期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 644, 期 -, 页码 1286-1291出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.07.055
关键词
Amino sugars; Microbial residues; Soil carbon; Climate change; Temperate steppe
资金
- Natural Science Foundation of China [41630862]
- China Soil Microbiome Initiative: Function and regulation of soil-microbial systems of the Chinese Academy of Sciences [XDB15040200]
- CAS Interdisciplinary Innovation Team
Microbial residues play important role in regulating soil carbon (C) turnover and stability, but the responses of microbial residues to climate change are neglected. In this study, a 5-year field experiment that simulated two climate change factors (precipitation and warming) was performed to examine microbial residue changes in a semiarid grassland, with water limitation. Both the contents of total amino sugars (a biomarker of microbial residues) and glucosamine (a biomarker of fungal residues) increased significantly with increased precipitation and decreased under warming, whereas neither increased precipitation nor warming influenced the content of muramic acid (a biomarker of bacterial residues). These findings clarified the role of fungal residues in determining the response of microbial residues to altered water availability and plant productivity induced by increased precipitation and elevated temperature. Interestingly, microbial residues had a much greater response to climate change than total soil C, implying that soil C composition and stability altered prior to soil C storage and simultaneously slowed down the change of soil C pool. Integrating microbial residues into current climate-Cmodels is expected to enable the models to more accurately evaluate soil C responses to climate regimes in semiarid grasslands. (C) 2018 Elsevier B.V. All rights reserved.
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