Impact of landuse change on the molecular composition of soil organic matter |
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| Institution: | 1. University Giessen, Animal Ecology & Systematic Zoology, Heinrich Buff Ring 29, D-35392 Giessen, Germany;2. Max Planck Institute for Biogeochemistry, POB 100164, 07701 Jena, Germany;3. Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Univ. of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl-von-Ossietzky-Str. 9-11, 26111 Oldenburg, Germany;4. University Giessen, Landscape Ecology & Resources Management, Res Ctr BioSyst Land Use & Nutr IFZ, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany;5. Limnological River Station of the Max Planck Institute for Limnology, Schlitz, Germany;1. Division of Natural Resource Management, ICAR- Research Complex for NEH Region, Umiam, Shillong, Meghalaya, India;2. Global Centre for Environmental Remediation (GCER), Advanced Technology Centre, Faculty of Science, The University of Newcastle, Callaghan, Newcastle, NSW, Australia;3. Department of Agronomy, 2004 Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS, United States;4. Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute (IARI), New Delhi, India;5. ICAR-National Academy of Agriculture Research Management, Hyderabad, Telangana, India;6. Department of Soil Science, Kerala Forest Research Institute, Thrissur, Kerala, India;7. Laboratory of Soil- and Groundwater-Management, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, University of Wuppertal, Wuppertal, Germany;8. Department of Environment, Energy and Geoinformatics, Sejong University, Seoul, Republic of Korea;9. Divison of Environmental Science and Ecological Engineering, Korea Biochar Research Center, Korea University, Seoul, South Korea;10. Biochar Engineering Technology Research Center of Guangdong Province, School of Environment and Chemical Engineering, Foshan University, Foshan, China;11. Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A & F University, Hangzhou, China;12. Department of Animal, Plant and Soil Sciences, Centre for AgriBioscience, La Trobe University (Melbourne Campus), Melbourne, VIC, Australia;13. Institute of Surface-Earth System Science, Tianjin University, Tianjin, China;14. Cooperative Extension Service, Central State University, Wilberforce, OH, United States;1. Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China;2. Department of Biology, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium;3. CNRS-INRA, UMR7618, BioEMCo, Bâtiment EGER, Campus AgroParisTech, 78850 Thiverval-Grignon, France;4. Graduate University of the Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | The conversion of grassland into cultivated land is a common agricultural practice, generally leading to the decrease of the soil organic matter (SOM) content. In this study, we analysed quantitative changes in carbon content. Additionally qualitative changes occurring in the soil organic matter composition on a molecular basis were assessed using Curiepoint pyrolysis coupled to gas chromatography and mass spectrometry (pyrolysis GC/MS). The aim of the study was to follow the development of SOM in grassland soil, after conversion into arable soil.Soil was sampled before the conversion (0 month) as well as 3 months, and 1 year after the conversion. The samples were treated with 10% HF to remove mineral material before being subjected to analysis of the bulk chemical composition by pyrolysis GC/MS. The relative contributions of single molecules were obtained by the integration of the total ion chromatogram.Pyrolysis products derived from lignins, proteins and polysaccharides were identified in all samples. SOM under grassland, arable land and converted grassland released similar pyrolysis products. Three months after the conversion, lignin-derived pyrolysis products were found at lower concentrations in the converted grassland soil. Principal component analysis showed that arable land, grassland and the converted grassland could be distinguished using the score plot of the 2nd and 3rd principal components. The differences induced by grassland conversion are only transitory and 1 year after the conversion, SOM has a similar composition as SOM of the initial grassland soil. |
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