCSH, Shimadzu, Japan). The dissolved organic nitrogen (DON) concentrations were calculated by subtracting dissolved inorganic nitrogen (sum of NH4+ and NO3-) from TDN concentrations (DON = TDN - NH4+ - NO3-) to obtain DOC/DON ratios in soil solution. The DOC flux at the depth of 0 cm (the bottom of organic layers) and the bottom of B horizon (the bottom of rooting zone) was estimated by multiplying DOC concentrations in soil solution and water fluxes at each depth. Soil water fluxes were estimated by hydrological models or precipitation-evapotranspiration water budgets. Annual root production was measured by ingrowth core method, net sheet method, or sequential sampling method and estimated to be equal to annual root litter inputs. Proportion of DOC flux from the O horizon relative to C input via both throughfall and litterfall was calculated by dividing DOC flux from the O horizon by C input via both throughfall and litterfall. DOC retention in the mineral soil was calculated as the percentage of net decrease in DOC flux between O and B horizons relative to DOC flux from the O horizon. The apparent turnover time (yr) of soil C was estimated by dividing soil C stocks (Mg C ha\u20131) by C inputs (net DOC inputs and root litter inputs into the mineral soil) (Mg C ha\u20131 yr\u20131).", "keywords": ["tropical forest", "FOS: Earth and related environmental sciences", "Soil pH", "dissolved organic carbon", "dissolved organic nitrogen"], "contacts": [{"organization": "Fujii, Kazumichi", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.k6djh9wdx"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.k6djh9wdx", "name": "item", "description": "10.5061/dryad.k6djh9wdx", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.k6djh9wdx"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-02-19T00:00:00Z"}}, {"id": "10.2136/sssaj2007.0375", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:19:54Z", "type": "Journal Article", "created": "2008-10-01", "title": "Soil Organic Matter Quality Under Different Land Uses In A Mountain Watershed Of Nepal", "description": "Land use change is one of the anthropogenic interventions that may induce substantial modifications to both the quantity and quality of soil organic matter (SOM). Soils from three cultivated areas (two types of rainfed upland and one irrigated lowland) and two forests (subtropical managed and temperate unmanaged) in a midhill watershed of Nepal were studied to assess the effect of land use change on SOM quality. Bulk SOM was analyzed using solid\uffe2\uff80\uff90state13C nuclear magnetic resonance (NMR) and fractionated by acid hydrolysis into pools with different chemical composition and, thus, different tendencies to decomposition. The NMR analysis showed a clear prevalence of O\uffe2\uff80\uff90alkyl C over alkyl C and aromatic C, with major differences between both soils and two depth intervals of the same soil (0\uffe2\uff80\uff9320 and 20\uffe2\uff80\uff9340 cm). Acid hydrolysis revealed that the labile C pool is larger in the 0\uffe2\uff80\uff90 to 20\uffe2\uff80\uff90 than the 20\uffe2\uff80\uff90 to 40\uffe2\uff80\uff90cm soil depth of each land use. Labile C was larger in the temperate unmanaged forest and the irrigated cultivated land than in the other soils at both soil depths. Of the cultivated rainfed soils, the recently reclaimed soil contained less labile C than the historically cultivated soil, while the labile C in the irrigated soil exceeded that in both rainfed soils. The results suggest that changes in land use from forest to cultivation and the irrigation of the cultivated land may significantly affect not only the quantity but also the quality of the SOM and, more importantly, its chemical recalcitrance to degradation. As a consequence, any future decisions regarding land management in the fragile mountain areas of Nepal should be carefully considered with respect to the nature of the SOM.
", "keywords": ["2. Zero hunger", "13. Climate action", "15. Life on land", "C-13 NMR", " TROPICAL FOREST", " SIZE FRACTIONS", " MIDDLE HILLS", " LEAF-LITTER", " CARBON", " DYNAMICS", " DEGRADATION", " PARTICLE", " DECOMPOSITION.", "6. Clean water", "NMR; soil quality"]}, "links": [{"href": "https://doi.org/10.2136/sssaj2007.0375"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Science%20Society%20of%20America%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2136/sssaj2007.0375", "name": "item", "description": "10.2136/sssaj2007.0375", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2136/sssaj2007.0375"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2008-11-01T00:00:00Z"}}, {"id": "10.3389/fmicb.2021.676251", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:20:16Z", "type": "Journal Article", "created": "2021-06-07", "title": "Dynamics of Soil Bacterial and Fungal Communities During the Secondary Succession Following Swidden Agriculture IN Lowland Forests", "description": "Elucidating dynamics of soil microbial communities after disturbance is crucial for understanding ecosystem restoration and sustainability. However, despite the widespread practice of swidden agriculture in tropical forests, knowledge about microbial community succession in this system is limited. Here, amplicon sequencing was used to investigate effects of soil ages (spanning at least 60 years) after disturbance, geographic distance (from 0.1 to 10 km) and edaphic property gradients (soil pH, conductivity, C, N, P, Ca, Mg, and K), on soil bacterial and fungal communities along a chronosequence of sites representing the spontaneous succession following swidden agriculture in lowland forests in Papua New Guinea. During succession, bacterial communities (OTU level) as well as its abundant (OTU with relative abundance > 0.5%) and rare (<0.05%) subcommunities, showed less variation but more stage-dependent patterns than those of fungi. Fungal community dynamics were significantly associated only with geographic distance, whereas bacterial community dynamics were significantly associated with edaphic factors and geographic distance. During succession, more OTUs were consistently abundant (n = 12) or rare (n = 653) for bacteria than fungi (abundant = 6, rare = 5), indicating bacteria were more tolerant than fungi to environmental gradients. Rare taxa showed higher successional dynamics than abundant taxa, and rare bacteria (mainly from Actinobacteria, Proteobacteria, Acidobacteria, and Verrucomicrobia) largely accounted for bacterial community development and niche differentiation during succession.Site description Soils were sampled from the Bisley Experimental Watershed of the LEF, Puerto Rico (18.3157 deg. N, 65.7487 deg W), a Long-Term Ecological Research and Critical Zone Observatory and Network site (https://luq.lter.network). The mean maximum daily temperature at Bisley was 27 \u00baC between 1993 and 2010 (Gonzales, 2020), with little seasonality. The mean annual precipitation at Bisley was 3883 (\u00b1 864 s.d.) mm y-1 from 1988 through 2014 (Gonz\u00e1lez, 2017; Murphy et al., 2017). Rainfall occurs all year, though January through April experience slightly less precipitation than other months (Heartsill-Scalley et al., 2007). The site is a humid tropical forest with a diverse tree community of approximately 170 species > 4 cm diameter at breast height (Weaver & Murphy, 1990), and dominated by tabonuco (Dacryodes excelsa Vahl). Elevation of Bisley spans from 261 m a.s.l. at the base to 450 m a.s.l. on the ridges (Scatena, 1989). Soils in Bisley are derived from volcaniclastic sediments of andesitic parent material (Scatena, 1989).\u00a0 Ridge soils are classified as Ultisols (Typic Haplohumults), while slope soils are classified as Oxisols (inceptic and Aquic Hapludox), and valley soils are classified as Inceptisols (Typic Epiaquaepts) (Hall et al., 2015; McDowell et al., 2012; Scatena, 1989). Detailed site descriptions can be found in Scatena (1989), Heartsill-Scalley et al (2010), and McDowell et al (2012). Here we refer to soil organic C (SOC) and soil C interchangeably because there is no detectable inorganic C in these soils. Hurricane occurrence\u00a0 Figure 1: Timeline of major hurricanes that have affected Luquillo Experimental Forest between sampling dates. Nine major hurricanes (category 3 or higher) have impacted Puerto Rico between 1851 and 2019 (L\u00f3pez-Marrero et al., 2019), and five of these hurricanes have impacted the LEF. Until 1998, hurricanes had historically directly impacted the LEF approximately every 60 years (Scatena & Larsen, 1991). Before the initial sampling campaign of this study, Hurricane San Cipri\u00e1n in 1932 was the most recent storm to cause major disturbance to the LEF (Scatena & Larsen, 1991).\u00a0 However, since sampling in 1988, four major hurricanes have impacted the forest (Figure 1). Hurricane Hugo (Category 3-4) in 1989, Hurricane Georges (Category 3) in 1998, and Hurricanes Irma and Maria (Categories 5 and 4, respectively) within two weeks in 2017. The trajectory and windspeeds of all these hurricanes caused widespread defoliation. Litterfall historically takes over five years to return to pre-hurricane levels (Scatena et al., 1996).\u00a0 Sampling Sample collection occurred in 1988 and again in 2018. In both years, samples were collected from three depths: 0\u201310 cm (the A horizon), 10\u201335 cm (all of the B1 horizon and part of B2), and 35\u201360 cm (B2 to C) using an 8 cm diameter soil auger. Soils in this study were sampled at three separate sites at least 40 m from one another for each of three topographic locations, ridge, slope, and upland valley. Two separate cores were taken from a fourth topographic location in the riparian valley, that characterized a smaller proportion of the area of these watersheds (Scatena & Lugo, 1995). Riparian valley sites were ephemeral streambeds with a high boulder presence that limited sampling to less than 25 cm depth in one case. Sampling sites from 1988 were marked with flags, and samples from 2018 were collected from within 15 m of the same locations as the replicates from 1988, for consistency. Samples collected in 1988 were analyzed for bulk density, pH, soil moisture, and a suite of soil chemical properties (see Silver et al. 1994). Samples were then air-dried and stored in closed Ziploc bags within paper bags in a storage facility in Richmond, CA, USA before density fractionation in 2018. Fresh samples collected in 2018 were also characterized for pH, soil moisture, and soil chemistry. Approximately 3 g subsamples from each fresh sample in 2018 were immediately extracted with 45 mL of 0.2 M sodium citrate/0.5 M ascorbate solution, shaken for 16 hours, then centrifuged and the supernatant decanted to measure concentrations of poorly crystalline iron (Fe) oxides. Within two days of being double-bagged in Ziploc bags, fresh samples were further subsampled and analyzed for pH in a 1:1 soil-to-water slurry (Thomas, 1996) and for gravimetric soil moisture by oven-drying ~10 g subsamples at 105 \u00baC until a constant weight. Soil samples were air-dried before further processing and analysis. Air-dried soils from both sampling years were sieved to 2 mm and large roots were sorted out. Soil Density fractionation Soil was fractionated by density following the method of Swanston et al. (2005), as modified by Marin-Spiotta et al., (2009). Approximately 20 g of air-dried soil was added to centrifuge tubes. Sodium polytungstate (SPT, Na6 [H2W12O40] TC-Tungsten Compounds, Bavaria, Germany) in solution of density 1.85 g cm-3 was added to centrifuge tubes and agitated before centrifuging. The density of the SPT followed previous studies from this and nearby sites to allow direct comparison (Guti\u00e9rrez del Arroyo & Silver, 2018; Hall et al., 2015). Particulate organic matter floating at the surface after centrifugation, the free light fraction (FLF), was aspirated and then rinsed with 100 ml of deionized water 5 times on a 0.8 \u00b5m pore polycarbonate filter (Whatman Nuclepore Track Etch Membrane, Darmstadt, Germany). Rinsed FLF was oven-dried at 65 \u00baC until weight had stabilized. The remainder of the sample was combined with 70 ml of additional SPT and mixed using an electric benchtop mixer (G3U05R, Lightning, New York, NY, USA) at 1700 rpm for 1 min and sonicated in an ice bath for 3 min at 70% pulse (Branson 450 Sonifier, Danbury, CT, USA). Sonication is intended to disrupt soil structure and liberate organic matter that has been occluded in aggregates. The sonicated slurry was centrifuged again, and the light fraction at the surface, the occluded light fraction (OLF), was aspirated, rinsed, and dried using the same method as for the FLF. The remaining soil pellet was considered the heavy fraction (HF), or mineral-associated organic matter fraction. The HF was rinsed by thoroughly mixing with 150 ml of deionized water in the centrifuge tube, centrifuging, and removing the supernatant repeatedly until the fraction had been rinsed 5 times. The rinsed HF was oven-dried at 105 \u00baC until weight stabilized. The average mass recovery was 98%. Soil C and N and \u03b413C Dried bulk and HF soils were homogenized separately using a Spex Ball mill (SPEX Sample Prep Mixer Mill 8000D, Metuchen, NJ). The FLF and OLF were homogenized separately by hand using a mortar and pestle. All homogenized samples were then analyzed at U. C. Berkeley for C and N concentrations on the CE Elantech elemental analyzer (Lakewood, NJ) and for \u03b413C in the Stable Isotope Laboratory at UC Berkeley, using a CHNOS Elemental Analyzer interfaced to an IsoPrime 100 mass spectrometer (Cheadle Hulme, UK), with a long-term external precision of 0.10 %. \u00a0Soil C stocks were calculated by multiplying the C concentrations (%) by the oven-dry mass of bulk soil (< 2 mm) and dividing by depth and the bulk density as measured in 1988 (Silver et al., 1994; Throop et al., 2012). Radiocarbon Homogenized soil samples were combusted to CO2 in sealed glass tubes along with silver (Ag) and copper oxide (CuO) at the Center for Accelerator Mass Spectrometry at Lawrence Livermore National Lab. The CO2 was then graphitized on Fe powder under pressurized hydrogen gas (Vogel et al., 1984). Graphite was pressed into aluminum targets and run on the Compact Accelerator Mass Spectrometer for radiocarbon analysis (Broek et al., 2021). Radiocarbon is reported in \u039414C, following Stuiver & Polach (1977), and calculated based on the fraction of modern isotope composition, corrected for the year of sampling, and corrected for mass-dependent fractionation with observed \u03b413C values of the sample. The compact AMS had an average \u039414C precision of 3.2 %. We report the corrected \u039414C value and \u0394\u039414C, which is calculated as \u039414C of the sample minus \u039414C of the atmosphere, to account for rapidly changing atmospheric \u039414C during the study period. Atmospheric radiocarbon has been decaying nonlinearly since the peak of weapons testing in the 1950s. Radiocarbon signatures in the soil are strongly influenced by the atmospheric D14C signature, making them useful for modeling soil C age and transit time, especially since the 1950s. To compare the contribution of modern C between 1988 and 2018, it is useful to take the difference between soil and atmospheric D14C values, or DD14C, because atmospheric D14C declined between 1988 (98 %) and 2018 (4.4 %) in Northern Hemisphere Zone 2 (Hua et al., 2013). We note that the decline in atmospheric D14C is nonlinear, and thus the DD14C in 2018 soil will be less sensitive to short-term shifts in D14C inputs than the samples from 1988. Carbon age and transit time modeling Transit times and ages of C were modeled with the package \u201cSoilR\u201d (Sierra et al., 2012, 2014) in R, version 4.0.2. The change in C density fractions over time, termed C flow, was modeled using a 3-pool structure with a series flow matrix, under the simplifying assumption that C flows from the litter pool to the FLF, where it is sequentially transferred into the OLF and HF pools (Figure 2). The model structure is depicted in basic form in equation 1, \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (1)\u00a0 dC(t)/dt = Inputs - k*C \u00a0in matrix form with explicit pools in equation 2, \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2)\u00a0 dC(t)/dt = [Litter Inputs; 0; 0] + [-kFLF, 0, 0 ; a21,\u00a0-kOLF, 0; 0, a32, -kHRF] * [CFLF; COLF; CHF] where k is the first-order decay constant for each pool, a is the C transfer rate between pools (i.e. a21 is the transfer from FLF (pool 1) to OLF (pool 2) and a32 is the transfer from OLF (pool 2) to HF (pool 3)), and C is the C stock of each pool. The transitTime and systemAge functions within the \u201csoilR\u201d package use this model structure to solve for the distribution of ages (time since entry) of each pool, and the distribution of transit times (times between entry and exit from the bulk soil) (Sierra et al 2016). Distributions of age and transit time were time-independent and did not assume a specific distribution (Sierra et al., 2014, 2017). Figure 2: Hypothesized flow of C in soils. Free light fraction (FLF) C (pink) is either decomposed (at cycling rate -kFLF * FLF) or transferred to the occluded light fraction pool (OLF, blue) with the transfer proportion defined by a21. Carbon transfer between the OLF and heavy fraction (HF, purple) is defined by transfer coefficient a32, and is respired from these pools at cycling rates -kOLF* OLF and -kHF* HF, respectively. Figure adapted from Sierra et al. (2012). Soil D14C and C stock mean and standard deviations from each time point, depth, and fraction were used to constrain the matrix model describing the movement of C through three soil pools and losses of C from each pool. Topography was not a strong predictor of patterns in D14C, C stocks, or C fractions, so samples from all topographies were aggregated for model simulations. The model used mean observed C content in each pool for each depth in 1988 as initial conditions for SOC stocks. Above and belowground litter inputs at 0\u201310 cm were assumed to be 900 g C m-2 in non-hurricane or hurricane recovery years, based on observations from the same site (Liu et al., 2018; Scatena et al., 1996; Silver et al., 1996; Vogt et al., 1996). Inputs to the 10\u201335 cm and 35\u201360 cm depths were estimated using observations of live fine roots on the surface and typical root distribution in the forest (Silver & Vogt, 1993). Total root input is approximately threefold the input of fine roots alone (McCormack et al., 2015; Yaffar & Norby, 2020), and live fine roots in the 0\u201310 cm depth had a mean biomass of 80 - 250 g C m-2 \u00a0(Hall et al., 2015), suggesting that total root C inputs of approximately 450 g C m-2 to the surface would be well within the expected range. Root inputs below 0\u201310 cm were estimated assuming that inputs follow the typical distribution of root biomass in Puerto Rican tropical forests, with 60\u201370% of root biomass in 0\u201310 cm, an additional 20-30% of biomass in 10\u201335 cm (~135 g C m-2\u00ad), and 5\u20138% of biomass is in the 35\u201360 cm depth (~40 g C m-2\u00ad) (Silver & Vogt, 1993; Yaffar & Norby, 2020). The model was parameterized under two scenarios for each depth: 1) constant inputs, assuming a steady-state undisturbed forest, and 2) hurricane inputs, which simulated the input fluxes from defoliation during the three major hurricanes, followed by a subsequent reduction in litter inputs and then litterfall increasing linearly to pre-hurricane inputs over 6 years (Scatena et al., 1996; Silver et al., 1996; Vogt et al., 1996). Hurricane inputs were imposed as an additional pulse of litter inputs to each depth interval, declining with depth. \u00a0The 0\u201310 cm interval received 100% of the surface input pulse, the 10\u201335 cm depth received a pulse of root inputs equivalent to 30% of the surface input pulse, and the 35\u201360 cm depth received root inputs equal to 10% of the surface input pulse. Surface litter pulses under hurricanes were specified according to measured litterfall values and were 42.5 g C m-2\u00ad to the surface in 1989 (Hurricane Hugo) and 1998 (Hurricane Georges) (Scatena et al., 1993; Silver et al., 1996) and 1611 g C m-2 \u00a0in 2017 (Hurricanes Irma and Maria) (Liu et al. 2018a). The same soil D14C and C stock observations were used to constrain the model under each scenario, with only the input regime varying. Parameters of the transfer matrix (-k\u00ad\u00adFLF, -k\u00ad\u00adOLF, -k\u00ad\u00adHF, a21, a32) were constrained using a cost function to accept or reject potential parameter sets over 1000 iterations, based on observed D14C and C stock means and standard errors from both time points (1988 and 2018). A Markov chain Monte Carlo (MCMC) simulation initialized with cost-optimized parameters was run to assimilate observed data and optimize parameter choices to the observations using function modMCMC() from R package \u201cFME\u201d (Sierra et al., 2014; Soetaert & Petzoldt, 2010). The MCMC was iterated over at least 20,000 simulations or until parameter solutions converged according to the trace, which was over 100,000 iterations at the 35\u201360 cm depth. The first half of the iterations was considered the burn-in period before the chain started to converge near an equilibrium, and these iterations were discarded in calculations of optimal parameters. The model output for the surface soils of the HF pool was validated using published radiocarbon values from the mineral-associated fraction (the only fraction analyzed) of samples from the site taken in 2012 (Hall et al., 2015).\u00a0 Bulk and pool soil C age and transit time density distributions and mean values were calculated using the systemAge() and transitTime() functions from the \u201cSoilR\u201d package. Mean density distributions were calculated using the mean parameter set given from the MCMC analysis. Standard deviation from the mean was calculated using the systemAge() and transitTime() functions on 200 sets of five parameters selected randomly within one standard deviation of the mean of each parameter given as output from the MCMC. Lower and upper limits of SOC ages and transit times were calculated using the upper and lower ranges of these iterations. Statistics Statistics were run in R, version 4.0.2 (R Core Team, 2020). The statistical model selection followed the recommendations of Zuur et al (2009). Statistical models were chosen using a linear mixed effects model in package \u201clme4\u201d, with random slopes accounting for the influence each core, or sampling site, had on the response variable values as they varied with depth. This random effect of the core site on the depth effect was evaluated using a restricted maximum likelihood approach and was included in the initial evaluation of all model comparisons. Linear mixed effect models included year, topographic position, depth, and interactions as fixed factors, and the depth effect of each core as a random factor for each of the response variables: C concentration, N concentration, d13C, DD14C. In evaluations of some response variables with AIC and BIC criteria, the random effect no longer enhanced the model, and model comparison proceeded using ANOVAs of linear models without random effects. Topographic effects on C concentrations are discussed in the supplemental information. Model assumptions were evaluated using the check_model function in R package \u201cperformance\u201d, to check for multicollinearity, normality of residuals, homoscedasticity, homogeneity of variance, influential observations, and normality of random effects. In the cases when random effects were significant (bulk soil d13C and DD14C, FLF DD14C and HF C and N concentrations), fixed effects were chosen using ANOVA of subsequent models using maximum likelihood estimation, with the random effects held constant. Once fixed effects were established, the model was re-fitted using a restricted maximum likelihood approach to report model estimates, and an ANOVA was run to determine the significance of the response variable. In all cases, P-values were estimated using Tukey\u2019s honest significant post-hoc test to assess significant differences between variables, in the package \u201cagricolae\u201d in R, and contrasts and standard errors of contrasts were estimated using lsmeans() function in package \u201clsmeans\u201d in R. Values of\u00a0P < 0.10 were reported as significant unless otherwise specified. The topographic position was not a significant predictor for most variables, so results are reported as means aggregated across positions.", "keywords": ["soil organic carbon", "Transit time", "Tropical forest soil", "FOS: Earth and related environmental sciences", "Soil R", "density fractions", "Radiocarbon"], "contacts": [{"organization": "Mayer, Allegra", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.0k6djhb5k"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.0k6djhb5k", "name": "item", "description": "10.5061/dryad.0k6djhb5k", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.0k6djhb5k"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-04-01T00:00:00Z"}}, {"id": "10.5061/dryad.845kg37", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:20:55Z", "type": "Dataset", "title": "Data from: Resource acquisition strategies facilitate Gilbertiodendron dewevrei monodominance in African lowland forests", "description": "unspecified1. Tropical forests are hyperdiverse, yet extensive areas of monodominant forest occur in the tropics worldwide. Most long-lived and persistent monodominant tree species form ectomycorrhizal fungi symbioses, allowing them to obtain nutrients directly from soil organic matter. This might promote monodominance by reducing nutrient availability to co-occurring species, the majority of which form associations with arbuscular mycorrhizal fungi. 2. Gilbertiodendron dewevrei forest is the most widespread monodominant forest in tropical Africa. Its distribution appears determined in part by moisture availability, but its monodominance is not thought to be driven by its fungal partner or soil fertility. 3. Here we compare soil fertility of twenty G. dewevrei stands to mixed forest from three sites across an 8,400 km2 region of the Central African Republic and the Republic of Congo. In contrast to previous studies, we find monodominant G. dewevrei stands associated with infertile soils, as base cations (calcium, magnesium, total exchangeable bases) and extractable manganese are extremely low, and significantly lower in soils under G. dewevrei forest compared to mixed forest. Further, and consistent with ectomycorrhizal forests globally, soil carbon to nitrogen and carbon to phosphorus ratios are significantly higher in G. dewevrei stands than in mixed forest stands, providing evidence in support of direct acquisition of nitrogen and phosphorus from soil organic matter by ectomycorrhizal fungi. 4. Gilbertiodendron dewevrei recruits from the seedling bank, with its large seedlings surviving in high densities for over a decade. We tested whether light plasticity could facilitate monodominance by growing seedlings of G. dewevrei under controlled light conditions. We found that its seedlings grow well under a wide range of irradiance levels and conclude that this plasticity affords a competitive advantage. 5. Synthesis: We reframe the discussion of factors contributing to monodominance of G. dewevrei into one of resource acquisition and use efficiency. In particular, G. dewevrei is associated with moist and infertile soils and competes well under a variety of light conditions. Our data is consistent with a model where root associations with ectomycorrhizal fungi drive monodominance through the direct acquisition of nutrients from soil organic matter, promoting nutrient limitation of co-occurring species.", "keywords": ["2. Zero hunger", "C:N and C:P ratios", "Congo Basin", "Central Africa", "ectomycorrhizal fungi", "15. Life on land", "Monodominant tropical forest", "Gilbertiodendron dewevrei"], "contacts": [{"organization": "Hall, Jefferson, Harris, David, Saltonsall, Kristin, Medjibe, Vincent, Ashton, Mark, Turner, Benjamin,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.845kg37"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.845kg37", "name": "item", "description": "10.5061/dryad.845kg37", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.845kg37"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2020-08-26T00:00:00Z"}}, {"id": "10.5061/dryad.bvq83bkbg", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:20:57Z", "type": "Dataset", "title": "Recent photosynthates are the primary carbon source for soil microbial respiration in subtropical forests", "description": "unspecifiedTropical and subtropical forests represent the largest terrestrial carbon pool. Elucidating the carbon sources for soil microbial respiration (Rm) in tropical and subtropical forests is of fundamental importance to the global carbon cycle in a warming world. Based on hourly measurements, we quantified Rm of\u00a0in situ\u00a0forest soil and soil cores from a subtropical forest. We found recent photosynthates, not soil organic carbon (SOC), contributed 88% \u00b1 12% of the carbon source fueling Rm. The control of recent photosynthates on Rm is also supported by the close relationship between Rm and photosynthetically active radiation as well as literature data synthesis results. These results challenge conventional models based on the tenet that Rm is mainly regulated by soil temperature in all forest ecosystems. The results imply that the widely observed warming-induced Rm increases are largely explained by the enhanced input of recent photosynthates in tropical forests, not SOC consumption.", "keywords": ["recent photosynthates", "microbial respiration", "13. Climate action", "FOS: Earth and related environmental sciences", "15. Life on land", "subtropical forest"], "contacts": [{"organization": "Yang, zhijie, Lin, Teng-Chiu, Wang, Lixin, Yang, Yusheng,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.bvq83bkbg"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.bvq83bkbg", "name": "item", "description": "10.5061/dryad.bvq83bkbg", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.bvq83bkbg"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-10-25T00:00:00Z"}}, {"id": "10.5061/dryad.rn8pk0ph5", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:01Z", "type": "Dataset", "title": "Drivers of soil organic carbon stock during tropical forest succession", "description": "Soil organic matter contributes to productivity in terrestrial ecosystems and contains more carbon than is found in the atmosphere. Yet, there is little understanding of soil organic carbon (SOC) sequestration processes during tropical forest succession, particularly after land abandonment from agriculture practices. Here we used vegetation and environmental data from two large-scale surveys covering a total landscape area of 20,000 ha in Southeast Asia to investigate the effects of plant species diversity, functional trait diversity, phylogenetic diversity, aboveground biomass, and environmental factors on SOC sequestration during forest succession. We found that functional trait diversity plays an important role in determining SOC sequestration across successional trajectories. Increases in SOC carbon storage were associated with indirect positive effects of species diversity and succession age via functional trait diversity, but phylogenetic diversity and aboveground biomass showed no significant relationship with SOC stock. Furthermore, the effects of soil properties and functional trait diversity on SOC carbon storage shift across elevation. Synthesis: Our results suggest that reforestation and restoration management practices that implement a trait-based approach by combining long-lived and short-lived species (conservative and acquisitive traits) to increase plant functional diversity could enhance SOC sequestration for climate change mitigation and adaptation efforts, as well as accelerate recovery of healthy soils.", "keywords": ["2. Zero hunger", "tropical forest", "FOS: Agriculture", " forestry", " and fisheries", "15. Life on land", "forest soil", "functional diversity", "plant diversity", "swidden agriculture", "soil organic carbon", "13. Climate action", "forest succession", "functional traits", "tropical forest ecology", "soil carbon stock"]}, "links": [{"href": "https://doi.org/10.5061/dryad.rn8pk0ph5"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.rn8pk0ph5", "name": "item", "description": "10.5061/dryad.rn8pk0ph5", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.rn8pk0ph5"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-05-26T00:00:00Z"}}, {"id": "10.5281/zenodo.1127666", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:38Z", "type": "Dataset", "title": "Soil Carbon Dynamics In Soybean Cropland And Forests In Mato Grosso, Brazil", "description": "Open AccessThese files contain the carbon content, radiocarbon, and stable isotope data for soils collected to 2 m deep in forest and soybean cropland in Mato Grosso, Brazil.", "keywords": ["soil carbon", " agriculture", " land use", " Brazil", " tropical forest", " isotopes", "15. Life on land"], "contacts": [{"organization": "Nagy, R. Chelsea, Porder, Stephen, Brando, Paulo, Davidson, Eric, Figueira, Adelaine Michela e Silva, Neill, Christopher, Riskin, Shelby, Trumbore, Susan,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.1127666"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.1127666", "name": "item", "description": "10.5281/zenodo.1127666", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.1127666"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-12-22T00:00:00Z"}}, {"id": "10.5281/zenodo.1127667", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:21:38Z", "type": "Dataset", "title": "Soil Carbon Dynamics In Soybean Cropland And Forests In Mato Grosso, Brazil", "description": "Open AccessThese files contain the carbon content, radiocarbon, and stable isotope data for soils collected to 2 m deep in forest and soybean cropland in Mato Grosso, Brazil.", "keywords": ["soil carbon", " agriculture", " land use", " Brazil", " tropical forest", " isotopes", "15. Life on land"], "contacts": [{"organization": "Nagy, R. Chelsea, Porder, Stephen, Brando, Paulo, Davidson, Eric, Figueira, Adelaine Michela e Silva, Neill, Christopher, Riskin, Shelby, Trumbore, Susan,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.1127667"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.1127667", "name": "item", "description": "10.5281/zenodo.1127667", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.1127667"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-12-22T00:00:00Z"}}, {"id": "10.5281/zenodo.17606854", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:22:31Z", "type": "Dataset", "title": "Data for study of divergent microbial strategies under topographically decoupled disturbances linking contrasting soil carbon fates following tree mortality", "description": "This deposit provides the curated soil, microbial and genomic trait datasets used to reproduce the analyses in the study on topographically decoupled tree mortality disturbances, microbial strategies and soil organic carbon (SOC) dynamics in a subtropical forest. Files include soil physicochemical properties, bacterial and fungal amplicon feature tables (16S, ITS), metagenomic gene count tables and functional annotations for carbon-degrading and terminal-electron-acceptor utilization genes, genome-derived gene copy number variation matrices for bacterial and fungal taxa, and derived community and model outputs (e.g. microbial composition summaries and XGBoost cross-validation results). These tables correspond to the input data required by the R scripts in the companion code repository (https://github.com/zhangdx2025/tree-mortality-soil-carbon) and allow regeneration of the numerical results and figures in the associated manuscript. Raw sequencing reads are not included here; their access information is provided in the article.", "keywords": ["Soil organic carbon; Tree mortality; Subtropical forest; Microbial strategies; Topography"], "contacts": [{"organization": "Dongxu, Zhang", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5281/zenodo.17606854"}, {"rel": "self", "type": "application/geo+json", "title": "10.5281/zenodo.17606854", "name": "item", "description": "10.5281/zenodo.17606854", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5281/zenodo.17606854"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2025-11-14T00:00:00Z"}}, {"id": "10067/1640270151162165141", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:23:42Z", "type": "Journal Article", "created": "2019-11-13", "title": "Disentangling Drought and Nutrient Effects on Soil Carbon Dioxide and Methane Fluxes in a Tropical Forest", "description": "Tropical soils are a major contributor to the balance of greenhouse gas (GHG) fluxes in the atmosphere. Models of tropical GHG fluxes predict that both the frequency of drought events and changes in atmospheric deposition of nitrogen (N) will significantly affect dynamics of soil carbon dioxide (CO2) and methane (CH4) production and consumption. In this study, we examined the combined effect of a reduction in precipitation and an increase in nutrient availability on soil CO2 and CH4 fluxes in a primary French Guiana tropical forest. Drought conditions were simulated by intercepting precipitation falling through the forest canopy with tarpaulin roofs. Nutrient availability was manipulated through application of granular N and / or phosphorus (P) fertilizer to the soil. Soil water content (SWC) below the roofs decreased rapidly and stayed at continuously low values until roof removal, which as a consequence roughly doubled the duration of the dry season. After roof removal, SWC slowly increased but remained lower than in the control soils even after 2.5 months of wet-season precipitation. We showed that drought-imposed reduction in SWC decreased the CO2 emissions (i.e CO2 efflux), but strongly increased the CH4 emissions. N, P and N \u00d7 P (i.e. NP) additions all significantly increased CO2 emission but had no effect on CH4 fluxes. In treatments where both fertilization and drought were applied, the positive effect of N, P and NP fertilization on CO2 efflux was reduced. After roof removal, soil CO2 efflux was more resilient in the control plots than in the fertilized plots while there was only a modest effect of roof removal on soil CH4 fluxes. Our results suggest that a combined increase in drought and nutrient availability in soil can locally increase the emissions of both CO2 and CH4 from tropical soils, for a long term.", "keywords": ["tropical forest", "[SDE] Environmental Sciences", "550", "Nitrogen", "soil GHG fluxes", "drought", "01 natural sciences", "nitrogen", "Tropical forest", "GE1-350", "phosphorus", "Biology", "0105 earth and related environmental sciences", "2. Zero hunger", "Drought", "methane", "carbon dioxide", "Phosphorus", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water", "Environmental sciences", "Chemistry", "Carbon dioxide", "fertilization", "13. Climate action", "Fertilization", "[SDE]Environmental Sciences", "0401 agriculture", " forestry", " and fisheries", "Soil GHG fluxes", "Methane"]}, "links": [{"href": "https://doi.org/10067/1640270151162165141"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Frontiers%20in%20Environmental%20Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10067/1640270151162165141", "name": "item", "description": "10067/1640270151162165141", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10067/1640270151162165141"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-11-13T00:00:00Z"}}, {"id": "11104/0365439", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:24:03Z", "type": "Journal Article", "created": "2025-01-17", "title": "Insights into the subdaily variations in methane, nitrous oxide and carbon dioxide fluxes from upland tropical tree stems", "description": "Summary
Recent studies have shown that stem fluxes, although highly variable among trees, can alter the strength of the methane (CH4) sink or nitrous oxide (N2O) source in some forests, but the patterns and magnitudes of these fluxes remain unclear. This study investigated the drivers of subdaily and seasonal variations in stem and soil CH4, N2O and carbon dioxide (CO2) fluxes.
CH4, N2O and CO2 fluxes were measured continuously for 19\uffe2\uff80\uff89months in individual stems of two tree species, Eperua falcata (Aubl.) and Lecythis poiteaui (O. Berg), and surrounding soils using an automated chamber system in an upland tropical forest. Subdaily variations in these fluxes were related to environmental and stem physiological (sap flow and stem diameter variations) measurements under contrasting soil water conditions.
The results showed that physiological and climatic drivers only partially explained the subdaily flux variations. Stem CH4 and CO2 emissions and N2O uptake varied with soil water content, time of day and between individuals. Stem fluxes decoupled from soil fluxes.
Our study contributes to understanding the regulation of stem greenhouse gas fluxes. It suggests that additional variables (e.g. internal gas concentrations, wood\uffe2\uff80\uff90colonising microorganisms, wood density and anatomy) may account for the remaining unexplained variability in stem fluxes, highlighting the need for further studies.
Climate and land use models predict that tropical deforestation and conversion to cropland will produce a large flux of soil carbon (C) to the atmosphere from accelerated decomposition of soil organic matter (SOM). However, the C flux from the deep tropical soils on which most intensive crop agriculture is now expanding remains poorly constrained. To quantify the effect of intensive agriculture on tropical soil C, we compared C stocks, radiocarbon, and stable C isotopes to 2\uffc2\uffa0m depth from forests and soybean cropland created from former pasture in Mato Grosso, Brazil. We hypothesized that soil disturbance, higher soil temperatures (+2\uffc2\uffb0C), and lower OM inputs from soybeans would increase soil C turnover and deplete C stocks relative to nearby forest soils. However, we found reduced C concentrations and stocks only in surface soils (0\uffe2\uff80\uff9310\uffc2\uffa0cm) of soybean cropland compared with forests, and these differences could be explained by soil mixing during plowing. The amount and \uffce\uff9414C of respired CO2 to 50\uffc2\uffa0cm depth were significantly lower from soybean soils, yet CO2 production at 2\uffc2\uffa0m deep was low in both forest and soybean soils. Mean surface soil \uffce\uffb413C decreased by 0.5\uffe2\uff80\uffb0 between 2009 and 2013 in soybean cropland, suggesting low OM inputs from soybeans. Together these findings suggest the following: (1) soil C is relatively resistant to changes in land use and (2) conversion to cropland caused a small, measurable reduction in the fast\uffe2\uff80\uff90cycling C pool through reduced OM inputs, mobilization of older C from soil mixing, and/or destabilization of SOM in surface soils.There is a clear need for transformative change in the land management and food production sectors to address the global land challenges of climate change mitigation, climate change adaptation, combatting land degradation and desertification, and delivering food security (referred to hereafter as \uffe2\uff80\uff9cland challenges\uffe2\uff80\uff9d). We assess the potential for 40 practices to address these land challenges and find that: Nine options deliver medium to large benefits for all four land challenges. A further two options have no global estimates for adaptation, but have medium to large benefits for all other land challenges. Five options have large mitigation potential (>3\uffc2\uffa0Gt CO2eq/year) without adverse impacts on the other land challenges. Five options have moderate mitigation potential, with no adverse impacts on the other land challenges. Sixteen practices have large adaptation potential (>25 million people benefit), without adverse side effects on other land challenges. Most practices can be applied without competing for available land. However, seven options could result in competition for land. A large number of practices do not require dedicated land, including several land management options, all value chain options, and all risk management options. Four options could greatly increase competition for land if applied at a large scale, though the impact is scale and context specific, highlighting the need for safeguards to ensure that expansion of land for mitigation does not impact natural systems and food security. A number of practices, such as increased food productivity, dietary change and reduced food loss and waste, can reduce demand for land conversion, thereby potentially freeing\uffe2\uff80\uff90up land and creating opportunities for enhanced implementation of other practices, making them important components of portfolios of practices to address the combined land challenges.Elucidating dynamics of soil microbial communities after disturbance is crucial for understanding ecosystem restoration and sustainability. However, despite the widespread practice of swidden agriculture in tropical forests, knowledge about microbial community succession in this system is limited. Here, amplicon sequencing was used to investigate effects of soil ages (spanning at least 60 years) after disturbance, geographic distance (from 0.1 to 10 km) and edaphic property gradients (soil pH, conductivity, C, N, P, Ca, Mg, and K), on soil bacterial and fungal communities along a chronosequence of sites representing the spontaneous succession following swidden agriculture in lowland forests in Papua New Guinea. During succession, bacterial communities (OTU level) as well as its abundant (OTU with relative abundance > 0.5%) and rare (<0.05%) subcommunities, showed less variation but more stage-dependent patterns than those of fungi. Fungal community dynamics were significantly associated only with geographic distance, whereas bacterial community dynamics were significantly associated with edaphic factors and geographic distance. During succession, more OTUs were consistently abundant (n = 12) or rare (n = 653) for bacteria than fungi (abundant = 6, rare = 5), indicating bacteria were more tolerant than fungi to environmental gradients. Rare taxa showed higher successional dynamics than abundant taxa, and rare bacteria (mainly from Actinobacteria, Proteobacteria, Acidobacteria, and Verrucomicrobia) largely accounted for bacterial community development and niche differentiation during succession.South China has been experiencing very high rate of acid deposition and severe soil acidification in recent decades, which has been proposed to exacerbate the regional ecosystem phosphorus (P) limitation. We conducted a 10\uffe2\uff80\uff90year field experiment of simulated acid deposition to examine how acidification impacts seasonal changes of different soil P fractions in a tropical forest with highly acidic soils in south China. As expected, acid addition significantly increased occluded P pool but reduced the other more labile P pools in the dry season. In the wet season, however, acid addition did not change microbial P, soluble P and labile organic P pools. Acid addition significantly increased exchangeable Al3+ and Fe3+ and the activation of Fe oxides in both seasons. Different from the decline of microbial abundance in the dry season, acid addition increased ectomycorrhizal fungi and its ratio to arbuscular mycorrhiza fungi in the wet season, which significantly stimulated phosphomonoesterase activities and likely promoted the dissolution of occluded P. Our results suggest that, even in already highly acidic soils, the acidification\uffe2\uff80\uff90induced P limitation could be alleviated by stimulating ectomycorrhizal fungi and phosphomonoesterase activities. The differential responses and microbial controls of seasonal soil P transformation revealed here should be implemented into ecosystem biogeochemical model for predicting plant productivity under future acid deposition scenarios.10 000 interactions - 807 esp\u00e8ces d'arbres et 285 esp\u00e8ces animales. La structure du r\u00e9seau a \u00e9t\u00e9 analys\u00e9e avec un latent block model, une m\u00e9thode qui groupe des esp\u00e8ces pr\u00e9sentant des sch\u00e9mas d'interaction similaires et estime les probabilit\u00e9s d'interaction entre elles. Les grands frugivores \u00e9taient les principaux disperseurs de la plupart des arbres et les grands arbres \u00e9taient les principales sources de fruits de la plupart des frugivores. Nos r\u00e9sultats montrent aussi la vuln\u00e9rabilit\u00e9 de ce r\u00e9seau de frugivorie et l'int\u00e9grit\u00e9 fragile des for\u00eats Afrotropicales.Le chapitre 2 s'est concentr\u00e9 sur les variations des traits des communaut\u00e9s d'arbres dans les for\u00eats du Bassin du Congo en relation avec les interactions frugivores. Nos r\u00e9sultats ont montr\u00e9 des diff\u00e9rences dans les traits li\u00e9s \u00e0 la frugivorie selon les types floristiques, les for\u00eats atlantiques offrant de plus gros fruits, tandis que les for\u00eats du Nord pr\u00e9sentaient une plus grande abondance de petits fruits. Nous avons constat\u00e9 que les chimpanz\u00e9s et les calaos interagissent avec les fruits les plus abondants, les \u00e9l\u00e9phants consomment toujours les plus gros fruits offerts par la communaut\u00e9, tandis que les petits oiseaux consomment les plus petits fruits.Le chapitre 3 s'est concentr\u00e9 sur les connaissances \u00e9cologiques locales (LEK) en rapport avec les interactions de frugivorie. Nous avons utilis\u00e9 un ensemble commun d'arbres et d'esp\u00e8ces de frugivores, afin de comparer les informations provenant des LEK et les connaissances acad\u00e9miques. Les populations locales avaient une connaissance substantielle des relations entre arbres et frugivores, avec 39% de nouvelles interactions, modifiant \u00e9galement la structure du r\u00e9seau de frugivorie, en attribuant en moyenne de plus petits frugivores aux esp\u00e8ces d'arbres.Dans le chapitre 4, l\u2019utilisation de cam\u00e9ras pour enregistrer les interactions entre arbres et frugivores de la communaut\u00e9 foresti\u00e8re des frugivores terrestres du Gabon, a permis d\u2019ajouter plus de 30% de nouvelles interactions. La plupart de ces interactions concernaient les petits frugivores comme les rongeurs, mais aussi les grands mammif\u00e8res comme les \u00e9l\u00e9phants et les gorilles. Ces r\u00e9sultats montrent la n\u00e9cessit\u00e9 de poursuivre les recherches sur les interactions arbres-frugivores mais aussi d'int\u00e9grer d'autres sources compl\u00e9mentaires pour appr\u00e9cier la complexit\u00e9 des r\u00e9seaux mutualistes.Ce travail de th\u00e8se a permis de comprendre les diff\u00e9rents m\u00e9canismes qui r\u00e9gissent les interactions entre les arbres et les frugivores, notamment l'importance de la distribution spatiale des esp\u00e8ces et leurs traits biologiques. Nous avons \u00e9galement mis en \u00e9vidence des biais concernant les donn\u00e9es, la plupart des \u00e9tudes portant sur des esp\u00e8ces embl\u00e9matiques et certaines zones, et concernant les diff\u00e9rentes m\u00e9thodes, les cam\u00e9ras se concentrant sur les frugivores terrestres et le LEK \u00e9tant born\u00e9 par les connaissances acad\u00e9miques. Ces r\u00e9sultats nous ont permis de formuler des recommandations pour contrer ces biais, dont la diversification des m\u00e9thodes d'\u00e9chantillonnage des interactions, notamment en collaborant avec les populations locales dans diverses zones Afrotropicales.", "keywords": ["For\u00eats tropicales africaines", "African tropical forest", "Defaunation", "\u00c9cologie des communaut\u00e9s", "Frugivorie", "[SDE.ES] Environmental Sciences/Environment and Society", "Frugivory", "Community ecology", "15. Life on land", "\u00c9cologie tropicale", "Tropical ecology", "D\u00e9faunation"], "contacts": [{"organization": "Durand-Bessart, Clementine", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/50|od______3711::54ca06bb7bccbc8f1d796db5eb07f4cc"}, {"rel": "self", "type": "application/geo+json", "title": "50|od______3711::54ca06bb7bccbc8f1d796db5eb07f4cc", "name": "item", "description": "50|od______3711::54ca06bb7bccbc8f1d796db5eb07f4cc", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/50|od______3711::54ca06bb7bccbc8f1d796db5eb07f4cc"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-01-01T00:00:00Z"}}, {"id": "PMC8215787", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-24T16:27:11Z", "type": "Journal Article", "created": "2021-06-07", "title": "Dynamics of Soil Bacterial and Fungal Communities During the Secondary Succession Following Swidden Agriculture IN Lowland Forests", "description": "Elucidating dynamics of soil microbial communities after disturbance is crucial for understanding ecosystem restoration and sustainability. However, despite the widespread practice of swidden agriculture in tropical forests, knowledge about microbial community succession in this system is limited. Here, amplicon sequencing was used to investigate effects of soil ages (spanning at least 60 years) after disturbance, geographic distance (from 0.1 to 10 km) and edaphic property gradients (soil pH, conductivity, C, N, P, Ca, Mg, and K), on soil bacterial and fungal communities along a chronosequence of sites representing the spontaneous succession following swidden agriculture in lowland forests in Papua New Guinea. During succession, bacterial communities (OTU level) as well as its abundant (OTU with relative abundance > 0.5%) and rare (<0.05%) subcommunities, showed less variation but more stage-dependent patterns than those of fungi. Fungal community dynamics were significantly associated only with geographic distance, whereas bacterial community dynamics were significantly associated with edaphic factors and geographic distance. During succession, more OTUs were consistently abundant (n = 12) or rare (n = 653) for bacteria than fungi (abundant = 6, rare = 5), indicating bacteria were more tolerant than fungi to environmental gradients. Rare taxa showed higher successional dynamics than abundant taxa, and rare bacteria (mainly from Actinobacteria, Proteobacteria, Acidobacteria, and Verrucomicrobia) largely accounted for bacterial community development and niche differentiation during succession.