期刊
SCIENCE ADVANCES
卷 4, 期 8, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaq1689
关键词
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资金
- Fundamental Research Funds for the Central Universities [3102016QD078]
- National Natural Science Foundation of China (NSFC) [41701292]
- China Postdoctoral Science Foundation [2017M610647, 2018T111091]
- Natural Science Basic Research Plan in Shaanxi Province [2017JQ3041]
- State Key Laboratory of Loess and Quaternary Geology [SKLLQG1602]
- Key Laboratory of Aerosol Chemistry and Physics [KLACP-17-02]
- Institute of Earth Environment, Chinese Academy of Sciences
- U.S. Department of Energy [DE-SC00114085]
- NSF [EF 1137293, OIA-1301789]
- NSFC-Yunnan United fund [U1302267]
- National Science Fund for Distinguished Young Scholars [31325005]
- China Scholarship Council
Agricultural and industrial activities have increased atmospheric nitrogen (N) deposition to ecosystems worldwide. N deposition can stimulate plant growth and soil carbon (C) input, enhancing soil C storage. Changes in microbial decomposition could also influence soil C storage, yet this influence has been difficult to discern, partly because of the variable effects of added N on the microbial enzymes involved. We show, using meta-analysis, that added N reduced the activity of lignin-modifying enzymes (LMEs), and that this N-induced enzyme suppression was associated with increases in soil C. In contrast, N-induced changes in cellulase activity were unrelated to changes in soil C. Moreover, the effects of added soil N on LME activity accounted for more of the variation in responses of soil C than a wide range of other environmental and experimental factors. Our results suggest that, through responses of a single enzyme system to added N, soil microorganisms drive long-term changes in soil C accumulation. Incorporating this microbial influence on ecosystem biogeochemistry into Earth system models could improve predictions of ecosystem C dynamics.
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