{"type": "FeatureCollection", "features": [{"id": "10.1007/s10533-015-0169-1", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:15:03Z", "type": "Journal Article", "created": "2015-12-09", "title": "Elevated Co2 Increased Phosphorous Loss From Decomposing Litter And Soil Organic Matter At Two Face Experiments With Trees", "description": "Sustained increased productivity of trees growing in elevated CO2 depends in part on their stoichiometric flexibility, i.e., increasing their nutrient use efficiency, or on increased nutrient uptake from the soil. Phosphorus (P) may be a nutrient as limiting as nitrogen (N) in terrestrial ecosystems and may play a key-process in global terrestrial C storage. For this study archived litter and soil samples of two free air CO2 enrichment (FACE) experiments were analyzed for C, N and P. Populus euramericana, nigra and alba and Betula pendula, Alnus glutinosa and Fagus sylvatica were grown in ambient and elevated CO2 at respectively the Euro- and BangorFACE experiments. At EuroFACE, aboveground litter accumulated in L, F and H layers, while at BangorFACE almost all aboveground litter was incorporated into the mineral soil due to bioturbation. At EuroFACE, more P was lost from the F and H litter layers due to trees growing in elevated CO2, while at BangorFACE more P was lost from the mineral soil. Results of this study imply that trees growing in elevated CO2 were P limited at both experiments. Therefore, with increasing atmospheric CO2, P may play a more pronounced role than previous thought in regulating secondary forest growth. Moreover, increased atmospheric CO2 and ample N may allow a larger pool of P to become available for uptake due to, for instance, increased phosphatase activity resulting in increased organic matter turnover and biogenic weathering. Therefore, it may be postulated that under non-N-limited conditions, e.g., during regrowth, under high N deposition or in systems with high N2-fixation, increased P availability and uptake may allow P-limited forests to sustain increased growth under increasing atmospheric CO2.", "keywords": ["0106 biological sciences", "4. Education", "Litter and soil stoichiometry", "04 agricultural and veterinary sciences", "15. Life on land", "Soil phosphorous", "01 natural sciences", "Secondary forest growth", "13. Climate action", "Elevated CO", "Environmental Chemistry", "0401 agriculture", " forestry", " and fisheries", "FACE experiment", "Earth-Surface Processes", "Water Science and Technology"], "contacts": [{"organization": "Hoosbeek, Marcel R.", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s10533-015-0169-1"}, {"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/s10533-015-0169-1", "name": "item", "description": "10.1007/s10533-015-0169-1", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10533-015-0169-1"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-12-08T00:00:00Z"}}, {"id": "10.1890/03-5055", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-07-25T16:20:00Z", "type": "Journal Article", "created": "2007-06-06", "title": "Soil Nitrogen Cycling Under Elevated Co2: A Synthesis Of Forest Face Experiments", "description": "<p>The extent to which greater net primary productivity (NPP) will be sustained as the atmospheric CO2 concentration increases will depend, in part, on the long\uffe2\uff80\uff90term supply of N for plant growth. Over a two\uffe2\uff80\uff90year period, we used common field and laboratory methods to quantify microbial N, gross N mineralization, microbial N immobilization, and specific microbial N immobilization in three free\uffe2\uff80\uff90air CO2 enrichment experiments (Duke Forest, Oak Ridge, Rhinelander). In these experiments, elevated atmospheric CO2 has increased the input of above\uffe2\uff80\uff90 and belowground litter production, which fuels heterotrophic metabolism in soil. Nonetheless, we found no effect of atmospheric CO2 concentration on any microbial N cycling pool or process, indicating that greater litter production had not initially altered the microbial supply of N for plant growth. Thus, we have no evidence that changes in plant litter production under elevated CO2 will initially slow soil N availability and produce a negative feedback on NPP. Understanding the time scale over which greater plant production modifies microbial N demand lies at the heart of our ability to predict long\uffe2\uff80\uff90term changes in soil N availability and hence whether greater NPP will be sustained in a CO2\uffe2\uff80\uff90enriched atmosphere.</p>", "keywords": ["2. Zero hunger", "0106 biological sciences", "elevated CO2", "soil microorganisms", "Science", "Ecology and Evolutionary Biology", "microbial immobilization", "04 agricultural and veterinary sciences", "soil N cycling", "15. Life on land", "01 natural sciences", "6. Clean water", "climate change", "gross N mineralization", "13. 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