NDLI: Linking rhizospheric CH$_{4}$ oxidation and net CH$_{4}$ emissions in an arctic wetland based on $^{13}$CH$

Content Provider	Springer Nature Link
Author	Nielsen, Cecilie Skov Michelsen, Anders Ambus, Per Deepagoda, T. K. K. Chamindu Elberling, Bo
Copyright Year	2016
Abstract	Poorly drained arctic ecosystems are potential large emitters of methane (CH$_{4}$) due to their high soil organic carbon content and low oxygen availability. In wetlands, aerenchymatous plants transport CH$_{4}$ from the soil to the atmosphere, but concurrently transport O$_{2}$ to the rhizosphere, which may lead to oxidation of CH$_{4}$. The importance of the latter process is largely unknown for arctic plant species and ecosystems. Here, we aim to quantify the subsurface oxidation of CH$_{4}$ in a waterlogged arctic ecosystem dominated by Carex aquatilis ssp. stans and Eriophorum angustifolium, and evaluate the overall effect of these plants on the CH$_{4}$ budget.A mesocosms study was established based on the upper 20 cm of an organic soil profile with intact plants retrieved from a peatland in West Greenland (69°N). We measured dissolved concentrations and emissions of $^{13}$CO$_{2}$ and $^{13}$CH$_{4}$ from mesocosms during three weeks after addition of $^{13}$C-enriched CH$_{4}$ below the mesocosm.Most of the recovered $^{13}$C label (>98 %) escaped the ecosystem as CH$_{4}$, while less than 2 % was oxidized to $^{13}$CO$_{2}$.It is concluded that aerenchymatous plants control the overall CH$_{4}$ emissions but, as a transport system for oxygen, are too inefficient to markedly reduce CH$_{4}$ emissions.
Starting Page	201
Ending Page	213
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	412
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-09-27
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carex Greenhouse gases Methane Oxidation Stable isotopes Tundra Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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