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Methane fluxes during the initiation of a large-scale water table manipulation experiment in the Alaskan Arctic tundra

Zona, D.; Oechel, W. C.; Kochendorfer, J.; Paw U, K. T.; Salyuk, A. N.; Olivas, P. C.; Oberbauer, S. F. and Lipson, D. A. (2009). Methane fluxes during the initiation of a large-scale water table manipulation experiment in the Alaskan Arctic tundra. Global Biogeochemical Cycles, 23(2), article no. GB2013.

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URL: http://dx.doi.org/10.1029/2009GB003487
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Abstract

Much of the 191.8 Pg C in the upper 1 m of Arctic soil of Arctic soil organic mater is, or is at risk of, being released to the atmosphere as CO2 and/or CH4. Global warming will further alter the rate of emission of these gases to the atmosphere. Here we quantify the effect of major environmental variables affected by global climate change on CH4 fluxes in the Alaskan Arctic. Soil temperature best predicts CH4 fluxes and explained 89% of the variability in CH4 emissions. Water table depth has a nonlinear impact on CH4 efflux. Increasing water table height above the surface retards CH4 efflux. Decreasing water table depth below the surface has a minor effect on CH4 release once an aerobic layer is formed at the surface. In contrast with several other studies, we found that CH4 emissions are not driven by net ecosystem exchange (NEE) and are not limited by labile carbon supply.

Item Type: Journal Item
Copyright Holders: 2009 The American Physical Union
ISSN: 0886-6236
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 38753
Depositing User: Astrid Peterkin
Date Deposited: 29 Oct 2013 12:08
Last Modified: 07 Dec 2018 20:32
URI: http://oro.open.ac.uk/id/eprint/38753
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