DOI: 10.1111/gcb.12247
论文题名: Spatial variation in landscape-level CO2 and CH4 fluxes from arctic coastal tundra: Influence from vegetation, wetness, and the thaw lake cycle
作者: Sturtevant C.S. ; Oechel W.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 9 起始页码: 2853
结束页码: 2866
语种: 英语
英文关键词: Alaska
; Carbon dioxide
; Eddy covariance
; Methane
; Normalized difference red edge index
; Normalized difference vegetation index
; Tasseled Cap Transformation
; Upscaling
Scopus关键词: carbon dioxide
; methane
; water
; arctic environment
; carbon dioxide
; carbon flux
; chronosequence
; eddy covariance
; methane
; NDVI
; primary production
; remote sensing
; spatial variation
; tundra
; upscaling
; Arctic
; article
; chemistry
; Eddy covariance
; lake
; normalized difference red edge index
; normalized difference vegetation index
; plant
; Tasseled Cap Transformation
; United States
; upscaling
; Alaska
; carbon dioxide
; eddy covariance
; methane
; normalized difference red edge index
; normalized difference vegetation index
; Tasseled Cap Transformation
; upscaling
; Arctic Regions
; Carbon Dioxide
; Lakes
; Methane
; Plants
; Water
; Alaska
; Barrow
; United States
英文摘要: Regional quantification of arctic CO2 and CH4 fluxes remains difficult due to high landscape heterogeneity coupled with a sparse measurement network. Most of the arctic coastal tundra near Barrow, Alaska is part of the thaw lake cycle, which includes current thaw lakes and a 5500-year chronosequence of vegetated thaw lake basins. However, spatial variability in carbon fluxes from these features remains grossly understudied. Here, we present an analysis of whole-ecosystem CO2 and CH4 fluxes from 20 thaw lake cycle features during the 2011 growing season. We found that the thaw lake cycle was largely responsible for spatial variation in CO2 flux, mostly due to its control on gross primary productivity (GPP). Current lakes were significant CO2 sources that varied little. Vegetated basins showed declining GPP and CO2 sink with age (R2 = 67% and 57%, respectively). CH4 fluxes measured from a subset of 12 vegetated basins showed no relationship with age or CO2 flux components. Instead, higher CH4 fluxes were related to greater landscape wetness (R2 = 57%) and thaw depth (additional R2 = 28%). Spatial variation in CO2 and CH4 fluxes had good satellite remote sensing indicators, and we estimated the region to be a small CO2 sink of -4.9 ± 2.4 (SE) g C m-2 between 11 June and 25 August, which was countered by a CH4 source of 2.1 ± 0.2 (SE) g C m-2. Results from our scaling exercise showed that developing or validating regional estimates based on single tower sites can result in significant bias, on average by a factor 4 for CO2 flux and 30% for CH4 flux. Although our results are specific to the Arctic Coastal Plain of Alaska, the degree of landscape-scale variability, large-scale controls on carbon exchange, and implications for regional estimation seen here likely have wide relevance to other arctic landscapes. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62343
Appears in Collections: 影响、适应和脆弱性
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作者单位: Global Change Research Group, Department of Biology, San Diego State University, San Diego, CA, United States
Recommended Citation:
Sturtevant C.S.,Oechel W.C.. Spatial variation in landscape-level CO2 and CH4 fluxes from arctic coastal tundra: Influence from vegetation, wetness, and the thaw lake cycle[J]. Global Change Biology,2013-01-01,19(9)