Soil characteristics determine soil carbon and nitrogen availability during leaf litter decomposition regardless of litter quality |
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| Institution: | 1. Área de Biodiversidad y Conservación, Departamento de Biología y Geología, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, c/ Tulipán s/n, 28933 Móstoles, Spain;2. Hawkesbury Institute for the Environment, University of Western Sydney, Penrith 2751, New South Wales, Australia;3. Centre d''Ecologie Fonctionnelle & Evolutive, CEFE-CNRS, 1919 route de Mende, Montpellier 34293, France;4. Departamento Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Carretera de Utrera km. 1, 41013 Sevilla, Spain;1. Normandie Univ, UNIROUEN, IRSTEA, ECODIV, 76000 Rouen, France;2. Institut de Recherche pour le Développement, UMR Eco & Sols, Montpellier, France;3. INRA, UMR1402 EcoSys, Centre INRA de Versailles-Grignon, France;1. School of Agriculture and Food Science, University of Queensland, 4072, Australia;2. Department of Science, Information Technology and Innovation, Queensland Government, 4001, Australia;3. Centre for Advanced Imaging, University of Queensland, 4072, Australia;4. Department of Agriculture and Fisheries, Queensland Government, 4001, Australia;5. Department of Economic Development, Jobs, Transport and Resources, Hamilton, Victoria, 3300, Australia;6. Department of Economic Development, Jobs, Transport and Resources, Horsham, Victoria, 3400, Australia;1. INRA, UMR 614 Fractionnement des AgroRessources et Environnement, F-51100 Reims, France;2. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83 Umeå, Sweden;3. INRA, UMR 1222 Eco & Sols, F-34060 Montpellier, France;1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, The Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing, 100093, China;2. Key Laboratory of Vegetation Ecology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China;3. Department of Soil Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, D-06120, Halle (Saale), Germany;4. Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle Wittenberg, Am Kirchtor 1, D-06108, Halle (Saale), Germany;5. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany;6. Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Str. 4, D-06120, Halle (Saale), Germany;1. MTA-ELTE-MTM Ecology Research Group, Hungarian Academy of Sciences, c/o Biological Institute, Eötvös Loránd University, Pázmány Péter sétány 1/C, Budapest, 1117, Hungary;2. Laboratory of Biometrics and Quantitative Ecology, Institute of Crop Production, Faculty of Agricultural and Environmental Sciences of Szent István University, Páter K. Str. 1, Gödöllő, 2100, Hungary |
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| Abstract: | Climate and litter quality have been identified as major drivers of litter decomposition, but our knowledge of how soil characteristics (e.g. microbial community and chemical properties) determine carbon (C) and nitrogen (N) availability derived from the decomposition of litter of different qualities is still scarce. We conducted a microcosm experiment to evaluate how soils with contrasting microbial communities and soil properties (denoted Soils A and B hereafter, where Soil B has higher bacterial and fungal abundance, fungal:bacterial ratio, and organic C than Soil A) determine the availability of soil C (carbohydrates, proteins, amino acids and phenols) and N (dissolved organic and inorganic N, microbial biomass N and available N) during the decomposition of litter of contrasting quality (C:N ratios ranging from 20 to 102). We also evaluated the relative importance of soil characteristics and litter quality as drivers of C and N inputs to the soil during this process. Overall, higher soil C and N availability after litter decomposition was found in Soil B than in Soil A. Soil characteristics had a higher positive effect on soil C and N contents than litter quality during litter decomposition. We also found that changes in N availability and organic matter quality registered after litter decomposition, linked to different soil characteristics, were able to promote dissimilarities in the potential mineralization rates. In conclusion, our study provides evidence that soil characteristics (e.g. microbial communities and chemical properties) can be more important than litter quality in determining soil C and equally important for N availability during the decomposition of leaf litter. |
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| Keywords: | Litter C-to-N ratio Depolymerization Mineralization Drylands Dissolved organic N |
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