气候变化领域集成服务门户(CCPortal): Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study

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DOI	10.1073/PNAS.2002780117
	Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study
	Gao Q.; Wang G.; Xue K.; Yang Y.; Xie J.; Yu H.; Bai S.; Liu F.; He Z.; Ning D.; Hobbie S.E.; Reich P.B.; Zhou J.
发表日期	2021
ISSN	00278424
起始页码	33317
结束页码	33324
卷号	117 期号:52
英文摘要	Whether and how CO2 and nitrogen (N) availability interact to influence carbon (C) cycling processes such as soil respiration remains a question of considerable uncertainty in projecting future C–climate feedbacks, which are strongly influenced by multiple global change drivers, including elevated atmospheric CO2 concentrations (eCO2) and increased N deposition. However, because decades of research on the responses of ecosystems to eCO2 and N enrichment have been done largely independently, their interactive effects on soil respiratory CO2 efflux remain unresolved. Here, we show that in a multifactor free-air CO2 enrichment experiment, BioCON (Biodiversity, CO2, and N deposition) in Minnesota, the positive response of soil respiration to eCO2 gradually strengthened at ambient (low) N supply but not enriched (high) N supply for the 12-y experimental period from 1998 to 2009. In contrast to earlier years, eCO2 stimulated soil respiration twice as much at low than at high N supply from 2006 to 2009. In parallel, microbial C degradation genes were significantly boosted by eCO2 at low but not high N supply. Incorporating those functional genes into a coupled C–N ecosystem model reduced model parameter uncertainty and improved the projections of the effects of different CO2 and N levels on soil respiration. If our observed results generalize to other ecosystems, they imply widely positive effects of eCO2 on soil respiration even in infertile systems. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Earth ecosystem model; Elevated CO2; Metagenomics; Nitrogen deposition; Soil respiration
语种	英语
scopus关键词	carbon dioxide; nitrogen; aerobic metabolism; chemistry; computer simulation; grassland; microbiology; soil; Aerobiosis; Carbon Dioxide; Computer Simulation; Grassland; Nitrogen; Soil; Soil Microbiology
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179628
作者单位	State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; Institute for Environmental Genomics, University of Oklahoma, Norman, OK 73019, United States; Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, United States; School of Civil Engineering and Environmental Sciences, University of Oklahoma, Norman, OK 73019, United States; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100190, China; School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan, 410083, China; College of Environmental Science and Engineering, Liaoning Technical University, Fuxin, Liaoning, 123000, China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Deep Sea Science Division, Institute of Deep Sea Science and Engineering, Chinese Academ...
推荐引用方式 GB/T 7714	Gao Q.,Wang G.,Xue K.,et al. Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study[J],2021,117(52).
APA	Gao Q..,Wang G..,Xue K..,Yang Y..,Xie J..,...&Zhou J..(2021).Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study.Proceedings of the National Academy of Sciences of the United States of America,117(52).
MLA	Gao Q.,et al."Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study".Proceedings of the National Academy of Sciences of the United States of America 117.52(2021).