期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 91, 期 -, 页码 58-64出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2015.08.027
关键词
Biogas residues; Soil organic matter formation; Fatty acids
类别
资金
- Helmholtz Association of German Research Centres within the framework of the program 'Energy and Land Use' of the Department of Bioenergy (UFZ)
- graduate school HIGRADE
Biogas residues are rich in microbial biomass and contribute to organic matter formation when applied to soils. Here we present a detailed analysis of the fatty acids derived from C-13-labelled biogas residues applied to arable soil and incubated for 378 days. We applied a differential approach using phospholipid fatty acids and total fatty acids to evaluate the carbon dynamics in living biomass and non-living soil organic matter. Biogas residue addition increased the microbial biomass in soil. The sum of C-13-labelled phospholipid fatty acids decreased to similar to 60% during incubation whereas the decrease of t-FA was higher (to 33%). Compound-specific fatty acid analysis showed fatty acid specific incorporation or loss of C-13, indicating hints for the carbon flow within the microbial food web. Overall, microbial biomass in biogas residues may be a significant contributor to soil organic matter formation. (C) 2015 Elsevier Ltd. All rights reserved.
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