Pangala, Sunitha R.; Gowing, David J.; Hornibrook, Edward R. C. and Gauci, Vincent
(2014).
| DOI (Digital Object Identifier) Link: | https://doi.org/10.1111/nph.12561 |
|---|---|
| Google Scholar: | Look up in Google Scholar |
Abstract
Recent studies have confirmed significant tree-mediated methane emissions in wetlands; however, conditions and processes controlling such emissions are unclear. Here we identify factors that control the emission of methane from
Alnus glutinosa.
Methane fluxes from the soil surface, tree stem surfaces, leaf surfaces and whole meso-cosms, pore water methane concentrations and physiological factors (assimilation rate, stomatal conductance and transpiration) were measured from 4-yr old A. glutinosa trees grown under two artificially controlled water-table positions.
Up to 64% of methane emitted from the high water-table mesocosms was transported to the atmosphere through
A. glutinosa. Stem emissions from 2 to 22 cm above the soil surface accounted for up to 42% of total tree-mediated methane emissions. Methane emissions were not detected from leaves and no relationship existed between leaf surface area and rates of tree-mediated methane emissions. Tree stem methane flux strength was controlled by the amount of methane dissolved in pore water and the density of stem lenticels.
Our data show that stem surfaces dominate methane egress from A. glutinosa, suggesting that leaf area index is not a suitable approach for scaling tree-mediated methane emissions from all types of forested wetland.
| Item Type: | Journal Item |
|---|---|
| Copyright Holders: | 2013 The Authors |
| ISSN: | 1469-8137 |
| Keywords: | Alnus glutinosa; lenticels; methane (CH4); stem CH4 emissions; tree-mediated methane emissions; 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: | International Development & Inclusive Innovation OpenSpace Research Centre (OSRC) |
| Item ID: | 39884 |
| Depositing User: | Vincent Gauci |
| Date Deposited: | 10 Apr 2014 12:57 |
| Last Modified: | 30 May 2019 13:18 |
| URI: | http://oro.open.ac.uk/id/eprint/39884 |
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