globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13661
论文题名:
Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw
作者: Mauritz M.; Bracho R.; Celis G.; Hutchings J.; Natali S.M.; Pegoraro E.; Salmon V.G.; Schädel C.; Webb E.E.; Schuur E.A.G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:9
起始页码: 3646
结束页码: 3666
语种: 英语
英文关键词: Arctic ; carbon ; ecosystem respiration ; experimental warming ; gross primary productivity ; net ecosystem exchange ; permafrost ; thaw ; tundra
Scopus关键词: Eriophorum vaginatum
英文摘要: Rapid Arctic warming is expected to increase global greenhouse gas concentrations as permafrost thaw exposes immense stores of frozen carbon (C) to microbial decomposition. Permafrost thaw also stimulates plant growth, which could offset C loss. Using data from 7 years of experimental Air and Soil warming in moist acidic tundra, we show that Soil warming had a much stronger effect on CO2 flux than Air warming. Soil warming caused rapid permafrost thaw and increased ecosystem respiration (Reco), gross primary productivity (GPP), and net summer CO2 storage (NEE). Over 7 years Reco, GPP, and NEE also increased in Control (i.e., ambient plots), but this change could be explained by slow thaw in Control areas. In the initial stages of thaw, Reco, GPP, and NEE increased linearly with thaw across all treatments, despite different rates of thaw. As thaw in Soil warming continued to increase linearly, ground surface subsidence created saturated microsites and suppressed Reco, GPP, and NEE. However Reco and GPP remained high in areas with large Eriophorum vaginatum biomass. In general NEE increased with thaw, but was more strongly correlated with plant biomass than thaw, indicating that higher Reco in deeply thawed areas during summer months was balanced by GPP. Summer CO2 flux across treatments fit a single quadratic relationship that captured the functional response of CO2 flux to thaw, water table depth, and plant biomass. These results demonstrate the importance of indirect thaw effects on CO2 flux: plant growth and water table dynamics. Nonsummer Reco models estimated that the area was an annual CO2 source during all years of observation. Nonsummer CO2 loss in warmer, more deeply thawed soils exceeded the increases in summer GPP, and thawed tundra was a net annual CO2 source. © 2017 John Wiley & Sons Ltd
资助项目: We would like to thank J. Ledman, numerous invaluable field technicians, and the staff at Bonanza Creek LTER for continued field and logistical support. This project would not be possible without their help. The NAU statistical consulting lab and discussions with C. Plaza advanced the analysis of this data set. Funding for this research was provided by: U.S. Department of Energy, Office of Biological and Environmental Research, Terrestrial Ecosystem Science (TES) Program ; National Science Foundation CAREER program ; National Parks Inventory and Monitoring Program ; National Science Foundation Bonanza Creek LTER program.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60813
Appears in Collections:影响、适应和脆弱性

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作者单位: Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, United States; School of Forest Resources and Conservation, University of Florida, Gainesville, FL, United States; Department of Geological Sciences, University of Florida, Gainesville, FL, United States; Woods Hole Research Center, Falmouth, MA, United States; Environmental Sciences Division and Climate Change Sciences Institute, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Department of Biology, University of Florida, Gainesville, FL, United States

Recommended Citation:
Mauritz M.,Bracho R.,Celis G.,et al. Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw[J]. Global Change Biology,2017-01-01,23(9)
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