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Trees are major conduits for methane egress from tropical forested wetlands

Pangala, Sunitha R.; Moore, Sam; Hornibrook, Edward R. C. and Gauci, Vincent (2013). Trees are major conduits for methane egress from tropical forested wetlands. New Phytologist, 197(2) pp. 524–531.

DOI (Digital Object Identifier) Link: https://doi.org/10.1111/nph.12031
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Abstract

Wetlands are the largest source of methane to the atmosphere, with tropical wetlands comprising the most significant global wetland source component. The stems of some wetlandadapted tree species are known to facilitate egress of methane from anoxic soil, but current ground-based flux chamber methods for determining methane inventories in forested wetlands neglect this emission pathway, and consequently, the contribution of tree-mediated emissions to total ecosystem methane flux remains unknown.

In this study, we quantify in situ methane emissions from tree stems, peatland surfaces (ponded hollows and hummocks) and root-aerating pneumatophores in a tropical forested peatland in Southeast Asia.

We show that tree stems emit substantially more methane than peat surfaces, accounting for 62–87% of total ecosystem methane flux. Tree stem flux strength was controlled by the stem diameter, wood specific density and the amount of methane dissolved in pore water.

Our findings highlight the need to integrate this emission pathway in both field studies and models if wetland methane fluxes are to be characterized accurately in global methane budgets, and the discrepancies that exist between field-based flux inventories and top-down estimates of methane emissions from tropical areas are to be reconciled.

Item Type: Journal Item
Copyright Holders: 2012 The Authors
ISSN: 1469-8137
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetRoyal Society
Keywords: methane (CH4); peatland; plant-mediated emissions; tree-stem fluxes; wetland
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: OpenSpace Research Centre (OSRC)
Item ID: 36042
Depositing User: Vincent Gauci
Date Deposited: 09 Jan 2013 13:44
Last Modified: 10 Apr 2019 10:01
URI: http://oro.open.ac.uk/id/eprint/36042
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