NDLI: Effect of open water pools on ecosystem scale surface-atmosphere carbon dioxide exchange in a boreal peatland

Content Provider	Springer Nature Link
Author	Pelletier, Luc Strachan, Ian B. Roulet, Nigel T. Garneau, Michelle Wischnewski, Karoline
Copyright Year	2015
Abstract	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.
Starting Page	291
Ending Page	304
Page Count	14
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	124
Issue Number	1-3
e-ISSN	1573515X
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-04-10
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Peatland Open water pools Carbon dioxide Eddy covariance Source area Biogeosciences Ecosystems Environmental Chemistry Life Sciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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