Linking soil O2, CO2, and CH4 concentrations in a wetland soil: Implications for CO2 and CH 4 fluxes

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Show simple item record Elberling, B Askaer, L Jørgensen, CJ Joensen, HP Kühl, M Glud, RN Lauritsen, FR 2012-10-12T03:33:38Z 2011-04-15
dc.identifier.citation Environmental Science and Technology, 2011, 45 (8), pp. 3393 - 3399
dc.identifier.issn 0013-936X
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 high-resolution 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 CH 4 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, O 2 consumption exceeded CO2 production, indicating CO 2 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. © 2011 American Chemical Society.
dc.language eng
dc.relation.isbasedon 10.1021/es103540k
dc.title Linking soil O2, CO2, and CH4 concentrations in a wetland soil: Implications for CO2 and CH 4 fluxes
dc.type Journal Article
dc.description.version Published
dc.parent Environmental Science and Technology
dc.journal.volume 8
dc.journal.volume 45
dc.journal.number 8 en_US
dc.publocation Washington, USA en_US
dc.publocation Perth, Australia
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.conference ANZMAC
dc.for 0502 Environmental Science and Management
dc.for 0703 Crop and Pasture Production
dc.personcode 107129
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 2011-11-28
dc.location.activity en_US
dc.location.activity Perth, Australia
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)

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