Carbon dioxide and methane emissions from a wet-dry tropical floodplain in Northern Australia

Bass, A.M., O'Grady, D., Leblanc, M., Tweed, S., Nelson, P.N., and Bird, M.I. (2014) Carbon dioxide and methane emissions from a wet-dry tropical floodplain in Northern Australia. Wetlands , 34 (3). pp. 619-627.

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Abstract

In order to better understand how global climate change will affect greenhouse gas dynamics in wetland systems, an accurate quantification of global greenhouse gas emissions from these areas is essential. Despite a large proportion of wetlands occurring in tropical areas, data on greenhouse gas fluxes from these areas is limited. This study aimed to quantify carbon dioxide (CO2) and methane (CH4) fluxes from an undisturbed tropical wetland environment in northern Australia, and to evaluate the influence of different habitat types on net emission rates. Fluxes were measured at seven sites, representing different habitat types during the inundation season of 2012. Highest CO2 fluxes, with a maximum at 199.4 mg CO2-Cm−2 h−1, were measured in open water areas. This likely corresponded to increased mobilisation of sediment organic matter and high water turbulence, as inferred from turbidity measurement. CH4 fluxes, however, were greatest in densely vegetated areas and peaked at 153.2 mg CH4-C m−2 h−1, a possible result of increased transport through plant stems. Carbon dioxide and methane fluxes over the whole wetland averaged 86.0 mg CO2-C m−2 h−1 and 25.3 mg CH4-C m−2 h−1, respectively.

Item ID: 34398
Item Type: Article (Research - C1)
ISSN: 1943-6246
Keywords: carbon dioxide, methane, floodplain, wetland, Tropical Australia
Funders: Australian Research Council (ARC)
Projects and Grants: ARC DP110103364
Date Deposited: 06 Aug 2014 04:15
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology @ 50%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050102 Ecosystem Function @ 50%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 50%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 50%
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