DOI: 10.1007/s10533-015-0109-0
Scopus记录号: 2-s2.0-84938290486
论文题名: Controls of spatial and temporal variability in CH<inf>4</inf> flux in a high arctic fen over three years
作者: Ström L. ; Falk J.M. ; Skov K. ; Jackowicz-Korczynski M. ; Mastepanov M. ; Christensen T.R. ; Lund M. ; Schmidt N.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 1 起始页码: 21
结束页码: 35
语种: 英语
英文关键词: Arctic wetlands
; CH4 flux
; Eriophorum
; Spatial variability
; Substrate availability
Scopus关键词: arctic environment
; biotic factor
; carbon balance
; carbon dioxide
; fen
; growing season
; methane
; net ecosystem exchange
; net primary production
; spatiotemporal analysis
; substrate
; vascular plant
; Eriophorum
; Ovibos
; Tracheophyta
英文摘要: The aim of this study was to establish the main drivers of the spatial variability in growing season CH4 flux within an arctic wetland ecosystem. During 3 years (2011–2013) we measured CH4 flux and potential drivers, e.g., CO2 fluxes (net ecosystem exchange (NEE), gross primary productivity (GPP) and ecosystem respiration), temperature, water table depth, pore-water concentration of organic acids (e.g., acetate) and the vascular plant composition and density. The study included 16–20 main plots (Cmain ) and in 2013 also experimental plots (10 excluded muskoxen grazing, 9 snow fence and 10 automated chamber plots) distributed over 0.3 km2. The results show a 1.8-times difference in CH4 flux magnitude inter-annually and 9- to 35-times spatially (depending on year and treatment). During all 3 years GPP was a strong driver of the variability in Cmain plots. Accordingly, the plant productivity related variables NEE, GPP and acetate were singled out as the strongest drivers of the variability in 2013, when all variables were measured on a majority of the plots. These variables were equally strong drivers of the spatial variability in CH4 flux regardless of whether experimental plots were included in the analysis or not. The density of Eriophorumscheuchzeri was the strongest driver of the spatial variability in NEE, GPP and acetate. In conclusion, changes in vegetation composition or productivity of wet arctic ecosystems will have large impacts on their carbon balance and CH4 flux, irrespective of whether these changes are driven directly by climate change or by biotic interactions, such as grazing. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83487
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Physical Geography and Ecosystem Science, Lund University, Sölvegatan 12, Lund, Sweden; Department of Bioscience, Arctic Research Centre, Aarhus University, Frederiksborgvej 399, Roskilde, Denmark
Recommended Citation:
Ström L.,Falk J.M.,Skov K.,et al. Controls of spatial and temporal variability in CH<inf>4</inf> flux in a high arctic fen over three years[J]. Biogeochemistry,2015-01-01,125(1)