{"type": "FeatureCollection", "features": [{"id": "10.1007/s11104-023-05991-y", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:15:08Z", "type": "Journal Article", "created": "2023-05-10", "title": "Tree stem and soil methane and nitrous oxide fluxes, but not carbon dioxide fluxes, switch sign along a topographic gradient in a tropical forest", "description": "Purpose<br/>Tropical forests exchange large amounts of greenhouse gases (GHGs: carbon dioxide, CO2; methane, CH4; and nitrous oxide, N2O) with the atmosphere. Forest soils and stems can be either sources or sinks for CH4 and N2O, but little is known about what determines the sign and magnitude of these fluxes. Here, we aimed to study how stem and soil GHG fluxes vary along a topographic gradient in a tropical forest.<br/><br/>Methods<br/>Fluxes of GHG from 56 individual tree stems and adjacent soils were measured with manual static chambers. The topographic gradient was characterized by a soil moisture gradient, with one end in a wetland area (\u201cseasonally flooded\u201d; SF), the other end in an upland area (\u201cterra firme\u201d; TF) and in between a transitional area on the slope (SL).<br/><br/>Results<br/>Tree stems and soils were always sources of CO2 with higher fluxes in SF compared to TF and SL. Fluxes of CH4 and N2O were more variable, even within one habitat. Results showed that, in TF, soils acted as sinks for N2O whereas, in SF and SL, they acted as sources. In contrast, tree stems which were predominantly sources of N2O in SF and TF, were sinks in SL. In the soil, N2O fluxes were significantly influenced by both temperature and soil water content, whereas CH4 fluxes were only significantly correlated with soil water content.<br/><br/>Conclusion<br/>SF areas were major sources of the three gases, whereas SL and TF soils and tree stems acted as either sources or sinks for CH4 and N2O. Our results indicate that tree stems represent overlooked sources of CH4 and N2O in tropical forests that need to be further studied to refine GHG budgets.", "keywords": ["[SDV.SA.AGRO] Life Sciences [q-bio]/Agricultural sciences/Agronomy", "106022 Mikrobiologie", "550", "source", "Spatial variation", "Sink", "[SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy", "spatial variation", "Source", "15. Life on land", "Stem", "630", "soil", "[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics", "Soil", "Greenhouse gas (GHG) exchange", "13. Climate action", "106026 \u00d6kosystemforschung", "[SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants genetics", "106022 Microbiology", "stem", "sink", "106026 Ecosystem research", "Biology", "greenhouse gas (GHG) exchange"]}, "links": [{"href": "https://doi.org/10.1007/s11104-023-05991-y"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s11104-023-05991-y", "name": "item", "description": "10.1007/s11104-023-05991-y", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11104-023-05991-y"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-05-09T00:00:00Z"}}, {"id": "10.1016/j.agee.2016.01.026", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:15:22Z", "type": "Journal Article", "created": "2016-02-14", "title": "Overgrazing decreases soil organic carbon stocks the most under dry climates and low soil pH: A meta-analysis shows", "description": "Grasslands occupy about 40% of the world\u2019s land surface and store approximately 10% of the global soil organic carbon (SOC) stock. This SOC pool, in which a larger proportion is held in the topsoil (0\u20130.3 m), is strongly influenced by grassland management. Despite this, it is not yet fully understood how grassland SOC stocks respond to degradation, particularly for the different environmental conditions found globally. The objective of this review was to elucidate the impact of grassland degradation on changes in SOC stocks and the main environmental controls, worldwide, as a prerequisite for rehabilitation. A comprehensive meta-analysis was conducted using 55 studies with 628 soil profiles under temperate, humid, sub-humid, tropical and semi-arid conditions, to compare SOC stocks in the topsoil of non-degraded and degraded grassland soils. Grassland degradation significantly reduced SOC stocks by 16% in dry climates ( 1000 mm) and Asia was the most affected continent (\u221223.7%). Moreover, the depletion of SOC stock induced by degradation was more pronounced in sandy (<20% clay) soils with a high SOC depletion of 10% compared to 1% in clayey (\u226532% clay) soils. Furthermore, grassland degradation significantly reduced SOC by 14% in acidic soils (pH \u2264 5), while SOC changes were negligible for higher pH. Assuming that 30% of grasslands worldwide are degraded, the amount of SOC likely to be lost would be 4.05 Gt C, with a 95% confidence between 1.8 and 6.3 Gt C (i.e. from 1.2 to 4.2% of the whole grassland soil stock). These results by pointing to greater SOC losses from grasslands under dry climates and sandy acidic soils allow identification of grassland soils for which SOC stocks are the most vulnerable, while also informing on rehabilitation measures.", "keywords": ["580", "2. Zero hunger", "570", "Spatial variation", "[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]", "Climate Change", "[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]", "04 agricultural and veterinary sciences", "15. Life on land", "SOC stocks", "Grassland degradation", "630", "Soil", "Controlling factors", "13. Climate action", "Grasslands", "0401 agriculture", " forestry", " and fisheries"]}, "links": [{"href": "https://doi.org/10.1016/j.agee.2016.01.026"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agriculture%2C%20Ecosystems%20%26amp%3B%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.agee.2016.01.026", "name": "item", "description": "10.1016/j.agee.2016.01.026", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.agee.2016.01.026"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-04-01T00:00:00Z"}}, {"id": "10.1016/j.biocon.2011.11.024", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:15:33Z", "type": "Journal Article", "created": "2011-12-19", "title": "Alpha- And Beta-Diversity In Moth Communities In Salt Marshes Is Driven By Grazing Management", "description": "<p>This study evaluates the effects of long-term sheep grazing in salt marshes on the diversity of moths and derives conclusive management suggestions for the conservation of invertebrate diversity in salt marshes. Study sites were located on the Hamburger Hallig, on the Western coast of Schleswig-Holstein, Germany. Between 2006 and 2009, salt marshes that have been under four levels of livestock density (0, 1-2 sheep/ha, 3-4 sheep/ha, 10 sheep/ha) for over 20 years were sampled using light traps and photoeclectors. Plant and moth species richness were highest under low stocking densities, moth species richness, however, showed no difference between low stocking densities and abandonment. Species richness of moths was only weakly correlated with vegetation parameters (species richness, vegetation height, cover and litter). Using additive diversity partitioning we show that no single grazing treatment harbored all recorded moth species and that grazing increases habitat heterogeneity within each treatment. Additionally, we show that moths react more sensitively to grazing than plants, and that therefore assessments of plant species richness in salt marshes do not allow conclusions on invertebrate diversity. For the evaluation of salt-marsh diversity, a multi-species approach should be favored combining plant and invertebrate assessments. A mosaic of abandoned sites and sites with low and intermediate stocking densities would benefit moth diversity in salt-marsh conservation. (C) 2011 Elsevier Ltd. All rights reserved.</p>", "keywords": ["Additive diversity partitioning", "PLANT DIVERSITY", "0106 biological sciences", "LONG-TERM", "Small scale", "CONSERVATION", "SPECIES-DIVERSITY", "WESTERN FRANCE", "HABITAT HETEROGENEITY", "/dk/atira/pure/core/keywords/biology; name=Ecosystems Research", "Microlepidoptera", "15. Life on land", "01 natural sciences", "Vegetation structure", "Plant diversity", "FARMLAND BIODIVERSITY", "GEE", "GAMMA-DIVERSITY", "SPATIAL VARIATION", "14. Life underwater", "GRASSLANDS"]}, "links": [{"href": "https://doi.org/10.1016/j.biocon.2011.11.024"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biological%20Conservation", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.biocon.2011.11.024", "name": "item", "description": "10.1016/j.biocon.2011.11.024", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.biocon.2011.11.024"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2012-02-01T00:00:00Z"}}, {"id": "10.1016/j.scitotenv.2022.153162", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:16:24Z", "type": "Journal Article", "created": "2022-01-18", "title": "Global marine litter research 2015\u20132020: Geographical and methodological trends", "description": "A systematic review of research on marine macrolitter densities in the past five years (2015-2020) revealed considerable knowledge gaps in the field. Nearly half he reviewed studies were on stranded litter. Data are scarce from many of the regions estimated to mismanage the largest amounts of plastic waste. In regions where data are available these are typically from coastal areas with few data from the high and deep seas; 57% and 87% of studies on pelagic and seafloor litter, respectively, took place within 100 km from shore. Data on pelagic litter are generally constrained to the sea surface and only two of 30 pelagic studies have measured macrolitter deeper in the water column. Reported litter densities are generally highest for stranded litter, although seafloor litter densities by weight are high in some areas. Reported densities of floating litter are several orders of magnitude lower. However, a lack of standardisation of methods makes it difficult both to assess and to compare litter densities within and across the different environmental compartments in time and space. The review illustrates a great need for survey design development within the field of macroplastics and point to some long-established considerations from ecological research pertaining to independence of data points, spatial autocorrelation, sampling scale, and plot size and shape which are highly relevant also for marine litter research. These considerations are relevant both for global standardisation efforts and for independent studies. Furthermore, the knowledge gaps created by geographic and compartment biases in research needs to be addressed to identify further research needs, validate models and inform policy.", "keywords": ["Survey design", "Waste Products", "0106 biological sciences", "Marine litter", "Geography", "Spatial variation", "Macroplastics", "15. Life on land", "01 natural sciences", "Time", "13. Climate action", "Autocorrelation", "Systematic review", "14. Life underwater", "Plastics", "Environmental Monitoring", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.scitotenv.2022.153162"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science%20of%20The%20Total%20Environment", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.scitotenv.2022.153162", "name": "item", "description": "10.1016/j.scitotenv.2022.153162", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.scitotenv.2022.153162"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2022-05-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2017.04.016", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-09-22T16:16:35Z", "type": "Journal Article", "created": "2017-04-29", "title": "Soil Macrofauna Abundance Under Dominant Tree Species Increases Along A Soil Degradation Gradient", "description": "Abstract   Soil macrofauna contribute to key soil functions underpinning soil-mediated ecosystem services. There is limited understanding about the role of trees as \u2018resource islands\u2019 for soil macrofauna in agricultural landscapes and how this interaction is affected by soil degradation status. The study assessed the spatial influence of three dominant trees namely,  Croton megalocarpus ,  Eucalyptus grandis  and  Zanthoxylum gilletii , on soil macrofauna abundance, along a soil degradation gradient resulting from continuous cultivation for 10, 16 and 62 years. It was hypothesised that spatial variation in soil macrofauna abundance is affected by duration of cultivation, tree species and distance from the tree trunk. Soils cultivated for 10 years showed highest soil nutrient levels. Notably, soil C and N were higher below the canopy of  C.\u00a0megalocarpus  (64.6\u00a0g\u00a0kg \u22121  C; 6.7\u00a0g\u00a0kg \u22121  N), than  E.\u00a0grandis  (58.7\u00a0g\u00a0kg \u22121  C; 5.9\u00a0g\u00a0kg \u22121  N) and  Z.\u00a0gilletii  (54.5\u00a0g\u00a0kg \u22121  C; 5.6\u00a0g\u00a0kg \u22121  N) after 10 years of cultivation. Similar trends were also found after 16 and 62 years of cultivation, although the mean values for the two elements were below 40.0\u00a0g\u00a0kg \u22121  and 4.0\u00a0g\u00a0kg \u22121 , respectively. Higher soil macrofauna abundance was found after 16 and 62 years of cultivation, though this was dependent on tree species and soil macrofauna group. Earthworm abundance was highest below the canopy of  Z.\u00a0gilletii  averaging 389 individuals and 160 individuals m \u22122 , respectively, compared to 14 individuals m \u22122  after 10 years of cultivation. Conversely, beetles showed higher numbers under  E.\u00a0grandis  and  C.\u00a0megalocarpus  than under  Z.\u00a0gilletii . Highest numbers of termites and centipedes were found under  E.\u00a0grandis  after 16 years of cultivation. These findings support the importance of a diverse tree cover in agricultural landscapes to conserve soil macrofauna communities and the contribution of their activity to soil ecological functions.", "keywords": ["Eucalyptus grandis", "570", "Spatial variation", "Croton megalocarpus", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "Zanthoxylum gilletii", "15. Life on land", "Organic resource quality", "Soil biodiversity"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2017.04.016"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2017.04.016", "name": "item", "description": "10.1016/j.soilbio.2017.04.016", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2017.04.016"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-09-01T00:00:00Z"}}, {"id": "10.1016/j.still.2017.07.015", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:16:46Z", "type": "Journal Article", "created": "2017-08-23", "title": "Spatial variability of soil properties and cereal yield in a cultivated field on sandy soil", "description": "Abstract   Sandy soils are used in agriculture in different regions of the world. In Poland soils derived from sands occupy about 50% of agricultural area. Productivity of the soils depend on the soil properties that vary in the scale of field. This study aimed at determining and mapping the within-field variation of soil physical and chemical properties and grain yield of oats, rye, oats and triticale in 2001, 2002, 2003, 2015, respectively. The experiment was set up in a field (200\u00a0\u00d7\u00a050\u00a0m) on sandy soil in Trzebieszow (region Podlasie, Poland). The soil measurements included sand, silt, clay, and organic carbon (SOC) contents, cation exchange capacity (CEC), pH in the topsoil (0\u201310\u00a0cm) and subsoil (30\u201340\u00a0cm) layers in 2001, and water content and bulk density in the topsoil layer in spring and summer 2002\u20132003. The yields of oats were assessed in 2001 and 2003 and those of rye and triticale in 2002 and 2015, respectively. The soil properties and cereal yields were determined at 33\u201355 points in a grid evenly covering the whole field area. The results were analyzed using classic statistics and geostatistics by constructing semivariograms and 2D mapping by Inverse Distance Weighting (IDW). The cereal grain yields were significantly positively correlated with the topsoil water content (SWC) (r\u00a0=\u00a00.295\u20130.711), clay content (r\u00a0=\u00a00.081\u20130.174), and SOC in the subsoil (r\u00a0=\u00a00.208\u20130.271) and CEC in both layers (r\u00a0=\u00a00.123\u20130.298) and negatively correlated with bulk density (BD) (r\u00a0=\u00a0\u20130.065 to \u22120.279). The spatial dependence determined by the \u201cnugget-to-sill\u201d ratio was moderate or weak for the silt and clay content, CEC, and pH (29\u201379%) and strong for SOC, BD, SWC, and crop yield (0.2\u201313.2%). The effective range of the spatial dependence for all studied quantities varied from 9.9 to 120\u00a0m. The cereal yields were positively and significantly correlated between all study years (r\u00a0=\u00a00.141\u20130.734), which indicates inter-annual similarity in their spatial distribution. The 2D maps based on the IDW allowed assessing how gradual or sharp the changes in the studied quantities from one place to another are. Similar spatial patterns of the SWC, SOC and CEC, and crop yields were observed. This is of importance in precise and sustainable field management aimed at increasing and aligning spatial crop productivity of the studied low-productivity sandy soils that will have to be used in crop production due to the current shortage of land resources and food supplies on a global scale.", "keywords": ["2. Zero hunger", "2D maps", "soil properties", "sandy soil", "spatial variation", "0401 agriculture", " forestry", " and fisheries", "cereal yield", "04 agricultural and veterinary sciences", "semivariograms", "15. Life on land"]}, "links": [{"href": "https://doi.org/10.1016/j.still.2017.07.015"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.still.2017.07.015", "name": "item", "description": "10.1016/j.still.2017.07.015", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.still.2017.07.015"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-12-01T00:00:00Z"}}, {"id": "10.1111/nph.20401", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:18:05Z", "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<p> <p>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.</p> <p>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.</p> <p>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.</p> <p>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.</p> </p", "keywords": ["rain-forest", "tree stem", "Nitrous Oxide", "spatial variation", "soil", "Trees", "Soil", "climate", "Biology", "Tropical Climate", "nitrous oxide", "subdaily variations", "Plant Stems", "methane", "exchange", "emissions", "temperature", "carbon dioxide", "Water", "Carbon Dioxide", "co2 efflux rates", "flux", "upland tropical forest", "soil co2", "living trees", "Seasons", "Methane", "respiration"], "contacts": [{"organization": "La\u00ebtitia M. Br\u00e9chet, Roberto L. Salom\u03ccn, Katerina Machacova, Cl\u00e9ment Stahl, Beno\u00eet Burban, Jean\u2010Yves Goret, Kathy Steppe, Damien Bonal, Ivan A. Janssens,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1111/nph.20401"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/New%20Phytologist", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/nph.20401", "name": "item", "description": "10.1111/nph.20401", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/nph.20401"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2025-01-17T00:00:00Z"}}, {"id": "10.5194/bg-16-785-2019", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:19:52Z", "type": "Journal Article", "created": "2019-02-12", "title": "Automatic high-frequency measurements of full soil greenhouse gas fluxes in a tropical forest", "description": "<p>Abstract. Measuring in situ soil fluxes of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) continuously at high frequency requires appropriate technology. We tested the combination of a commercial automated soil CO2 flux chamber system (LI-8100A) with a CH4 and N2O analyzer (Picarro G2308) in a tropical rainforest for 4\uffc2\uffa0months. A chamber closure time of 2\uffe2\uff80\uff89min was sufficient for a reliable estimation of CO2 and CH4 fluxes (100\uffe2\uff80\uff89% and 98.5\uffe2\uff80\uff89% of fluxes were above minimum detectable flux \uffe2\uff80\uff93 MDF, respectively). This closure time was generally not suitable for a reliable estimation of the low N2O fluxes in this ecosystem but was sufficient for detecting rare major peak events. A closure time of 25\uffe2\uff80\uff89min was more appropriate for reliable estimation of most N2O fluxes (85.6\uffe2\uff80\uff89% of measured fluxes are above MDF\uffe2\uff80\uff89\uffc2\uffb1\uffe2\uff80\uff890.002\uffe2\uff80\uff89nmol\uffe2\uff80\uff89m\uffe2\uff88\uff922\uffe2\uff80\uff89s\uffe2\uff88\uff921). Our study highlights the importance of adjusted closure time for each gas.                     </p>", "keywords": ["rain-forest", "nitrous-oxide", "Environmental management", "550", "[SDV]Life Sciences [q-bio]", "spatial variation", "01 natural sciences", "630", "land-use change", "Life", "QH501-531", "Meteorology & Atmospheric Sciences", "biogeochemical controls", "Physical geography and environmental geoscience", "Biology", "QH540-549.5", "0105 earth and related environmental sciences", "QE1-996.5", "Ecology", "Physics", "n2o", "emissions", "land-use change ; nitrous-oxide ; rain-forest ;biogeochemical controls ; chamber measurements ; spatial variation ; co2 ;emissions; n2o ; respiration", "Geology", "04 agricultural and veterinary sciences", "Biological Sciences", "15. Life on land", "Climate Action", "[SDV] Life Sciences [q-bio]", "Chemistry", "13. Climate action", "Earth Sciences", "co2", "0401 agriculture", " forestry", " and fisheries", "chamber measurements", "Climate Change Impacts and Adaptation", "Environmental Sciences", "respiration"]}, "links": [{"href": "https://bg.copernicus.org/articles/16/785/2019/bg-16-785-2019.pdf"}, {"href": "https://escholarship.org/content/qt73p9116t/qt73p9116t.pdf"}, {"href": "https://doi.org/10.5194/bg-16-785-2019"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.5194/bg-16-785-2019", "name": "item", "description": "10.5194/bg-16-785-2019", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5194/bg-16-785-2019"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-08-15T00:00:00Z"}}, {"id": "10.5061/dryad.8382j4r", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:19:44Z", "type": "Dataset", "title": "Data from: Spatial variation and linkages of soil and vegetation in the Siberian Arctic tundra \u2013 coupling field observations with remote sensing data", "description": "unspecifiedPlant, soil and remote  sensing attributes of a Siberian Arctic sitePlant and soil data of  study plots were collected in the field in summer 2014. NDVI and  topographical attributes were later extracted from three satellite images,  portraying the field site and vegetation in three different years at 180,  220 and 750 DD (growing degree days with 0 C threshold). Plant species  presence (1 in data) and absence (0 in data) in study plots is available  for dicotyledonous vascular plants. Land cover types are based on  ground-based visual judgement.Mikola et al.  2018_Biogeosciences.xlsx", "keywords": ["Vascular plant", "Satellite image", "soil temperature", "reflectance", "Permafrost", "spatial variation", "Spatial extrapolation", "Salix", "15. Life on land", "Betula nana", "moss", "Ecosystem carbon exchange", "LAI", "Sphagnum", "Carex", "Eriophorum", "13. Climate action", "Land cover type"], "contacts": [{"organization": "Mikola, Juha, Virtanen, Tarmo, Linkosalmi, Maiju, V\u00e4h\u00e4, Emmi, Nyman, Johanna, Postanogova, Olga, R\u00e4s\u00e4nen, Aleksi, Kotze, D. Johan, Laurila, Tuomas, Juutinen, Sari, Kondratyev, Vladimir, Aurela, Mika,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.5061/dryad.8382j4r"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.8382j4r", "name": "item", "description": "10.5061/dryad.8382j4r", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.8382j4r"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2019-05-04T00:00:00Z"}}, {"id": "10067/1574910151162165141", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:21:52Z", "type": "Journal Article", "created": "2019-02-12", "title": "Automatic high-frequency measurements of full soil greenhouse gas fluxes in a tropical forest", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>Abstract. Measuring in situ soil fluxes of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) continuously at high frequency requires appropriate technology. We tested the combination of a commercial automated soil CO2 flux chamber system (LI-8100A) with a CH4 and N2O analyzer (Picarro G2308) in a tropical rainforest for 4\u00a0months. A chamber closure time of 2\u2009min was sufficient for a reliable estimation of CO2 and CH4 fluxes (100\u2009% and 98.5\u2009% of fluxes were above minimum detectable flux \u2013 MDF, respectively). This closure time was generally not suitable for a reliable estimation of the low N2O fluxes in this ecosystem but was sufficient for detecting rare major peak events. A closure time of 25\u2009min was more appropriate for reliable estimation of most N2O fluxes (85.6\u2009% of measured fluxes are above MDF\u2009\u00b1\u20090.002\u2009nmol\u2009m\u22122\u2009s\u22121). Our study highlights the importance of adjusted closure time for each gas.</p></article>", "keywords": ["rain-forest", "nitrous-oxide", "Environmental management", "550", "[SDV]Life Sciences [q-bio]", "spatial variation", "01 natural sciences", "630", "Meteorology & Atmospheric Sciences (science-metrix)", "3103 Ecology (for-2020)", "land-use change", "Life", "QH501-531", "4101 Climate Change Impacts and Adaptation (for-2020)", "Meteorology & Atmospheric Sciences", "04 Earth Sciences (for)", "biogeochemical controls", "Physical geography and environmental geoscience", "Biology", "QH540-549.5", "0105 earth and related environmental sciences", "QE1-996.5", "31 Biological Sciences (for-2020)", "41 Environmental Sciences (for-2020)", "Ecology", "Physics", "n2o", "emissions", "land-use change ; nitrous-oxide ; rain-forest ;biogeochemical controls ; chamber measurements ; spatial variation ; co2 ;emissions; n2o ; respiration", "Geology", "04 agricultural and veterinary sciences", "Biological Sciences", "15. Life on land", "4104 Environmental management (for-2020)", "06 Biological Sciences (for)", "Climate Action", "[SDV] Life Sciences [q-bio]", "Chemistry", "13. Climate action", "Earth Sciences", "co2", "0401 agriculture", " forestry", " and fisheries", "13 Climate Action (sdg)", "chamber measurements", "Climate Change Impacts and Adaptation", "3709 Physical geography and environmental geoscience (for-2020)", "Environmental Sciences", "05 Environmental Sciences (for)", "respiration"]}, "links": [{"href": "https://bg.copernicus.org/articles/16/785/2019/bg-16-785-2019.pdf"}, {"href": "https://escholarship.org/content/qt73p9116t/qt73p9116t.pdf"}, {"href": "https://doi.org/10067/1574910151162165141"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Biogeosciences", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10067/1574910151162165141", "name": "item", "description": "10067/1574910151162165141", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10067/1574910151162165141"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-08-15T00:00:00Z"}}, {"id": "10067/1974270151162165141", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-09-22T16:21:52Z", "type": "Journal Article", "created": "2023-05-10", "title": "Tree stem and soil methane and nitrous oxide fluxes, but not carbon dioxide fluxes, switch sign along a topographic gradient in a tropical forest", "description": "Purpose<br/>Tropical forests exchange large amounts of greenhouse gases (GHGs: carbon dioxide, CO2; methane, CH4; and nitrous oxide, N2O) with the atmosphere. Forest soils and stems can be either sources or sinks for CH4 and N2O, but little is known about what determines the sign and magnitude of these fluxes. Here, we aimed to study how stem and soil GHG fluxes vary along a topographic gradient in a tropical forest.<br/><br/>Methods<br/>Fluxes of GHG from 56 individual tree stems and adjacent soils were measured with manual static chambers. The topographic gradient was characterized by a soil moisture gradient, with one end in a wetland area (\u201cseasonally flooded\u201d; SF), the other end in an upland area (\u201cterra firme\u201d; TF) and in between a transitional area on the slope (SL).<br/><br/>Results<br/>Tree stems and soils were always sources of CO2 with higher fluxes in SF compared to TF and SL. Fluxes of CH4 and N2O were more variable, even within one habitat. Results showed that, in TF, soils acted as sinks for N2O whereas, in SF and SL, they acted as sources. In contrast, tree stems which were predominantly sources of N2O in SF and TF, were sinks in SL. In the soil, N2O fluxes were significantly influenced by both temperature and soil water content, whereas CH4 fluxes were only significantly correlated with soil water content.<br/><br/>Conclusion<br/>SF areas were major sources of the three gases, whereas SL and TF soils and tree stems acted as either sources or sinks for CH4 and N2O. Our results indicate that tree stems represent overlooked sources of CH4 and N2O in tropical forests that need to be further studied to refine GHG budgets.", "keywords": ["[SDV.SA.AGRO] Life Sciences [q-bio]/Agricultural sciences/Agronomy", "106022 Mikrobiologie", "550", "source", "Spatial variation", "Sink", "[SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy", "spatial variation", "Source", "15. Life on land", "Stem", "630", "soil", "[SDV.GEN.GPL]Life Sciences [q-bio]/Genetics/Plants genetics", "Soil", "Greenhouse gas (GHG) exchange", "13. Climate action", "106026 \u00d6kosystemforschung", "[SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants genetics", "106022 Microbiology", "stem", "sink", "106026 Ecosystem research", "Biology", "greenhouse gas (GHG) exchange"]}, "links": [{"href": "https://doi.org/10067/1974270151162165141"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10067/1974270151162165141", "name": "item", "description": "10067/1974270151162165141", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10067/1974270151162165141"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2023-05-09T00:00:00Z"}}, {"id": "11104/0365439", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:22:08Z", "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<p> <p>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.</p> <p>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.</p> <p>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.</p> <p>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.</p> </p", "keywords": ["rain-forest", "tree stem", "Nitrous Oxide", "spatial variation", "soil", "Trees", "Soil", "[SDV.GEN.GPL] Life Sciences [q-bio]/Genetics/Plants genetics", "climate", "Biology", "Tropical Climate", "nitrous oxide", "subdaily variations", "Plant Stems", "methane", "exchange", "emissions", "temperature", "carbon dioxide", "Water", "Carbon Dioxide", "co2 efflux rates", "flux", "upland tropical forest", "soil co2", "living trees", "Seasons", "Methane", "respiration"]}, "links": [{"href": "https://doi.org/11104/0365439"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/New%20Phytologist", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "11104/0365439", "name": "item", "description": "11104/0365439", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/11104/0365439"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2025-01-17T00:00:00Z"}}, {"id": "2745857202", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:22:47Z", "type": "Journal Article", "created": "2017-08-23", "title": "Spatial variability of soil properties and cereal yield in a cultivated field on sandy soil", "description": "Abstract   Sandy soils are used in agriculture in different regions of the world. In Poland soils derived from sands occupy about 50% of agricultural area. Productivity of the soils depend on the soil properties that vary in the scale of field. This study aimed at determining and mapping the within-field variation of soil physical and chemical properties and grain yield of oats, rye, oats and triticale in 2001, 2002, 2003, 2015, respectively. The experiment was set up in a field (200\u00a0\u00d7\u00a050\u00a0m) on sandy soil in Trzebieszow (region Podlasie, Poland). The soil measurements included sand, silt, clay, and organic carbon (SOC) contents, cation exchange capacity (CEC), pH in the topsoil (0\u201310\u00a0cm) and subsoil (30\u201340\u00a0cm) layers in 2001, and water content and bulk density in the topsoil layer in spring and summer 2002\u20132003. The yields of oats were assessed in 2001 and 2003 and those of rye and triticale in 2002 and 2015, respectively. The soil properties and cereal yields were determined at 33\u201355 points in a grid evenly covering the whole field area. The results were analyzed using classic statistics and geostatistics by constructing semivariograms and 2D mapping by Inverse Distance Weighting (IDW). The cereal grain yields were significantly positively correlated with the topsoil water content (SWC) (r\u00a0=\u00a00.295\u20130.711), clay content (r\u00a0=\u00a00.081\u20130.174), and SOC in the subsoil (r\u00a0=\u00a00.208\u20130.271) and CEC in both layers (r\u00a0=\u00a00.123\u20130.298) and negatively correlated with bulk density (BD) (r\u00a0=\u00a0\u20130.065 to \u22120.279). The spatial dependence determined by the \u201cnugget-to-sill\u201d ratio was moderate or weak for the silt and clay content, CEC, and pH (29\u201379%) and strong for SOC, BD, SWC, and crop yield (0.2\u201313.2%). The effective range of the spatial dependence for all studied quantities varied from 9.9 to 120\u00a0m. The cereal yields were positively and significantly correlated between all study years (r\u00a0=\u00a00.141\u20130.734), which indicates inter-annual similarity in their spatial distribution. The 2D maps based on the IDW allowed assessing how gradual or sharp the changes in the studied quantities from one place to another are. Similar spatial patterns of the SWC, SOC and CEC, and crop yields were observed. This is of importance in precise and sustainable field management aimed at increasing and aligning spatial crop productivity of the studied low-productivity sandy soils that will have to be used in crop production due to the current shortage of land resources and food supplies on a global scale.", "keywords": ["2. Zero hunger", "2D maps", "soil properties", "sandy soil", "spatial variation", "0401 agriculture", " forestry", " and fisheries", "cereal yield", "04 agricultural and veterinary sciences", "semivariograms", "15. Life on land"]}, "links": [{"href": "https://doi.org/2745857202"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "2745857202", "name": "item", "description": "2745857202", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2745857202"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-12-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=SPATIAL+VARIATION&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=SPATIAL+VARIATION&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=SPATIAL+VARIATION&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=SPATIAL+VARIATION&offset=13", "hreflang": "en-US"}], "numberMatched": 13, "numberReturned": 13, "distributedFeatures": [], "timeStamp": "2026-09-22T19:49:33.838854Z"}