DOI: 10.1016/j.atmosenv.2014.02.034
Scopus记录号: 2-s2.0-84896808392
论文题名: The spatial and temporal relationships between CO2 and CH4 exchange in a temperate ombrotrophic bog
作者: Lai D ; Y ; F ; , Roulet N ; T ; , Moore T ; R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 89 起始页码: 249
结束页码: 259
语种: 英语
英文关键词: Carbon dioxide
; Cross-correlation
; Methane
; Ombrotrophic peatland
Scopus关键词: Cross correlations
; Gross ecosystem productions
; Interannual variability
; Peatland
; Spatial variations
; Species composition
; Temporal coupling
; Temporal relationships
; Ecosystems
; Groundwater
; Methane
; Wetlands
; Carbon dioxide
; carbon dioxide
; methane
; atmosphere-biosphere interaction
; biogeochemistry
; carbon dioxide
; flux measurement
; grass
; growing season
; herb
; methane
; methanogenesis
; net ecosystem production
; ombrotrophic environment
; phenology
; photosynthesis
; plant community
; sedge
; spatiotemporal analysis
; temperate environment
; article
; Canada
; controlled study
; deciduous plant
; ecosystem
; Eriophorum
; growing season
; Maianthemum
; methanogenesis
; nonhuman
; peatland
; photosynthate
; photosynthesis
; priority journal
; Rhododendron
; species composition
; Sphagnum
; temperature
; turnover time
; vascular plant
; water table
; Canada
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: We investigate the relationships between CO2 and CH4 fluxes across space and time at a temperate ombrotrophic bog in Canada to assess the coupling between plant production and CH4 emissions. Based on periodic manual chamber measurements, we show that maximum net ecosystem CO2 exchange (NEEmax) was a good predictor of the spatial variations in CH4 flux among the wetter Eriophorum and lawn sites (r2=0.61-0.88), but not the drier hummock sites (r2=0.04-0.49). Also, we observed large interannual variability in the NEEmax-CH4 relationship at the Eriophorum and lawn sites, with a smaller regression slope in 2010 that had a seasonal mean water table 8cm lower than in 2009. Results of cross-correlation of instantaneous gross ecosystem production (GEP) and CH4 flux from autochambers show a moderate relationship (σ=-0.31) in the Eriophorum community at a lag of 9-12h, suggesting a rapid turnover of recent photosynthate for methanogenesis. On the other hand, we found in two Maianthemum-dominated chambers that the temperature-independent residuals of daily mean CH4 flux lagged behind GEP by 18-26 days at the seasonal scale. The lagged correlations between GEP and CH4 flux by month were particularly strong in the late growing season in the Eriophorum and Maianthemum/Ledum communities. Our results suggest the presence of spatial and temporal coupling of plant production and CH4 emissions in this bog, whose strength varies with species composition, water table position, and plant phenology. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80675
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; Department of Geography and Global Environmental and Climate Change Centre, McGill University, Montreal, QC, H3A 0B9, Canada
Recommended Citation:
Lai D,Y,F,et al. The spatial and temporal relationships between CO2 and CH4 exchange in a temperate ombrotrophic bog[J]. Atmospheric Environment,2014-01-01,89