The contribution of biogas residues to soil organic matter formation and CO2 emissions in an arable soil |
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| Institution: | 1. UFZ-Helmholtz Centre for Environmental Research, Department of Bioenergy, Permoserstr. 15, 04318 Leipzig, Germany;2. UFZ-Helmholtz Centre for Environmental Research, Department of Environmental Biotechnology, Permoserstr. 15, 04318 Leipzig, Germany;3. Organic Geochemistry Group, MARUM - Centre for Marine Environmental Sciences & Department of Geosciences, University of Bremen, 28359 Bremen, Germany;1. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;2. Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;3. Land and Environment, AgResearch, Hamilton 3240, New Zealand;4. Global Institute for Environmental Research, University of Newcastle, NSW 2308, Australia;1. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China;2. Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, 410082, PR China;3. Suxian District Forestry Bureau, Chenzhou, 423000, PR China;4. Shenzhen Landmark Biotechnology Co., Ltd, Shenzhen, 518000, PR China;1. Faculty of Agriculture and Environment, The University of Sydney, NSW 2006, Australia;2. NSW Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, NSW 2568, Australia;1. Eco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China;2. Shanghai Engineering Research Center of Low-carbon Agriculture (SERCLA), Shanghai 201415, China |
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| Abstract: | The biogas production process generates as side-products biogas residues containing microbial biomass which could contribute to soil organic matter formation or induce CO2 emissions when applied to arable soil as fertilizer. Using an isotope labelling approach, we labelled the microbial biomass in biogas residues, mainly G+ bacteria and methanogenic archaea via KH13CO3, and traced the fate of microbial biomass carbon in soil with an incubation experiment lasting 378 days. Within the first seven days, 40% of the carbon was rapidly mineralized and after that point mineralization continued, reaching 65% by the end of the experiment. Carbon mineralization data with 93% recovery could be fitted to a two-pool degradation model which estimated proportions and degradation rate constants of readily and slowly degrading pools. About 49% of the carbon was in the slowly degrading pool with a half-life of 1.9 years, suggesting mid-term contribution to living and non-living soil organic matter formation. Biogas residues caused a priming effect at the beginning, thus their intensive application should be avoided. |
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| Keywords: | Biogas residues Soil organic matter Mineralization Microbial biomass |
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