Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13661 |
Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw | |
Mauritz, Marguerite1; Bracho, Rosvel2; Celis, Gerardo1; Hutchings, Jack3; Natali, Susan M.4; Pegoraro, Elaine1; Salmon, Verity G.5,6; Schadel, Christina1; Webb, Elizabeth E.7; Schuur, Edward A. G.1 | |
2017-09-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. |
英文关键词 | Arctic carbon ecosystem respiration experimental warming gross primary productivity net ecosystem exchange permafrost thaw tundra |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000406812100019 |
WOS关键词 | ALASKAN ARCTIC TUNDRA ; CLIMATE-CHANGE ; CARBON-DIOXIDE ; ECOSYSTEM RESPIRATION ; AUTOTROPHIC RESPIRATION ; NITROGEN AVAILABILITY ; WARMING PERMAFROST ; ORGANIC-MATTER ; GROWING-SEASON ; SOIL CARBON |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17496 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA; 2.Univ Florida, Sch Forest Resources & Conservat, Gainesville, FL 32611 USA; 3.Univ Florida, Dept Geol Sci, Gainesville, FL USA; 4.Woods Hole Res Ctr, Falmouth, MA USA; 5.Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA; 6.Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN USA; 7.Univ Florida, Dept Biol, Gainesville, FL USA |
推荐引用方式 GB/T 7714 | Mauritz, Marguerite,Bracho, Rosvel,Celis, Gerardo,et al. Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw[J]. GLOBAL CHANGE BIOLOGY,2017,23(9). |
APA | Mauritz, Marguerite.,Bracho, Rosvel.,Celis, Gerardo.,Hutchings, Jack.,Natali, Susan M..,...&Schuur, Edward A. G..(2017).Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw.GLOBAL CHANGE BIOLOGY,23(9). |
MLA | Mauritz, Marguerite,et al."Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw".GLOBAL CHANGE BIOLOGY 23.9(2017). |
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