{"type": "FeatureCollection", "features": [{"id": "10.1007/s00442-004-1540-4", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:39Z", "type": "Journal Article", "created": "2004-03-19", "title": "Feedback Interactions Between Needle Litter Decomposition And Rhizosphere Activity", "description": "The aim of our study was to identify interactions between the decomposition of aboveground litter and rhizosphere activity. The experimental approach combined the placement of labelled litter (delta13C=-37.9 per thousand ) with forest girdling in a 35-year-old Norway spruce stand, resulting in four different treatment combinations: GL (girdled, litter), GNL (girdled, no litter), NGL (not girdled, litter), and NGNL (not girdled, no litter). Monthly sampling of soil CO2 efflux and delta13C of soil respired CO2 between May and October 2002 allowed the partitioning of the flux into that derived from the labelled litter, and that derived from native soil organic matter and roots. The effect of forest girdling on soil CO2 efflux was detectable from June (girdling took place in April), and resulted in GNL fluxes to be about 50% of NGNL fluxes by late August. The presence of litter resulted in significantly increased fluxes for the first 2 months of the experiment, with significantly greater litter derived fluxes from non-girdled plots and a significant interaction between girdling and litter treatments over the same period. For NGL collars, the additional efflux was found to originate only in part from litter decomposition, but also from the decay of native soil organic matter. In GL collars, this priming effect was not significant, indicating an active role of the rhizosphere in soil priming. The results therefore indicate mutual positive feedbacks between litter decomposition and rhizosphere activity. Soil biological analysis (microbial and fungal biomass) of the organic layers indicated greatest activity below NGL collars, and we suppose that this increase indicates the mechanism of mutual positive feedback between rhizosphere activity and litter decomposition. However, elimination of fresh C input from both above- and belowground (GNL) also resulted in greater fungal abundance than for the NGNL treatment, indicating likely changes in fungal community structure (i.e. a shift from symbiotic to saprotrophic species abundance).", "keywords": ["570", "Soil ecology", "Microbial biomass", "Models", " Biological", "630", "Soil", "Biomass", "Picea", "Forest girdling; Microbial biomass; Soil CO; 2; efflux; Soil organic matter; Stable C isotopes;", "Ecosystem", "Soil Microbiology", "Soil CO2 efflux", "Feedback", " Physiological", "Soil organic matter", "Carbon Isotopes", "Fungi", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "Microbial growth", "Stable C isotopes", "Plant Leaves", "13. Climate action", "Soils", "0401 agriculture", " forestry", " and fisheries", "Forest girdling", "Seasons"]}, "links": [{"href": "https://doi.org/10.1007/s00442-004-1540-4"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00442-004-1540-4", "name": "item", "description": "10.1007/s00442-004-1540-4", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00442-004-1540-4"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2004-05-01T00:00:00Z"}}, {"id": "10.1007/s00442-006-0381-8", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:40Z", "type": "Journal Article", "created": "2006-02-17", "description": "The aspen free-air CO2 and O3 enrichment (FACTS II-FACE) study in Rhinelander, Wisconsin, USA, is designed to understand the mechanisms by which young northern deciduous forest ecosystems respond to elevated atmospheric carbon dioxide (CO2) and elevated tropospheric ozone (O3) in a replicated, factorial, field experiment. Soil respiration is the second largest flux of carbon (C) in these ecosystems, and the objective of this study was to understand how soil respiration responded to the experimental treatments as these fast-growing stands of pure aspen and birch + aspen approached maximum leaf area. Rates of soil respiration were typically lowest in the elevated O3 treatment. Elevated CO2 significantly stimulated soil respiration (8-26%) compared to the control treatment in both community types over all three growing seasons. In years 6-7 of the experiment, the greatest rates of soil respiration occurred in the interaction treatment (CO2 + O3), and rates of soil respiration were 15-25% greater in this treatment than in the elevated CO2 treatment, depending on year and community type. Two of the treatments, elevated CO2 and elevated CO2 + O3, were fumigated with 13C-depleted CO2, and in these two treatments we used standard isotope mixing models to understand the proportions of new and old C in soil respiration. During the peak of the growing season, C fixed since the initiation of the experiment in 1998 (new C) accounted for 60-80% of total soil respiration. The isotope measurements independently confirmed that more new C was respired from the interaction treatment compared to the elevated CO2 treatment. A period of low soil moisture late in the 2003 growing season resulted in soil respiration with an isotopic signature 4-6 per thousand enriched in 13C compared to sample dates when the percentage soil moisture was higher. In 2004, an extended period of low soil moisture during August and early September, punctuated by a significant rainfall event, resulted in soil respiration that was temporarily 4-6 per thousand more depleted in 13C. Up to 50% of the Earth's forests will see elevated concentrations of both CO2 and O3 in the coming decades and these interacting atmospheric trace gases stimulated soil respiration in this study.", "keywords": ["0106 biological sciences", "Science", "Ecology and Evolutionary Biology", "Cell Respiration", "Acer", "Carbon Cycling", "Plant Roots", "01 natural sciences", "Trees", "Soil", "Ozone", "Stable Isotope", "Air Pollution", "Health Sciences", "\u03b4 13 C", "Global Change", "Cellular and Developmental Biology", "Betula", "Ecosystem", "Soil Microbiology", "Carbon Isotopes", "Atmosphere", "Natural Resources and Environment", "Molecular", "Carbon Dioxide", "15. Life on land", "Populus", "13. Climate action"]}, "links": [{"href": "https://doi.org/10.1007/s00442-006-0381-8"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00442-006-0381-8", "name": "item", "description": "10.1007/s00442-006-0381-8", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00442-006-0381-8"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2006-02-18T00:00:00Z"}}, {"id": "10.1002/jsfa.4647", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:13Z", "type": "Journal Article", "created": "2011-09-27", "title": "Response Of Soil Organic Carbon Mineralization In Typical Karst Soils Following The Addition Of 14c-Labeled Rice Straw And Caco3", "description": "Abstract

BACKGROUND: Organic substrates and calcium are important factors controlling organic matter turnover in Karst soils. To understand their effects on soil organic carbon (SOC) mineralization, an incubation experiment was conducted involving a control treatment (CK), the addition of a 14C\uffe2\uff80\uff90labeled rice straw (T1), CaCO3 (T2), and both 14C\uffe2\uff80\uff90labeled rice straw and CaCO3 (T3) to two types of Karst soils (terra fusca and rendzina) and a red soil from southwestern China.

RESULTS: Cumulative mineralization of the rice straw over 100 days in rendzina (22.96 mg kg\uffe2\uff88\uff921) and terra fusca (23.19 mg kg\uffe2\uff88\uff921) was higher than in the red soil (15.48 mg kg\uffe2\uff88\uff921; P < 0.05). Cumulative mineralization of native SOC decreased following addition of 14C\uffe2\uff80\uff90labeled rice straw in the rendzina and terra fusca but increased in the red soil (negative and positive priming effects on native SOC). The turnover times of 14C\uffe2\uff80\uff90labeled microbial biomass C (MBC) in the red soil, terra fusca and rendzina were 71 \uffc2\uffb1 2, 243 \uffc2\uffb1 20 and 254 \uffc2\uffb1 45 days, respectively. By adding CaCO3, the accumulation of SOC was greater in the Karst soils than in the red soil.

CONCLUSION: Although the interactions between rice straw decomposition and priming effects on native SOC are not yet understood, there was considerable variation between Karst and red soils. Soil calcium was a positive factor in maintaining SOC stability. MBC from rice straws was stable in terra fusca and rendzina, whereas it was active in the red soil. The Karst soils (terra fusca and rendzina) used in this study benefited SOC accumulation. Copyright \uffc2\uffa9 2011 Society of Chemical Industry

", "keywords": ["2. Zero hunger", "Carbon Isotopes", "Soil", "0401 agriculture", " forestry", " and fisheries", "Calcium", "Oryza", "04 agricultural and veterinary sciences", "15. Life on land", "Carbon", "Soil Microbiology", "6. Clean water", "Calcium Carbonate", "Carbon Cycle"]}, "links": [{"href": "https://doi.org/10.1002/jsfa.4647"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20the%20Science%20of%20Food%20and%20Agriculture", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/jsfa.4647", "name": "item", "description": "10.1002/jsfa.4647", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/jsfa.4647"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-09-23T00:00:00Z"}}, {"id": "10.1002/rcm.1184", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:16Z", "type": "Journal Article", "created": "2003-12-02", "title": "Quantification Of Priming And Co2 Respiration Sources Following Slurry-C Incorporation Into Two Grassland Soils With Different C Content", "description": "Abstract

The fate of incorporated slurry\uffe2\uff80\uff90C was examined in a laboratory experiment using two UK grassland soils, i.e. a Pelostagnogley (5.1 %C) and a Brown Earth (2.3 %C). C3 and C4 slurries were incorporated into these two wet\uffe2\uff80\uff90sieved (C3) soils (from 4\uffe2\uff80\uff9310 cm depth). Gas samples were collected 0.2, 1, 2, 3, 4, 6, 9, 20, 30 and 40 days after slurry application and analyzed for CO2 concentration and \uffce\uffb413C content. Slurry incorporation into the soil strongly increased soil CO2 respiration compared with the unamended soil. Total (40 day) cumulative CO2 flux was higher for the Pelostagnogley than the Brown Earth. The 13C natural abundance tracer technique enabled quantification of the sources of respired CO2 and priming effects (days 0\uffe2\uff80\uff939). Proportionally more slurry\uffe2\uff80\uff90derived C was respired from the Pelostagnogley (46%) than the Brown Earth (36%). The incorporated slurry\uffe2\uff80\uff90C was lost twice as fast as the native soil C in both soils. Slurry incorporation induced a priming effect, i.e. additional release of soil\uffe2\uff80\uff90derived C, most pronounced in the Pelostagnogley (highest C content). The majority of respired soil\uffe2\uff80\uff90derived C (>70%) was primed C. The study indicated that potential reductions in ammonia volatilisation following slurry injection to grasslands might be negated by enhanced loss of primed soil C (i.e. pollution swapping). Copyright \uffc2\uffa9 2003 John Wiley & Sons, Ltd.

", "keywords": ["2. Zero hunger", "Carbon Isotopes", "Agriculture", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "Poaceae", "Waste Disposal", " Fluid", "Carbon", "Mass Spectrometry", "6. Clean water", "Soil", "England", "Animals", "0401 agriculture", " forestry", " and fisheries", "Cattle"]}, "links": [{"href": "https://doi.org/10.1002/rcm.1184"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Rapid%20Communications%20in%20Mass%20Spectrometry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1002/rcm.1184", "name": "item", "description": "10.1002/rcm.1184", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1002/rcm.1184"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2003-10-30T00:00:00Z"}}, {"id": "10.1890/10-2076.1", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:20:47Z", "type": "Journal Article", "created": "2011-04-29", "title": "No Evidence That Chronic Nitrogen Additions Increase Photosynthesis In Mature Sugar Maple Forests", "description": "Atmospheric nitrogen (N) deposition can increase forest growth. Because N deposition commonly increases foliar N concentrations, it is thought that this increase in forest growth is a consequence of enhanced leaf-level photosynthesis. However, tests of this mechanism have been infrequent, and increases in photosynthesis have not been consistently observed in mature forests subject to chronic N deposition. In four mature northern hardwood forests in the north-central United States, chronic N additions (30 kg N ha(-1) yr(-1) as NaNO3 for 14 years) have increased aboveground growth but have not affected canopy leaf biomass or leaf area index. In order to understand the mechanism behind the increases in growth, we hypothesized that the NO3(-) additions increased foliar N concentrations and leaf-level photosynthesis in the dominant species in these forests (sugar maple, Acer saccharum). The NO3(-) additions significantly increased foliar N. However, there was no significant difference between the ambient and +NO3(-) treatments in two seasons (2006-2007) of instantaneous measurements of photosynthesis from either canopy towers or excised branches. In measurements on excised branches, photosynthetic nitrogen use efficiency (micromol CO2 s(-1) g(-1) N) was significantly decreased (-13%) by NO3(-) additions. Furthermore, we found no consistent NO3(-) effect across all sites in either current foliage or leaf litter collected annually throughout the study (1993-2007) and analyzed for delta 13C and delta 18O, isotopes that can be used together to integrate changes in photosynthesis over time. We observed a small but significant NO3(-) effect on the average area and mass of individual leaves from the excised branches, but these differences varied by site and were countered by changes in leaf number. These photosynthesis and leaf area data together suggest that NO3(-) additions have not stimulated photosynthesis. There is no evidence that nutrient deficiencies have developed at these sites, so unlike other studies of photosynthesis in N-saturated forests, we cannot attribute the lack of a stimulation of photosynthesis to nutrient limitations. Rather than increases in C assimilation, the observed increases in aboveground growth at our study sites are more likely due to shifts in C allocation.", "keywords": ["0106 biological sciences", "Carbon Isotopes", "Michigan", "Nitrates", "Time Factors", "Nitrogen", "Acer", "04 agricultural and veterinary sciences", "Oxygen Isotopes", "15. Life on land", "01 natural sciences", "Carbon", "Trees", "Oxygen", "Plant Leaves", "0401 agriculture", " forestry", " and fisheries", "Photosynthesis", "Fertilizers"]}, "links": [{"href": "https://doi.org/10.1890/10-2076.1"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecological%20Applications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1890/10-2076.1", "name": "item", "description": "10.1890/10-2076.1", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1890/10-2076.1"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-10-01T00:00:00Z"}}, {"id": "10.1007/s00442-003-1391-4", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:39Z", "type": "Journal Article", "created": "2003-12-10", "title": "Carbon Availability Controls The Growth Of Detritivores (Lumbricidae) And Their Effect On Nitrogen Mineralization", "description": "Activity of soil decomposer microorganisms is generally limited by carbon availability, but factors controlling saprophagous soil animals remain largely unknown. In contrast to microorganisms, animals are unable to exploit mineral nutrient pools. Therefore, it has been suggested that soil animals, and earthworms in particular, are limited by the availability of nitrogen. In contrast to this view, a strong increase in density and biomass of endogeic earthworms in response to labile organic carbon addition has been documented in field experiments. The hypothesis that the growth of endogeic earthworms is primarily limited by carbon availability was tested in a laboratory experiment lasting for 10 weeks. In addition, it was investigated whether the effects of earthworms on microbial activity and nutrient mineralization depend on the availability of carbon resources. We manipulated food availability to the endogeic earthworm species Octolasion tyrtaeum by using two soils with different organic matter content, providing access to different amounts of soil, and adding labile organic carbon (glucose) enriched in (13)C. Glucose addition strongly increased the growth of O. tyrtaeum. From 8 to 17% of the total C in earthworm tissue was assimilated from the glucose added. Soil microbial biomass was not strongly affected by the addition of glucose, though basal respiration was significantly increased and up to 50% of the carbon added as glucose was incorporated into soil organic matter. The impact of earthworms on the mineralization and leaching of nitrogen depended on C availability. As expected, in C-limited soil, the presence of earthworms strongly increased nitrogen leaching. However, when C availability was increased by the addition of glucose, this pattern was reversed, i.e. the presence of O. tyrtaeum decreased nitrogen leaching and its availability to soil microflora. We conclude that irrespective of the total carbon content of soils, O. tyrtaeum was primarily limited by carbon, and that increased carbon availability allowed earthworms to be more effective in mobilizing N. The presence of earthworms increases C limitation of soil microorganisms, due to increased availability of N and P in earthworm casts or a direct depletion of easily available carbon resources by earthworms.", "keywords": ["0106 biological sciences", "2. Zero hunger", "Carbon Isotopes", "Nitrogen", "Population Dynamics", "Biological Availability", "Phosphorus", "04 agricultural and veterinary sciences", "15. Life on land", "01 natural sciences", "Carbon", "Soil", "Animals", "0401 agriculture", " forestry", " and fisheries", "Oligochaeta", "Soil Microbiology"]}, "links": [{"href": "https://doi.org/10.1007/s00442-003-1391-4"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00442-003-1391-4", "name": "item", "description": "10.1007/s00442-003-1391-4", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00442-003-1391-4"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2004-01-01T00:00:00Z"}}, {"id": "10.1007/s00442-009-1490-y", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:40Z", "type": "Journal Article", "created": "2010-03-06", "title": "Frequent Fire Affects Soil Nitrogen And Carbon In An African Savanna By Changing Woody Cover", "description": "When tropical and sub-tropical ecosystems burn, considerable amounts of N present in the biomass fuel may be released. This ultimately results in a loss of fixed N to the atmosphere. It is often assumed that this volatilization loss of N with frequent fire will result in a reduction of plant-available N and total system N. By changing the amount of woody biomass fire may, however, also have indirect effects on N and C dynamics. Here we consider the effects of 50 years of frequent fire on total soil N and soil organic C (SOC) and total soil N in a mesic savanna in the Kruger National Park, South Africa. We also determine how changes in woody biomass may affect total soil N and SOC. We measured soil and fine root N and C concentrations as well as total soil N and SOC pools in four burning treatments, including fire exclusion, of a long-term fire experiment. Our results show that regardless of soil depth, fire treatment had no significant effect on total soil N and SOC. Our results also show that under trees total soil N and SOC concentrations of the surface soil increase, and pools of N and SOC increase to a depth of 7 cm. However, the extent to which soil N and C dynamics differed under canopies and away from canopies was dependent on fire treatment. Our results show that the effect of fire on soil N and C is mediated both through the indirect effect of changes in woody cover and the direct effects of fire (volatilization losses of nutrients). We suggest that woody thickening in this mesic savanna will have pronounced effects on long-term N and C dynamics.", "keywords": ["0106 biological sciences", "Carbon Isotopes", "Time Factors", "Nitrogen Isotopes", "Nitrogen", "Rain", "04 agricultural and veterinary sciences", "15. Life on land", "Wood", "01 natural sciences", "Carbon", "Fires", "Trees", "Soil", "South Africa", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Seasons", "Volatilization", "Ecosystem", "Soil Microbiology"]}, "links": [{"href": "https://doi.org/10.1007/s00442-009-1490-y"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00442-009-1490-y", "name": "item", "description": "10.1007/s00442-009-1490-y", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00442-009-1490-y"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-03-07T00:00:00Z"}}, {"id": "10.1007/s00442-015-3290-x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:41Z", "type": "Journal Article", "created": "2015-03-19", "title": "The Priming Effect Of Soluble Carbon Inputs In Organic And Mineral Soils From A Temperate Forest", "description": "The priming effect (PE) is one of the most important interactions between C input and output in soils. Here we aim to quantify patterns of PE in response to six addition rates of (13)C-labeled water-soluble C (WSC) and determine if these patterns are different between soil organic and mineral layers in a temperate forest. Isotope mass balance was used to distinguish WSC derived from SOC-derived CO2 respiration. The relative PE was 1.1-3.3 times stronger in the mineral layer than in the organic layer, indicating higher sensitivity of the mineral layer to WSC addition. However, the magnitude of cumulative PE was significantly higher in the organic layer than in the mineral layer due to higher SOC in the organic layer. With an increasing WSC addition rate, cumulative PE increased for both layers, but tended to level off when the addition rate was higher than 400 mg C kg(-1) soil. This saturation effect indicates that stimulation of soil C loss by exogenous substrate would not be as drastic as the increase of C input. In fact, we found that the mineral layer with an WSC addition rate of 160-800 mg C kg(-1) soil had net C storage although positive PE was observed. The addition of WSC basically caused net C loss in the organic layer due to the high magnitude of PE, pointing to the importance of the organic layer in C cycling of forest ecosystems. Our findings provide a fundamental understanding of PE on SOC mineralization of forest soils and warrant further in situ studies of PE in order to better understand C cycling under global climate change.", "keywords": ["Carbon Isotopes", "Minerals", "Climate", "Climate Change", "04 agricultural and veterinary sciences", "Carbon Dioxide", "Forests", "15. Life on land", "Carbon", "Carbon Cycle", "Trees", "Soil", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Biomass", "Betula", "Ecosystem"]}, "links": [{"href": "https://doi.org/10.1007/s00442-015-3290-x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Oecologia", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s00442-015-3290-x", "name": "item", "description": "10.1007/s00442-015-3290-x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s00442-015-3290-x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-03-20T00:00:00Z"}}, {"id": "10.1007/s10533-004-0368-7", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:14:53Z", "type": "Journal Article", "created": "2005-05-09", "title": "Regional Variation In Soil Carbon And \u039413c In Forests And Pastures Of Northeastern Costa Rica", "description": "Recent studies suggest that the direction and magnitude of changes in soil organic carbon (soil C) pools following forest-to-pasture conversion in the tropics are dependent upon initial soil conditions and local factors (e.g. pre-conversion soil C content, soil texture, vegetation productivity, and management practices). The goal of this study was to understand how landscape-scale variation in soil-forming factors influenced the response of soil C pools to forest clearing and pasture establishment in northeastern Costa Rica. We measured soil C and its stable isotopic composition in 24 paired pasture and reference forest sites distributed over large gradients of edaphic characteristics and slope throughout a 1400 km2 region. We used the large difference in stable C isotopic signatures of C3 vegetation (rain forest) versus C4 vegetation (pasture grasses) as a tracer of soil C dynamics. Soil C pools to 30 cm depth ranged from 26% lower to 23% higher in pastures compared to paired forests. The presence of non-crystalline clays and percent slope explained between 27 and 37% of the variation in the direction and magnitude of the changes in soil C storage following pasture establishment. Stable carbon isotopes (\u03b413C) in the top soil (0\u201310 cm) showed a rapid incorporation of pasture-derived C following pasture establishment, but the vegetation in these pastures never became pure C4 communities. The amount of forest-derived soil C in pasture topsoils (0\u201310 cm) was negatively correlated to both pasture age and the concentrations of non-crystalline iron oxides. Together these results imply that site factors such as soil mineralogy are an important control over soil C storage and turnover in this region.", "keywords": ["2. Zero hunger", "Costa Rica; Land-use change; Pasture; Soil carbon; Stable carbon isotopes", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land"]}, "links": [{"href": "https://doi.org/10.1007/s10533-004-0368-7"}, {"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": "10.1007/s10533-004-0368-7", "name": "item", "description": "10.1007/s10533-004-0368-7", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10533-004-0368-7"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-02-01T00:00:00Z"}}, {"id": "10.1088/1748-9326/ac4f8d", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:18:55Z", "type": "Journal Article", "created": "2022-01-27", "title": "Seasonal variability in particulate organic carbon degradation in the Kolyma River, Siberia", "description": "Abstract

Major Arctic rivers are undergoing changes due to climate warming with higher discharge and increased amounts of solutes and organic carbon (OC) draining into rivers and coastal seas. Permafrost thaw mobilizes previously frozen OC to the fluvial network where it can be degraded into greenhouse gases and emitted to the atmosphere. Degradation of OC during downstream transport, especially of the particulate OC (POC), is however poorly characterized. Here, we quantified POC degradation in the Kolyma River, the largest river system underlain with continuous permafrost, during 9\uffe2\uff80\uff9315 d whole-water incubations (containing POC and dissolved OC\uffe2\uff80\uff94DOC) during two seasons: spring freshet (early June) and late summer (end of July). Furthermore, we examined interactions between dissolved and particulate phases using parallel incubations of filtered water (only DOC). We measured OC concentrations and carbon isotopes (\uffce\uffb413C, \uffce\uff9414C) to define carbon losses and to characterize OC composition, respectively. We found that both POC composition and biodegradability differs greatly between seasons. During summer, POC was predominantly autochthonous (47%\uffe2\uff80\uff9395%) and degraded rapidly (\uffe2\uff88\uffbc33% loss) whereas freshet POC was largely of allochthonous origin (77%\uffe2\uff80\uff9396%) and less degradable. Gains in POC concentrations (up to 31%) were observed in freshet waters that could be attributed to flocculation and adsorption of DOC to particles. The demonstrated DOC flocculation and adsorption to POC indicates that the fate and dynamics of the substantially-sized DOC pool may shift from degradation to settling, depending on season and POC concentrations\uffe2\uff80\uff94the latter potentially acting to attenuate greenhouse gas emissions from fluvial systems. We finally note that DOC incubations without POC present may yield degradation estimates that do not reflect degradation in the in situ river conditions, and that interaction between dissolved and particulate phases may be important to consider when determining fluvial carbon dynamics and feedbacks under a changing climate.M2 (0.4)>M1 (0.3) is in agreement with a significant influence of metals on the SOM turnover. New C4 SOM, mainly present in the labile coarser fractions and less contaminated by metals than the stabilised C3 SOM of the clay fraction, is more easily degraded by microorganisms.", "keywords": ["Geologic Sediments", "550", "Agronomie", "Nitrogen", "[SDV.SA.AGRO]Life Sciences [q-bio]/Agricultural sciences/Agronomy", "Zea mays", "01 natural sciences", "630", "Soil", "Soil organic matter dynamic", "Soil Pollutants", "Biomass", "Humic Substances", "0105 earth and related environmental sciences", "[SDV.SA.AGRO] Life Sciences [q-bio]/Agricultural sciences/Agronomy", "2. Zero hunger", "Carbon Isotopes", "Stable isotopic carbon ratio -", "Spectrophotometry", " Atomic", "Agriculture", "04 agricultural and veterinary sciences", "15. Life on land", "Size fractionation", "6. Clean water", "Zinc", "Biodegradation", " Environmental", "Lead", "Trace metal", "Metals", "Metallurgy", "0401 agriculture", " forestry", " and fisheries", "Environmental Pollution", "Copper", "Cadmium"]}, "links": [{"href": "https://oatao.univ-toulouse.fr/3839/1/Dumat_3839.pdf"}, {"href": "https://doi.org/10.1016/j.envpol.2005.10.027"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Environmental%20Pollution", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.envpol.2005.10.027", "name": "item", "description": "10.1016/j.envpol.2005.10.027", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.envpol.2005.10.027"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2006-08-01T00:00:00Z"}}, {"id": "10.1016/j.scitotenv.2013.03.090", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:17:04Z", "type": "Journal Article", "created": "2013-04-24", "title": "Microbial Utilisation Of Biochar-Derived Carbon", "description": "Whilst largely considered an inert material, biochar has been documented to contain a small yet significant fraction of microbially available labile organic carbon (C). Biochar addition to soil has also been reported to alter soil microbial community structure, and to both stimulate and retard the decomposition of native soil organic matter (SOM). We conducted a short-term incubation experiment using two (13)C-labelled biochars produced from wheat or eucalypt shoots, which were incorporated in an aridic arenosol to examine the fate of the labile fraction of biochar-C through the microbial community. This was achieved using compound specific isotopic analysis (CSIA) of phospholipid fatty acids (PLFAs). A proportion of the biologically-available fraction of both biochars was rapidly (within three days) utilised by gram positive bacteria. There was a sharp peak in CO2 evolution shortly after biochar addition, resulting from rapid turnover of labile C components in biochars and through positive priming of native SOM. Our results demonstrate that this CO2 evolution was at least partially microbially mediated, and that biochar application to soil can cause significant and rapid changes in the soil microbial community; likely due to addition of labile C and increases in soil pH.", "keywords": ["Carbon sequestration", "[SDE] Environmental Sciences", "Carbon Sequestration", "Chromatography", " Gas", "Magnetic Resonance Spectroscopy", "550", "short term", "[SDV]Life Sciences [q-bio]", "growth", "black carbon", "Char", "01 natural sciences", "630", "Mass Spectrometry", "c 13 plfa", "Black carbon", "soil organic matter", "Soil Pollutants", "mineralization", "Organic carbon", "Phospholipids", "Soil Microbiology", "char", "0105 earth and related environmental sciences", "2. Zero hunger", "Carbon Isotopes", "decomposition", "wheat straw", "biomass", "organic carbon", "Fatty Acids", "Western Australia", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "540", "pyrolysis", "forest soil", "carbon sequestration", "Carbon", "[SDV] Life Sciences [q-bio]", "Charcoal", "[SDE]Environmental Sciences", "0401 agriculture", " forestry", " and fisheries", "community structure", "\u00b9\u00b3C-PLFA", "Pyrolysis"]}, "links": [{"href": "https://doi.org/10.1016/j.scitotenv.2013.03.090"}, {"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.2013.03.090", "name": "item", "description": "10.1016/j.scitotenv.2013.03.090", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.scitotenv.2013.03.090"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-11-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2014.09.012", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:17:22Z", "type": "Journal Article", "created": "2014-09-30", "title": "Nitrogen And Phosphorus Constrain Labile And Stable Carbon Turnover In Lowland Tropical Forest Soils", "description": "Tropical forests contain a large stock of soil carbon, but the factors that constrain its mineralization remain poorly understood. Microorganisms, when stimulated by the presence of new inputs of labile organic carbon, can mineralize (\u2018prime\u2019) soil organic matter to acquire nutrients. We used stable carbon isotopes to assess how nutrient demand and soil properties constrain mineralization of added labile (sucrose) carbon and pre-existing (primed) soil carbon in tropical forest soils. In a series of lowland tropical forest soils from Panama, we found that the mineralization of fresh labile carbon was accelerated foremost by phosphorus addition, whereas the mineralization of pre-existing soil carbon was constrained foremost by nitrogen addition. However, there was variation in the relative importance of these nutrients in different soils and the largest effects on the acceleration of sucrose metabolism and constraint of priming occurred following the addition of nitrogen and phosphorus together. The respiration responses due to sucrose or primed soil carbon mineralization were reduced at pH below 4.8 and above 6.0. We conclude that in these tropical forest soils, phosphorus availability is more important in promoting microbial mineralization of sucrose carbon, whereas nitrogen availability is more important in constraining the priming of pre-existing soil organic carbon. This response likely arises because nitrogen is more closely coupled to organic matter cycling, whereas phosphorus is abundant in both organic and inorganic forms. These results suggest that the greatest impact of priming on soil carbon stocks will occur in moderately acidic tropical forest soils of low nitrogen availability. Given long-term changes in both atmospheric carbon dioxide and nitrogen deposition, the impact of priming effects on soil carbon in tropical forest soils may be partially constrained by the abundance of nitrogen.", "keywords": ["2. Zero hunger", "tropical", "carbon dioxide", "stable isotopes", "04 agricultural and veterinary sciences", "15. Life on land", "01 natural sciences", "nitrogen", "carbon isotopes", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "priming effects", "phosphorus", "priming", "microorganisms", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2014.09.012"}, {"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.2014.09.012", "name": "item", "description": "10.1016/j.soilbio.2014.09.012", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2014.09.012"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-01-01T00:00:00Z"}}, {"id": "10.1029/2019jg005511", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:18:04Z", "type": "Journal Article", "created": "2020-01-29", "title": "Particulate Organic Matter Dynamics in a Permafrost Headwater Stream and the Kolyma River Mainstem", "description": "Abstract

Ongoing rapid arctic warming leads to extensive permafrost thaw, which in turn increases the hydrologic connectivity of the landscape by opening up subsurface flow paths. Suspended particulate organic matter (POM) has proven useful to trace permafrost thaw signals in arctic rivers, which may experience higher organic matter loads in the future due to expansion and increasing intensity of thaw processes such as thermokarst and river bank erosion. Here we focus on the Kolyma River watershed in Northeast Siberia, the world's largest watershed entirely underlain by continuous permafrost. To evaluate and characterize the present\uffe2\uff80\uff90day fluvial release of POM from permafrost thaw, we collected water samples every 4\uffe2\uff80\uff937 days during the 4\uffe2\uff80\uff90month open water season in 2013 and 2015 from the lower Kolyma River mainstem and from a small nearby headwater stream (Y3) draining an area completely underlain by Yedoma permafrost (Pleistocene ice\uffe2\uff80\uff90 and organic\uffe2\uff80\uff90rich deposits). Concentrations of particulate organic carbon generally followed the hydrograph with the highest concentrations during the spring flood in late May/early June. For the Kolyma River, concentrations of dissolved organic carbon showed a similar behavior, in contrast to the headwater stream, where dissolved organic carbon values were generally higher and particulate organic carbon concentrations lower than for Kolyma. Carbon isotope analysis (\uffce\uffb413C, \uffce\uff9414C) suggested Kolyma\uffe2\uff80\uff90POM to stem from both contemporary and older permafrost sources, while Y3\uffe2\uff80\uff90POM was more strongly influenced by in\uffe2\uff80\uff90stream production and recent vegetation. Lipid biomarker concentrations (high\uffe2\uff80\uff90molecular\uffe2\uff80\uff90weight n\uffe2\uff80\uff90alkanoic acids and n\uffe2\uff80\uff90alkanes) did not display clear seasonal patterns, yet implied Y3\uffe2\uff80\uff90POM to be more degraded than Kolyma\uffe2\uff80\uff90POM.Soil microorganisms act as gatekeepers for soil\uffe2\uff80\uff93atmosphere carbon exchange by balancing the accumulation and release of soil organic matter. However, poor understanding of the mechanisms responsible hinders the development of effective land management strategies to enhance soil carbon storage. Here we empirically test the link between microbial ecophysiological traits and topsoil carbon content across geographically distributed soils and land use contrasts. We discovered distinct pH controls on microbial mechanisms of carbon accumulation. Land use intensification in low-pH soils that increased the pH above a threshold (~6.2) leads to carbon loss through increased decomposition, following alleviation of acid retardation of microbial growth. However, loss of carbon with intensification in near-neutral pH soils was linked to decreased microbial biomass and reduced growth efficiency that was, in turn, related to trade-offs with stress alleviation and resource acquisition. Thus, less-intensive management practices in near-neutral pH soils have more potential for carbon storage through increased microbial growth efficiency, whereas in acidic soils, microbial growth is a bigger constraint on decomposition rates.A successful mitigation strategy for climate warming agents such as black carbon (BC) requires reliable source information from bottom-up emission inventory data, which can only be verified by observation. We measured BC in one of the fastest-warming and, at the same time, substantially understudied regions on our planet, the northeastern Siberian Arctic. Our observations, compared with an atmospheric transport model, imply that quantification and spatial allocation of emissions at high latitudes, specifically in the Russian Arctic, need improvement by reallocating emissions and significantly shifting source contributions for the transport, domestic, power plant, and gas flaring sectors. This strong shift in reported emissions has potentially considerable implications for climate modeling and BC mitigation efforts.The proliferation of woody plants in grasslands over the past 100+ years can alter carbon, nitrogen, and water cycles and influence land surface\uffe2\uff80\uff93atmosphere interactions. Although the majority of organic carbon in these ecosystems resides belowground, there is no consensus on how this change in land cover has affected soil organic carbon (SOC) and total nitrogen (TN) pools. The degree to which duration of woody plant occupation, climate, and edaphic conditions have mediated SOC and TN responses to changes in life\uffe2\uff80\uff90form composition are poorly understood. We addressed these issues at a desert grassland site in Arizona, USA, where the leguminous shrub velvet mesquite (Prosopis velutina) has proliferated along an elevation/precipitation/temperature gradient and on contrasting soil morphologic surfaces.

On sandy loam complexes of mid\uffe2\uff80\uff90Holocene origin, mean SOC and TN of soils in the grassland matrix increased \uffe2\uff88\uffbc68% and \uffe2\uff88\uffbc45%, respectively, with increasing elevation. Soil organic carbon pools were comparable and TN pools were \uffe2\uff88\uffbc23% higher in Pleistocene\uffe2\uff80\uff90aged clay loam complexes co\uffe2\uff80\uff90occurring with Holocene\uffe2\uff80\uff90aged soils at the upper elevation/climatic zone. Across the site, belowground resources associated with largeProsopisplants were 21\uffe2\uff80\uff93154% (SOC) and 18\uffe2\uff80\uff93127% (TN) higher than those in the grassy matrix.

The variance in SOC and TN pools accounted for byProsopisstem size (a rough surrogate for time of site occupation) was highest at the low\uffe2\uff80\uff90 and mid\uffe2\uff80\uff90elevation sites (69\uffe2\uff80\uff9374%) and lowest at the upper elevation site (32\uffe2\uff80\uff9338%). Soil \uffce\uffb415N values ranged from 5.5\uffe2\uff80\uffb0 to 6.7\uffe2\uff80\uffb0 across the soil/elevation zones but were comparable in herbaceous and shrub\uffe2\uff80\uff90impacted soils and exhibited a weak relationship withProsopisbasal stem diameter (r2< 0.1) and TN (r2< 0.08). The SOC \uffce\uffb413C values decreased linearly with increasingProsopisbasal diameter, suggesting that size and isotopic composition of the SOC pool is a function of time ofProsopissite occupation. Isotopic mixture models indicate that encroachment of C3woody plants has also promoted SOC additions from C4plant sources, indicative of long\uffe2\uff80\uff90term herbaceous facilitation. Grassy sites in contrasting soil/elevation combinations, initially highly distinctive in their SOC pool size and \uffce\uffb413C, appear to be converging on similar values following \uffe2\uff88\uffbc100 years of woody plant proliferation.

", "keywords": ["2. Zero hunger", "Carbon Isotopes", "Nitrogen", "Climate", "Rain", "Temperature", "04 agricultural and veterinary sciences", "15. Life on land", "Poaceae", "01 natural sciences", "Carbon", "Soil", "Prosopis", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Desert Climate", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1890/06-1580.1"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecological%20Applications", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1890/06-1580.1", "name": "item", "description": "10.1890/06-1580.1", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1890/06-1580.1"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2007-10-01T00:00:00Z"}}, {"id": "10.1080/10256010108033279", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:18:49Z", "type": "Journal Article", "created": "2007-07-07", "title": "The Effect Of Soil Temperature And Moisture On Organic Matter Decomposition And Plant Growth", "description": "The effect of soil temperature and moisture on plant growth and mineralisation of organic residues was investigated using 15N-labelled soybean residues and temperature-controlled tanks in the glasshouse. Treatments were arranged in a factorial design with: three soil temperatures (20, 26 and 30 degrees C), two soil moisture regimes (8% (-800 Kpa) or 12% (-100 Kpa)), soybean residues added (enriched at 1.82 atom % 15N excess) or no residues; and either sown with ryegrass or not sown. Pots were sampled six weeks after planting and 15N-enrichment and delta13C of the plant and soil fractions were determined. Soil inorganic N was also periodically measured. Available inorganic N increased significantly with addition of residues and generally decreased with increasing temperature. Plant dry matter decreased significantly with increase in soil temperature and increased with increasing moisture. Root-to-shoot ratio declined with increased temperature and moisture. Percentage nitrogen derived from residues (%Ndfr) increased linearly with increased temperature and moisture. Delta13C decreased linearly with increasing temperature and decreasing moisture status. There was a significant correlation between transpiration and dry matter production, but there was no correlation between water use efficiency and delta13C. The results suggest that C: N ratio of the root material effects the root turnover and in turn the water supply capacity of the root system.", "keywords": ["2. Zero hunger", "Carbon Isotopes", "Nitrogen Isotopes", "Glycine max", "Secale", "Temperature", "Water", "04 agricultural and veterinary sciences", "Plant Roots", "6. Clean water", "Soil", "Austria", "0401 agriculture", " forestry", " and fisheries", "Ecosystem"], "contacts": [{"organization": "R C Hood", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1080/10256010108033279"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Isotopes%20in%20Environmental%20and%20Health%20Studies", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1080/10256010108033279", "name": "item", "description": "10.1080/10256010108033279", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1080/10256010108033279"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2001-04-01T00:00:00Z"}}, {"id": "10.1093/jxb/err133", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:18:59Z", "type": "Journal Article", "created": "2011-05-18", "title": "Interactive Effects Of Elevated Co2, Warming, And Drought On Photosynthesis Of Deschampsia Flexuosa In A Temperate Heath Ecosystem", "description": "Global change factors affect plant carbon uptake in concert. In order to investigate the response directions and potential interactive effects, and to understand the underlying mechanisms, multifactor experiments are needed. The focus of this study was on the photosynthetic response to elevated CO(2) [CO2; free air CO(2) enrichment (FACE)], drought (D; water-excluding curtains), and night-time warming (T; infrared-reflective curtains) in a temperate heath. A/C(i) curves were measured, allowing analysis of light-saturated net photosynthesis (P(n)), light- and CO(2)-saturated net photosynthesis (P(max)), stomatal conductance (g(s)), the maximal rate of Rubisco carboxylation (V(cmax)), and the maximal rate of ribulose bisphosphate (RuBP) regeneration (J(max)) along with leaf \u03b4(13)C, and carbon and nitrogen concentration on a monthly basis in the grass Deschampsia flexuosa. Seasonal drought reduced P(n) via g(s), but severe (experimental) drought decreased P(n) via a reduction in photosynthetic capacity (P(max), J(max), and V(cmax)). The effects were completely reversed by rewetting and stimulated P(n) via photosynthetic capacity stimulation. Warming increased early and late season P(n) via higher P(max) and J(max). Elevated CO(2) did not decrease g(s), but stimulated P(n) via increased C(i). The T\u00d7CO2 synergistically increased plant carbon uptake via photosynthetic capacity up-regulation in early season and by better access to water after rewetting. The effects of the combination of drought and elevated CO(2) depended on soil water availability, with additive effects when the soil water content was low and D\u00d7CO2 synergistic stimulation of P(n) after rewetting. The photosynthetic responses appeared to be highly influenced by growth pattern. The grass has opportunistic water consumption, and a biphasic growth pattern allowing for leaf dieback at low soil water availability followed by rapid re-growth of active leaves when rewetted and possibly a large resource allocation capability mediated by the rhizome. This growth characteristic allowed for the photosynthetic capacity up-regulations that mediated the T\u00d7CO2 and D\u00d7CO2 synergistic effects on photosynthesis. These are clearly advantageous characteristics when exposed to climate changes. In conclusion, after 1 year of experimentation, the limitations by low soil water availability and stimulation in early and late season by warming clearly structure and interact with the photosynthetic response to elevated CO(2) in this grassland species.", "keywords": ["0301 basic medicine", "2. Zero hunger", "Carbon Isotopes", "0303 health sciences", "Light", "Nitrogen", "Rain", "Temperature", "Water", "Carbon Dioxide", "15. Life on land", "Poaceae", "Research Papers", "Carbon", "6. Clean water", "Droughts", "Soil", "03 medical and health sciences", "13. Climate action", "Plant Stomata", "Regression Analysis", "Seasons", "Photosynthesis", "Ecosystem"]}, "links": [{"href": "https://doi.org/10.1093/jxb/err133"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20Experimental%20Botany", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/jxb/err133", "name": "item", "description": "10.1093/jxb/err133", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/jxb/err133"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-05-16T00:00:00Z"}}, {"id": "10.1093/treephys/21.2-3.163", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:00Z", "type": "Journal Article", "created": "2012-01-20", "title": "Interactive Effects Of Elevated Co2 Concentration And Nitrogen Supply On Partitioning Of Newly Fixed 13c And 15n Between Shoot And Roots Of Pedunculate Oak Seedlings (Quercus Robur)", "description": "Pedunculate oak (Quercus robur L.) seedlings were grown for 3 or 4 months (second- and third-flush stages) in greenhouses at two atmospheric CO2 concentrations ([CO2]) (350 or 700 micromol mol(-1)) and two nitrogen fertilization regimes (6.1 or 0.61 mmol N l(-1) nutrient solution). Combined effects of [CO2] and nitrogen fertilization on partitioning of newly acquired carbon (C) and nitrogen (N) were assessed by dual 13C and 15N short-term labeling of seedlings at the second- or third-flush stage of development. In the low-N treatment, root growth, but not shoot growth, was stimulated by elevated [CO2], with the result that shoot/root biomass ratio declined. At the second-flush stage, overall seedling biomass growth was increased (13%) by elevated [CO2] regardless of N fertilization. At the third-flush stage, elevated [CO2] increased growth sharply (139%) in the high-N but not the low-N treatment. Root/shoot biomass ratios were threefold higher in the low-N treatment relative to the high-N treatment. At the second-flush stage, leaf area was 45-51% greater in the high-N treatment than in the low-N treatment. At the-third flush stage, there was a positive interaction between the effects of N fertilization and [CO2] on leaf area, which was 93% greater in the high-N/elevated [CO2] treatment than in the low-N/ambient [CO2] treatment. Specific leaf area was reduced (17-25%) by elevated [CO2], whereas C and N concentrations of seedlings increased significantly in response to either elevated [CO2] or high-N fertilization. At the third-flush stage, acquisition of C and N per unit dry mass of leaf and fine root was 51 and 77% greater, respectively, in the elevated [CO2]/high-N fertilization treatment than in the ambient [CO2]/low-N fertilization treatment. However, there was dilution of leaf N in response to elevated [CO2]. Partitioning of newly acquired C and N between shoot and roots was altered by N fertilization but not [CO2]. More newly acquired C and N were partitioned to roots in the low-N treatment than in the high-N treatment.", "keywords": ["0106 biological sciences", "Carbon Isotopes", "[SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture", "Nitrogen Isotopes", "Nitrogen", "forestry", "Carbon Dioxide", "15. Life on land", "Plant Roots", "01 natural sciences", "Trees", "CHENE PEDONCULE", "Quercus", "Soil", "Biomass", "[SDV.SA.SF] Life Sciences [q-bio]/Agricultural sciences/Silviculture", " forestry", "Plant Shoots"]}, "links": [{"href": "https://doi.org/10.1093/treephys/21.2-3.163"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Tree%20Physiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/treephys/21.2-3.163", "name": "item", "description": "10.1093/treephys/21.2-3.163", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/treephys/21.2-3.163"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2001-02-01T00:00:00Z"}}, {"id": "10.1093/treephys/tpr121", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:01Z", "type": "Journal Article", "created": "2011-12-07", "title": "Leaf-Trait Responses To Irrigation Of The Endemic Fog-Oasis Tree Myrcianthes Ferreyrae: Can A Fog Specialist Benefit From Regular Watering?", "description": "Myrcianthes ferreyrae is an endemic, endangered species, with a small number of individuals located only in hyperarid, fog-oases known as lomas along the Peruvian desert in southern Peru, where fog is the main source of water. Following centuries of severe deforestation, reforestation with this native species was conducted in the Atiquipa lomas, Arequipa-Per\u00fa. On five slopes, five 2-year-old seedlings were irrigated monthly with water trapped by raschel-mesh fog collectors, supplementing natural rainfall with 0, 20, 40, 60 and 80 mm month(-1) from February to August 2008. We measured plant growth, increment in basal diameter, height and five leaf traits: leaf mass area (LMA), leaf carbon isotope composition (\u03b4(13)C), nitrogen per leaf area, total leaf carbon and stomatal density; which are indicative of the physiological changes resulting from increased water supply. Plant growth rates, estimated from the variation of either shoot basal diameter or maximum height, were highly correlated with total biomass. Only LMA and \u03b4(13)C were higher in irrigated than in control plants, but we found no further differences among irrigation treatments. This threshold response suggests an on-off strategy fitted to exploit pulses of fog water, which are always limited in magnitude in comparison with natural rain. The absence of a differential response to increased water supply is in agreement with the low phenotypic plasticity expected in plants from very stressful environments. Our results have practical implications for reforestation projects, since irrigating with 20 mm per month is sufficient to achieve the full growth capacity of this species.", "keywords": ["0106 biological sciences", "Carbon Isotopes", "Principal Component Analysis", "Agricultural Irrigation", "Geography", "Water", "15. Life on land", "01 natural sciences", "Statistics", " Nonparametric", "6. Clean water", "Trees", "Plant Leaves", "Quantitative Trait", " Heritable", "Multivariate Analysis", "Peru", "Plant Stomata", "Biomass", "Weather"]}, "links": [{"href": "https://doi.org/10.1093/treephys/tpr121"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Tree%20Physiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/treephys/tpr121", "name": "item", "description": "10.1093/treephys/tpr121", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/treephys/tpr121"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-12-05T00:00:00Z"}}, {"id": "10.1093/treephys/tpt077", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:02Z", "type": "Journal Article", "created": "2013-10-22", "title": "Photosynthesis of Quercus suber is affected by atmospheric NH3 generated by multifunctional agrosystems", "description": "Montados are evergreen oak woodlands dominated by Quercus species, which are considered to be key to biodiversity conservation and ecosystem services. This ecosystem is often used for cattle breeding in most regions of the Iberian Peninsula, which causes plants to receive extra nitrogen as ammonia (NH(3)) through the atmosphere. The effect of this atmospheric NH(3) (NH(3atm)) on ecosystems is still under discussion. This study aimed to evaluate the effects of an NH(3atm) concentration gradient downwind of a cattle barn in a Montado area. Leaves from the selected Quercus suber L. trees along the gradient showed a clear influence of the NH(3) on \u03b4(13)C, as a consequence of a strong limitation on the photosynthetic machinery by a reduction of both stomatal and mesophyll conductance. A detailed study of the impact of NH(3atm) on the photosynthetic performance of Q. suber trees is presented, and new mechanisms by which NH(3) affects photosynthesis at the leaf level are suggested.", "keywords": ["0106 biological sciences", "0301 basic medicine", "Carbon Isotopes", "Agriculture", "Plant Transpiration", "15. Life on land", "01 natural sciences", "Trees", "Plant Leaves", "Quercus", "03 medical and health sciences", "Ammonia", "Plant Stomata", "Photosynthesis", "Mesophyll Cells", "Ecosystem"]}, "links": [{"href": "http://academic.oup.com/treephys/article-pdf/33/12/1328/4675950/tpt077.pdf"}, {"href": "https://doi.org/10.1093/treephys/tpt077"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Tree%20Physiology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1093/treephys/tpt077", "name": "item", "description": "10.1093/treephys/tpt077", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1093/treephys/tpt077"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-10-21T00:00:00Z"}}, {"id": "10.1111/gcb.12666", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:20Z", "type": "Journal Article", "created": "2014-06-21", "title": "Interactive Effects Of Elevated Co2 And Nitrogen Deposition On Fatty Acid Molecular And Isotope Composition Of Above- And Belowground Tree Biomass And Forest Soil Fractions", "description": "Abstract

Atmospheric carbon dioxide (CO2) and reactive nitrogen (N) concentrations have been increasing due to human activities and impact the global carbon (C) cycle by affecting plant photosynthesis and decomposition processes in soil. Large amounts of C are stored in plants and soils, but the mechanisms behind the stabilization of plant\uffe2\uff80\uff90 and microbial\uffe2\uff80\uff90derived organic matter (OM) in soils are still under debate and it is not clear how N deposition affects soil OM dynamics. Here, we studied the effects of 4\uffc2\uffa0years of elevated (13C\uffe2\uff80\uff90depleted) CO2 and N deposition in forest ecosystems established in open\uffe2\uff80\uff90top chambers on composition and turnover of fatty acids (FAs) in plants and soils. FAs served as biomarkers for plant\uffe2\uff80\uff90 and microbial\uffe2\uff80\uff90derived OM in soil density fractions. We analyzed above\uffe2\uff80\uff90 and belowground plant biomass of beech and spruce trees as well as soil density fractions for the total organic C and FA molecular and isotope (\uffce\uffb413C) composition. FAs did not accumulate relative to total organic C in fine mineral fractions, showing that FAs are not effectively stabilized by association with soil minerals. The \uffce\uffb413C values of FAs in plant biomass increased under high N deposition. However, the N effect was only apparent under elevated CO2 suggesting a N limitation of the system. In soil fractions, only isotope compositions of short\uffe2\uff80\uff90chain FAs (C16+18) were affected. Fractions of \uffe2\uff80\uff98new\uffe2\uff80\uff99 (experimental\uffe2\uff80\uff90derived) FAs were calculated using isotope depletion in elevated CO2 plots and decreased from free light to fine mineral fractions. \uffe2\uff80\uff98New\uffe2\uff80\uff99 FAs were higher in short\uffe2\uff80\uff90chain compared to long\uffe2\uff80\uff90chain FAs (C20\uffe2\uff88\uff9230), indicating a faster turnover of short\uffe2\uff80\uff90chain compared to long\uffe2\uff80\uff90chain FAs. Increased N deposition did not significantly affect the quantity of \uffe2\uff80\uff98new\uffe2\uff80\uff99 FAs in soil fractions, but showed a tendency of increased amounts of \uffe2\uff80\uff98old\uffe2\uff80\uff99 (pre\uffe2\uff80\uff90experimental) C suggesting that decomposition of \uffe2\uff80\uff98old\uffe2\uff80\uff99 C is retarded by high N inputs.

", "keywords": ["UFSP13-8 Global Change and Biodiversity", "2306 Global and Planetary Change", "Chemical Fractionation", "Forests", "2300 General Environmental Science", "Soil", "Fagus", "Environmental Chemistry", "Biomass", "Photosynthesis", "Picea", "General Environmental Science", "2. Zero hunger", "Global and Planetary Change", "Analysis of Variance", "Carbon Isotopes", "Ecology", "Atmosphere", "Fatty Acids", "04 agricultural and veterinary sciences", "Carbon Dioxide", "15. Life on land", "Reactive Nitrogen Species", "13. Climate action", "2304 Environmental Chemistry", "570 Life sciences; biology", "0401 agriculture", " forestry", " and fisheries", "2303 Ecology"]}, "links": [{"href": "https://doi.org/10.1111/gcb.12666"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Global%20Change%20Biology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/gcb.12666", "name": "item", "description": "10.1111/gcb.12666", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/gcb.12666"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2014-07-08T00:00:00Z"}}, {"id": "10.1111/j.1469-8137.2010.03613.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:40Z", "type": "Journal Article", "created": "2011-01-19", "title": "Drought Alters Carbon Fluxes In Alpine Snowbed Ecosystems Through Contrasting Impacts On Graminoids And Forbs", "description": "\u2022 Climate change is predicted to increase the frequency of drought events in alpine ecosystems with the potential to affect carbon turnover. \u2022 We removed intact turfs from a Nardus stricta alpine snowbed community and subjected half of them to two drought events of 8 d duration under controlled conditions. Leachate dissolved organic carbon (DOC) was measured throughout the 6 wk study period, and a (13)CO(2) pulse enabled quantification of fluxes of recent assimilate into shoots, roots and leachate and ecosystem CO(2) exchange. \u2022 The amount of DOC in leachate from droughted cores was 62% less than in controls. Drought reduced graminoid biomass, increased forb biomass, had no effect on bryophytes, and led to an overall decrease in total above-ground biomass compared with controls. Net CO(2) exchange, gross photosynthesis and the amount of (13)CO(2) fixed were all significantly less in droughted turfs. These turfs also retained proportionally more (13)C in shoots, allocated less (13)C to roots, and the amount of dissolved organic (13)C recovered in leachate was 57% less than in controls. \u2022 Our data show that drought events can have significant impacts on ecosystem carbon fluxes, and that the principal mechanism behind this is probably changes in the relative abundance of forbs and grasses.", "keywords": ["0106 biological sciences", "leachate", "Carbon Isotopes", "Nardus stricta", "04 agricultural and veterinary sciences", "Plants", "15. Life on land", "net CO2 exchange", "dissolved organic carbon", "01 natural sciences", "plant diversity", "Carbon", "6. Clean water", "Droughts", "climate change", "13. Climate action", "Snow", "13CO(2)", "0401 agriculture", " forestry", " and fisheries", "Biomass", "Organic Chemicals", "Ecosystem"]}, "links": [{"href": "https://doi.org/10.1111/j.1469-8137.2010.03613.x"}, {"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/j.1469-8137.2010.03613.x", "name": "item", "description": "10.1111/j.1469-8137.2010.03613.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1469-8137.2010.03613.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2011-01-19T00:00:00Z"}}, {"id": "10.1111/nph.12569", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:47Z", "type": "Journal Article", "created": "2013-10-31", "title": "Experimental Drought Reduces The Transfer Of Recently Fixed Plant Carbon To Soil Microbes And Alters The Bacterial Community Composition In A Mountain Meadow", "description": "Summary

Drought affects plants and soil microorganisms, but it is still not clear how it alters the carbon (C) transfer at the plant\uffe2\uff80\uff93microbial interface. Here, we tested direct and indirect effects of drought on soil microbes and microbial turnover of recent plant\uffe2\uff80\uff90derived C in a mountain meadow.

Microbial community composition was assessed using phospholipid fatty acids (PLFAs); the allocation of recent plant\uffe2\uff80\uff90derived C to microbial groups was analysed by pulse\uffe2\uff80\uff90labelling of canopy sections with 13CO2 and the subsequent tracing of the label into microbial PLFAs.

Microbial biomass was significantly higher in plots exposed to a severe experimental drought. In addition, drought induced a shift of the microbial community composition, mainly driven by an increase of Gram\uffe2\uff80\uff90positive bacteria. Drought reduced belowground C allocation, but not the transfer of recently plant\uffe2\uff80\uff90assimilated C to fungi, and in particular reduced tracer uptake by bacteria. This was accompanied by an increase of 13C in the extractable organic C pool during drought, which was even more pronounced after plots were mown.

We conclude that drought weakened the link between plant and bacterial, but not fungal, C turnover, and facilitated the growth of potentially slow\uffe2\uff80\uff90growing, drought\uffe2\uff80\uff90adapted soil microbes, such as Gram\uffe2\uff80\uff90positive bacteria.

", "keywords": ["Time Factors", "Nitrogen", "Mowing", "Mountain grassland", "Carbon Cycle", "Microbial community composition", "Soil", "Biomass", "Ecosystem", "Soil Microbiology", "2. Zero hunger", "106022 Mikrobiologie", "Carbon Isotopes", "Drought", "Research", "Microbiota", "Water", "Carbon allocation", "Microclimate", "04 agricultural and veterinary sciences", "15. Life on land", "Carbon", "6. Clean water", "Droughts", "C pulse-labelling", "13. Climate action", "Austria", "Phospholipid fatty acids", "106022 Microbiology", "0401 agriculture", " forestry", " and fisheries"]}, "links": [{"href": "https://doi.org/10.1111/nph.12569"}, {"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.12569", "name": "item", "description": "10.1111/nph.12569", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/nph.12569"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-10-31T00:00:00Z"}}, {"id": "10.1111/pce.14124", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:49Z", "type": "Journal Article", "created": "2021-06-07", "title": "The size and the age of the metabolically active carbon in tree roots", "description": "Abstract

Little is known about the sources and age of C respired by tree roots. Previous research in stems identified two functional pools of non\uffe2\uff80\uff90structural carbohydrates (NSC): an \uffe2\uff80\uff9cactive\uffe2\uff80\uff9d pool supplied directly from canopy photo\uffe2\uff80\uff90assimilates supporting metabolism and a \uffe2\uff80\uff9cstored\uffe2\uff80\uff9d pool used when fresh C supplies are limited. We compared the C isotope composition of water\uffe2\uff80\uff90soluble NSC and respired CO2for aspen roots (Populus tremulahybrids) cut off from fresh C supply after stem\uffe2\uff80\uff90girdling or prolonged incubation of excised roots. We used bomb radiocarbon to estimate the time elapsed since C fixation for respired CO2, water\uffe2\uff80\uff90soluble NSC and structural \uffce\uffb1\uffe2\uff80\uff90cellulose. While freshly excised roots (mostly <2.9\uffe2\uff80\uff89mm in diameter) respired CO2fixed <1\uffc2\uffa0year previously, the age increased to 1.6\uffe2\uff80\uff932.9\uffc2\uffa0year within a week after root excision. Freshly excised roots from trees girdled ~3\uffc2\uffa0months ago had respiration rates and NSC stocks similar to un\uffe2\uff80\uff90girdled trees but respired older C (~1.2\uffc2\uffa0year). We estimate that over 3\uffc2\uffa0months NSC in girdled roots must be replaced 5\uffe2\uff80\uff937 times by reserves remobilized from root\uffe2\uff80\uff90external sources. Using a mixing model and observed correlations between \uffce\uff9414C of water\uffe2\uff80\uff90soluble C and \uffce\uffb1\uffe2\uff80\uff90cellulose, we estimate ~30% of C is \uffe2\uff80\uff9cactive\uffe2\uff80\uff9d (~5\uffc2\uffa0mg C g\uffe2\uff88\uff921).Stable isotope labeling of agricultural polyesters enables demonstration of their microbial utilization in soils.

", "keywords": ["0301 basic medicine", "Polymers", "Polyesters", "Spectrometry", " Mass", " Secondary Ion", "ENZYMATIC-HYDROLYSIS", "CATERPILLARS", "ECOLOGY", "7. Clean energy", "03 medical and health sciences", "Biomass", "SDG 2 \u2013 Kein Hunger", "SDG 2 - Zero Hunger", "POLYESTERS", "Research Articles", "Soil Microbiology", "2. Zero hunger", "106022 Mikrobiologie", "Carbon Isotopes", "0303 health sciences", "Fungi", "Agriculture", "Lipase", "Carbon Dioxide", "Carbon", "COPOLYESTERS", "Biodegradation", " Environmental", "13. Climate action", "106022 Microbiology", "POLYETHYLENE BIO-DEGRADATION"]}, "links": [{"href": "https://doi.org/10.1126/sciadv.aas9024"}, {"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.aas9024", "name": "item", "description": "10.1126/sciadv.aas9024", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1126/sciadv.aas9024"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-07-06T00:00:00Z"}}, {"id": "10.1126/science.1113977", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:19:53Z", "type": "Journal Article", "created": "2005-08-25", "title": "Carbon Flux And Growth In Mature Deciduous Forest Trees Exposed To Elevated Co2", "description": "

Whether rising atmospheric carbon dioxide (CO 2 ) concentrations will cause forests to grow faster and store more carbon is an open question. Using free air CO 2 release in combination with a canopy crane, we found an immediate and sustained enhancement of carbon flux through 35-meter-tall temperate forest trees when exposed to elevated CO 2 . However, there was no overall stimulation in stem growth and leaf litter production after 4 years. Photosynthetic capacity was not reduced, leaf chemistry changes were minor, and tree species differed in their responses. Although growing vigorously, these trees did not accrete more biomass carbon in stems in response to elevated CO 2 , thus challenging projections of growth responses derived from tests with smaller trees.

", "keywords": ["Carbon Isotopes", "Plant Stems", "Atmosphere", "Nitrogen", "0211 other engineering and technologies", "0207 environmental engineering", "02 engineering and technology", "Carbon Dioxide", "15. Life on land", "Lignin", "Carbon", "Trees", "Plant Leaves", "Quercus", "Soil", "Betulaceae", "13. Climate action", "Fagus", "Biomass", "Photosynthesis", "Ecosystem", "Plant Shoots", "Switzerland"]}, "links": [{"href": "https://doi.org/10.1126/science.1113977"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Science", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1126/science.1113977", "name": "item", "description": "10.1126/science.1113977", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1126/science.1113977"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-08-26T00:00:00Z"}}, {"id": "10.15454/KMNR6R", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:20:25Z", "type": "Dataset", "title": "Depth distribution of soil carbon age inferred from natural 13C labelling meta-analysis", "description": "Depth profiles soil organic carbon turnover estimated by the natural 13C labelling technique. Data have been collected from published articles plus original data (meta-analysis). Dataset contains raw primary data, calculated data and ancillary information analysed and generated during the study: 'Atmosphere-soil carbon transfer as a function of soil depth'", "keywords": ["carbon 13", "Earth and Environmental Science", "Climate", "Agriculture", " Forestry", " Horticulture", " Aquaculture", "stable carbon isotopes", "Biodiversity and Ecology", "carbon cycle", "Silviculture", "Agriculture", " Forestry", " Horticulture", "Soils and soil sciences", "Ecology", "Agricultural Sciences", "Life Sciences", "15. Life on land", "Biospheric Sciences", "meta-analysis", "soil organic carbon", "13. Climate action", "Earth and Environmental Sciences", "Soil Sciences", "Forests and Forest Products", "Agriculture", " Forestry", " Horticulture", " Aquaculture and Veterinary Medicine", "Environmental Research", "Natural Sciences", "Geosciences", "meta analysis"], "contacts": [{"organization": "Balesdent, Jerome, Basile-Doelsch, Isabelle, Chadoeuf, Jo\u00ebl, Cornu, Sophie, Derrien, Delphine, Fekiacova, Zuzana, Hatt\u00e9, Christine,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.15454/KMNR6R"}, {"rel": "self", "type": "application/geo+json", "title": "10.15454/KMNR6R", "name": "item", "description": "10.15454/KMNR6R", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.15454/KMNR6R"}, {"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": "10.1890/14-2228.1", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:20:47Z", "type": "Journal Article", "created": "2015-04-15", "title": "Fresh carbon input differentially impacts soil carbon decomposition across natural and managed systems", "description": "

The amount of fresh carbon input into soil is experiencing substantial changes under global change. It is unclear what will be the consequences of such input changes on native soil carbon decomposition across ecosystems. By synthesizing data from 143 experimental comparisons, we show that, on average, fresh carbon input stimulates soil carbon decomposition by 14%. The response was lower in forest soils (1%) compared with soils from other ecosystems (>24%), and higher following inputs of plant residue\uffe2\uff80\uff90like substrates (31%) compared to root exudate\uffe2\uff80\uff90like substrates (9%). The responses decrease with the baseline soil carbon decomposition rate under no additional carbon input, but increase with the fresh carbon input rate. The rates of these changes vary significantly across ecosystems and with the carbon substrates being added. These findings can be applied to provide robust estimates of soil carbon balance across ecosystems under changing aboveground and belowground inputs as consequence of climate and land management changes.

", "keywords": ["Carbon Isotopes", "Soil", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "Carbon", "Environmental Monitoring"], "contacts": [{"organization": "Caleb Smith, Zhongkui Luo, Enli Wang,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1890/14-2228.1"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1890/14-2228.1", "name": "item", "description": "10.1890/14-2228.1", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1890/14-2228.1"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-10-01T00:00:00Z"}}, {"id": "20.500.14243/331510", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:26:52Z", "type": "Journal Article", "created": "2017-08-09", "title": "Distinguishing between old and modern permafrost sources in the northeast Siberian land\u2013shelf system with compound-specific \u03b42H analysis", "description": "

Abstract. Pleistocene ice complex permafrost deposits contain roughly a quarter of the organic carbon (OC) stored in permafrost (PF) terrain. When permafrost thaws, its OC is remobilized into the (aquatic) environment where it is available for degradation, transport or burial. Aquatic or coastal environments contain sedimentary reservoirs that can serve as archives of past climatic change. As permafrost thaw is increasing throughout the Arctic, these reservoirs are important locations to assess the fate of remobilized permafrost OC.We here present compound-specific deuterium (\u03b42H) analysis on leaf waxes as a tool to distinguish between OC released from thawing Pleistocene permafrost (ice complex deposits; ICD) and from thawing Holocene permafrost (from near-surface soils). Bulk geochemistry (%OC; \u03b413C; %total nitrogen, TN) was analyzed as well as the concentrations and \u03b42H signatures of long-chain n-alkanes (C21 to C33) and mid- to long-chain n-alkanoic acids (C16 to C30) extracted from both ICD-PF samples (n\u2009=\u2009\u202f9) and modern vegetation and O-horizon (topsoil-PF) samples (n\u2009=\u2009\u202f9) from across the northeast Siberian Arctic. Results show that these topsoil-PF samples have higher %OC, higher OC\u202f\u2215\u202fTN values and more depleted \u03b413C-OC values than ICD-PF samples, suggesting that these former samples trace a fresher soil and/or vegetation source. Whereas the two investigated sources differ on the bulk geochemical level, they are, however, virtually indistinguishable when using leaf wax concentrations and ratios. However, on the molecular isotope level, leaf wax biomarker \u03b42H values are statistically different between topsoil PF and ICD PF. For example, the mean \u03b42H value of C29\u00a0n-alkane was \u2212246\u202f\u00b1\u202f13\u202f\u2030 (mean\u202f\u00b1\u202fSD) for topsoil PF and \u2212280\u202f\u00b1\u202f12\u202f\u2030 for ICD PF. With a dynamic isotopic range (difference between two sources) of 34 to 50\u202f\u2030; the isotopic fingerprints of individual, abundant, biomarker molecules from leaf waxes can thus serve as endmembers to distinguish between these two sources. We tested this molecular \u03b42H tracer along with another source-distinguishing approach, dual-carbon (\u03b413C\u2013\u039414C) isotope composition of bulk OC, for a surface sediment transect in the Laptev Sea. Results show that general offshore patterns along the shelf-slope transect are similar, but the source apportionment between the approaches vary, which may highlight the advantages of either. This study indicates that the application of \u03b42H leaf wax values has potential to serve as a complementary quantitative measure of the source and differential fate of OC thawed out from different permafrost compartments.

", "keywords": ["Environmental sciences", "QE1-996.5", "13. Climate action", "SEDIMENTARY ORGANIC-MATTER; N-ALKANE DISTRIBUTIONS; DMITRY LAPTEV STRAIT; LENA RIVER DELTA; BUOR-KHAYA BAY; ARCTIC SHELF; STABLE-ISOTOPES; CARBON ISOTOPES; YEDOMA REGION; GROUND-ICE", "GE1-350", "Geology", "SDG 14 - Life Below Water", "15. Life on land", "01 natural sciences", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/20.500.14243/331510"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/The%20Cryosphere", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "20.500.14243/331510", "name": "item", "description": "20.500.14243/331510", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.14243/331510"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-08-09T00:00:00Z"}}, {"id": "10.5061/dryad.29mb7", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:22:27Z", "type": "Dataset", "title": "Data from: Growth and carbon relations of mature Picea abies trees under 5\u00a0years of free-air CO2 enrichment", "description": "unspecifiedPicea-FACE_synthesis_gas_exchangeNeedle gas exchange rates measured on 1-year-old needles in ambient (A) and elevated (E) trees at both ambient and elevated CO2 levels (400 and 550 ppm) during five summer field campaigns (18 June, 2 July, and 19 September 2013; 23 and 26 September 2014).", "keywords": ["Conifers", "elevated CO2", "height profile", "carbon isotopes", "Picea abies", "Face", "wood anatomy", "15. Life on land"]}, "links": [{"href": "https://doi.org/10.5061/dryad.29mb7"}, {"rel": "self", "type": "application/geo+json", "title": "10.5061/dryad.29mb7", "name": "item", "description": "10.5061/dryad.29mb7", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.5061/dryad.29mb7"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-06-27T00:00:00Z"}}, {"id": "20.500.11850/280881", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:26:46Z", "type": "Journal Article", "created": "2018-07-25", "title": "Biodegradation of synthetic polymers in soils: Tracking carbon into CO 2 and microbial biomass", "description": "

Stable isotope labeling of agricultural polyesters enables demonstration of their microbial utilization in soils.

", "keywords": ["0301 basic medicine", "Polymers", "Polyesters", "Spectrometry", " Mass", " Secondary Ion", "ENZYMATIC-HYDROLYSIS", "CATERPILLARS", "ECOLOGY", "7. Clean energy", "03 medical and health sciences", "Biomass", "SDG 2 \u2013 Kein Hunger", "SDG 2 - Zero Hunger", "POLYESTERS", "Research Articles", "Soil Microbiology", "2. Zero hunger", "106022 Mikrobiologie", "Carbon Isotopes", "0303 health sciences", "Fungi", "Agriculture", "Lipase", "Carbon Dioxide", "Carbon", "COPOLYESTERS", "Biodegradation", " Environmental", "13. Climate action", "106022 Microbiology", "POLYETHYLENE BIO-DEGRADATION"]}, "links": [{"href": "https://doi.org/20.500.11850/280881"}, {"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": "20.500.11850/280881", "name": "item", "description": "20.500.11850/280881", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/20.500.11850/280881"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-07-06T00:00:00Z"}}, {"id": "11250/2499096", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:26:16Z", "type": "Journal Article", "created": "2017-01-31", "title": "Siberian Arctic black carbon sources constrained by model and observation", "description": "Significance

A successful mitigation strategy for climate warming agents such as black carbon (BC) requires reliable source information from bottom-up emission inventory data, which can only be verified by observation. We measured BC in one of the fastest-warming and, at the same time, substantially understudied regions on our planet, the northeastern Siberian Arctic. Our observations, compared with an atmospheric transport model, imply that quantification and spatial allocation of emissions at high latitudes, specifically in the Russian Arctic, need improvement by reallocating emissions and significantly shifting source contributions for the transport, domestic, power plant, and gas flaring sectors. This strong shift in reported emissions has potentially considerable implications for climate modeling and BC mitigation efforts.Ongoing rapid arctic warming leads to extensive permafrost thaw, which in turn increases the hydrologic connectivity of the landscape by opening up subsurface flow paths. Suspended particulate organic matter (POM) has proven useful to trace permafrost thaw signals in arctic rivers, which may experience higher organic matter loads in the future due to expansion and increasing intensity of thaw processes such as thermokarst and river bank erosion. Here we focus on the Kolyma River watershed in Northeast Siberia, the world's largest watershed entirely underlain by continuous permafrost. To evaluate and characterize the present\uffe2\uff80\uff90day fluvial release of POM from permafrost thaw, we collected water samples every 4\uffe2\uff80\uff937 days during the 4\uffe2\uff80\uff90month open water season in 2013 and 2015 from the lower Kolyma River mainstem and from a small nearby headwater stream (Y3) draining an area completely underlain by Yedoma permafrost (Pleistocene ice\uffe2\uff80\uff90 and organic\uffe2\uff80\uff90rich deposits). Concentrations of particulate organic carbon generally followed the hydrograph with the highest concentrations during the spring flood in late May/early June. For the Kolyma River, concentrations of dissolved organic carbon showed a similar behavior, in contrast to the headwater stream, where dissolved organic carbon values were generally higher and particulate organic carbon concentrations lower than for Kolyma. Carbon isotope analysis (\uffce\uffb413C, \uffce\uff9414C) suggested Kolyma\uffe2\uff80\uff90POM to stem from both contemporary and older permafrost sources, while Y3\uffe2\uff80\uff90POM was more strongly influenced by in\uffe2\uff80\uff90stream production and recent vegetation. Lipid biomarker concentrations (high\uffe2\uff80\uff90molecular\uffe2\uff80\uff90weight n\uffe2\uff80\uff90alkanoic acids and n\uffe2\uff80\uff90alkanes) did not display clear seasonal patterns, yet implied Y3\uffe2\uff80\uff90POM to be more degraded than Kolyma\uffe2\uff80\uff90POM.Major Arctic rivers are undergoing changes due to climate warming with higher discharge and increased amounts of solutes and organic carbon (OC) draining into rivers and coastal seas. Permafrost thaw mobilizes previously frozen OC to the fluvial network where it can be degraded into greenhouse gases and emitted to the atmosphere. Degradation of OC during downstream transport, especially of the particulate OC (POC), is however poorly characterized. Here, we quantified POC degradation in the Kolyma River, the largest river system underlain with continuous permafrost, during 9\uffe2\uff80\uff9315 d whole-water incubations (containing POC and dissolved OC\uffe2\uff80\uff94DOC) during two seasons: spring freshet (early June) and late summer (end of July). Furthermore, we examined interactions between dissolved and particulate phases using parallel incubations of filtered water (only DOC). We measured OC concentrations and carbon isotopes (\uffce\uffb413C, \uffce\uff9414C) to define carbon losses and to characterize OC composition, respectively. We found that both POC composition and biodegradability differs greatly between seasons. During summer, POC was predominantly autochthonous (47%\uffe2\uff80\uff9395%) and degraded rapidly (\uffe2\uff88\uffbc33% loss) whereas freshet POC was largely of allochthonous origin (77%\uffe2\uff80\uff9396%) and less degradable. Gains in POC concentrations (up to 31%) were observed in freshet waters that could be attributed to flocculation and adsorption of DOC to particles. The demonstrated DOC flocculation and adsorption to POC indicates that the fate and dynamics of the substantially-sized DOC pool may shift from degradation to settling, depending on season and POC concentrations\uffe2\uff80\uff94the latter potentially acting to attenuate greenhouse gas emissions from fluvial systems. We finally note that DOC incubations without POC present may yield degradation estimates that do not reflect degradation in the in situ river conditions, and that interaction between dissolved and particulate phases may be important to consider when determining fluvial carbon dynamics and feedbacks under a changing climate.Little is known about the sources and age of C respired by tree roots. Previous research in stems identified two functional pools of non\uffe2\uff80\uff90structural carbohydrates (NSC): an \uffe2\uff80\uff9cactive\uffe2\uff80\uff9d pool supplied directly from canopy photo\uffe2\uff80\uff90assimilates supporting metabolism and a \uffe2\uff80\uff9cstored\uffe2\uff80\uff9d pool used when fresh C supplies are limited. We compared the C isotope composition of water\uffe2\uff80\uff90soluble NSC and respired CO2for aspen roots (Populus tremulahybrids) cut off from fresh C supply after stem\uffe2\uff80\uff90girdling or prolonged incubation of excised roots. We used bomb radiocarbon to estimate the time elapsed since C fixation for respired CO2, water\uffe2\uff80\uff90soluble NSC and structural \uffce\uffb1\uffe2\uff80\uff90cellulose. While freshly excised roots (mostly <2.9\uffe2\uff80\uff89mm in diameter) respired CO2fixed <1\uffc2\uffa0year previously, the age increased to 1.6\uffe2\uff80\uff932.9\uffc2\uffa0year within a week after root excision. Freshly excised roots from trees girdled ~3\uffc2\uffa0months ago had respiration rates and NSC stocks similar to un\uffe2\uff80\uff90girdled trees but respired older C (~1.2\uffc2\uffa0year). We estimate that over 3\uffc2\uffa0months NSC in girdled roots must be replaced 5\uffe2\uff80\uff937 times by reserves remobilized from root\uffe2\uff80\uff90external sources. Using a mixing model and observed correlations between \uffce\uff9414C of water\uffe2\uff80\uff90soluble C and \uffce\uffb1\uffe2\uff80\uff90cellulose, we estimate ~30% of C is \uffe2\uff80\uff9cactive\uffe2\uff80\uff9d (~5\uffc2\uffa0mg C g\uffe2\uff88\uff921).Soil microorganisms act as gatekeepers for soil\uffe2\uff80\uff93atmosphere carbon exchange by balancing the accumulation and release of soil organic matter. However, poor understanding of the mechanisms responsible hinders the development of effective land management strategies to enhance soil carbon storage. Here we empirically test the link between microbial ecophysiological traits and topsoil carbon content across geographically distributed soils and land use contrasts. We discovered distinct pH controls on microbial mechanisms of carbon accumulation. Land use intensification in low-pH soils that increased the pH above a threshold (~6.2) leads to carbon loss through increased decomposition, following alleviation of acid retardation of microbial growth. However, loss of carbon with intensification in near-neutral pH soils was linked to decreased microbial biomass and reduced growth efficiency that was, in turn, related to trade-offs with stress alleviation and resource acquisition. Thus, less-intensive management practices in near-neutral pH soils have more potential for carbon storage through increased microbial growth efficiency, whereas in acidic soils, microbial growth is a bigger constraint on decomposition rates.