Linking soil O2, CO2, and CH4 concentrations in a wetland soil: Implications for CO2 and CH4 fluxes

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Show simple item record Elberling, Bo en_US Askaer, Louise en_US J??Rgensen, Christian en_US Joensen, Hans en_US Kuhl, Michael en_US Glud, Ronnie en_US Lauritsen, Frants en_US
dc.contributor.editor en_US 2012-10-12T03:33:38Z 2012-10-12T03:33:38Z 2011 en_US
dc.identifier 2010002505 en_US
dc.identifier.citation Elberling Bo et al. 2011, 'Linking soil O2, CO2, and CH4 concentrations in a wetland soil: Implications for CO2 and CH4 fluxes', American Chemical Scoiety, vol. 45, no. 8, pp. 3393-3399. en_US
dc.identifier.issn 0013-936X en_US
dc.identifier.other C1 en_US
dc.description.abstract Oxygen (O2) availability and diffusivity in wetlands are controlling factors for the production and consumption of both carbon dioxide (CO2) and methane (CH4) in the subsoil and thereby potential emission of these greenhouse gases to the atmosphere. To examine the linkage between highresolution spatiotemporal trends in O2 availability and CH4/CO2 dynamics in situ, we compare high-resolution subsurface O2 concentrations, weekly measurements of subsurface CH4/CO2 concentrations and near continuous flux measurements of CO2 and CH4. Detailed 2-D distributions of O2 concentrations and depth-profiles of CO2 and CH4 were measured in the laboratory during flooding of soil columns using a combination of planar O2 optodes and membrane inlet mass spectrometry. Microsensors were used to assess apparent diffusivity under both field and laboratory conditions. Gas concentration profiles were analyzed with a diffusion-reaction model for quantifying production/ consumption profiles of O2, CO2, and CH4. In drained conditions, O2 consumption exceeded CO2 production, indicating CO2 dissolution in the remaining water-filled pockets. CH4 emissions were negligible when the oxic zone was >40 cm and CH4 was presumably consumed below the depth of detectable O2. In flooded conditions, O2 was transported by other mechanisms than simple diffusion in the aqueous phase. This work demonstrates the importance of changes in near-surface apparent diffusivity, microscale O2 dynamics, as well as gas transport via aerenchymous plants tissue on soil gas dynamics and greenhouse gas emissions following marked changes in water level. en_US
dc.language en_US
dc.publisher American Chemical Scoiety en_US
dc.relation.isbasedon en_US
dc.title Linking soil O2, CO2, and CH4 concentrations in a wetland soil: Implications for CO2 and CH4 fluxes en_US
dc.parent Environmental Science & Technology en_US
dc.journal.volume 45 en_US
dc.journal.number 8 en_US
dc.publocation Washington, USA en_US
dc.identifier.startpage 3393 en_US
dc.identifier.endpage 3399 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 070300 en_US
dc.personcode 0000064082 en_US
dc.personcode 0000064081 en_US
dc.personcode 0000067496 en_US
dc.personcode 0000064084 en_US
dc.personcode 107129 en_US
dc.personcode 0000061174 en_US
dc.personcode 0000064083 en_US
dc.percentage 50 en_US Crop and Pasture Production en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords en_US

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