DOI: 10.1007/s10533-015-0098-z
Scopus记录号: 2-s2.0-84930673924
论文题名: Effect of open water pools on ecosystem scale surface-atmosphere carbon dioxide exchange in a boreal peatland
作者: Pelletier L. ; Strachan I.B. ; Roulet N.T. ; Garneau M. ; Wischnewski K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 124, 期: 2018-01-03 起始页码: 291
结束页码: 304
语种: 英语
英文关键词: Carbon dioxide
; Eddy covariance
; Open water pools
; Peatland
; Source area
Scopus关键词: boreal forest
; carbon dioxide
; community structure
; eddy covariance
; environmental conditions
; heterogeneity
; net ecosystem exchange
; open water
; peatland
; plant community
; subarctic region
; surface flux
; Picea mariana
; Sphagnum
英文摘要: Peatland carbon dioxide (CO2 ) exchange can vary spatially over a few meters because of the heterogeneity in plant communities, differing responses to environmental conditions, and the presence of pools in patterned peatlands. In contrast to the plant communities comprising a peatland’s vegetated surface, permanent pools that are characteristic of peatlands in temperate to subarctic regions are net sources of CO2 to the atmosphere. Measurements of net ecosystem CO2 exchange using the eddy covariance (EC) technique over peatlands without permanent pools do not show the smaller plant scale spatial heterogeneity in fluxes because the atmosphere mixes the variations in fluxes over the EC tower source area. However, if different vegetation communities and pools approach the spatial scale that they form a significant proportion of an EC tower’s source area, such as might be the case in peatlands with pools, they should be able to be discriminated if the surface fluxes by cover type are significantly different. In the present study, we evaluate if the observed variability in peatland surface CO2 exchange can be identified from 30-min net ecosystem CO2 exchange measurements using the proportion of the different plant communities or pools within the eddy covariance tower source area. Our results show that the variability in CO2 exchange at the local scale across the peatland surface has a measureable impact on the ecosystem level measurement, primarily when open water pools are present within the tower source area. Our results also suggest that large CO2 exchange rates measured above Sphagnum spp. hummocks with Picea mariana, combined with their large fractional contribution to the source area, counterbalanced the CO2 loss from the open water pools, explaining why the ecosystem as a whole was a net CO2 sink during the measurement period. © 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/83513
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 Natural Resource Sciences, McGill University, Sainte-Anne-de-Bellevue, QC, Canada; GEOTOP Research Center, Université du Québec à Montréal, Montréal, QC, Canada; Global Environmental and Climate Change Centre, McGill University, Montréal, QC, Canada; Department of Geography, McGill University, Montréal, QC, Canada; Département de Géographie, Université du Québec à Montréal, Montréal, QC, Canada; Département de Géographie, Université de Montréal, Montréal, QC, Canada
Recommended Citation:
Pelletier L.,Strachan I.B.,Roulet N.T.,et al. Effect of open water pools on ecosystem scale surface-atmosphere carbon dioxide exchange in a boreal peatland[J]. Biogeochemistry,2015-01-01,124(2018-01-03)