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Methane emission rates from a northern wetland; response to temperature, water table and transport

MacDonald, J. A.; Fowler, D.; Hargreaves, K. J.; Skiba, U.; Leith, I.; Murray, M. B.. 1998 Methane emission rates from a northern wetland; response to temperature, water table and transport. Atmospheric Environment, 32 (19). 3219-3227. 10.1016/S1352-2310(97)00464-0

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Abstract/Summary

Static chamber measurements of CH4 flux were made from a range of micro-environments in an area of blanket bog in Northern Scotland. CH4 flux covered a wide range, the largest rate of CH4 emission, at 175.6 μmol m−2 h−1, was observed in pool areas through the vascular plant Menyanthes trifoliata. Investigations into the response of net CH4 emission rates to temperature and water table were carried out under semi-natural conditions on 45 large peat monoliths, maintained in open-top chambers, over a three-year period. The mean rate of CH4 emission at 10°C was an order of magnitude larger from pool monoliths (surface water table) at 78.0 μmol m−2 h−1, than from hummock monoliths (water table 15 cm below surface) at 8.4 μmol m−2 h−1. Rates of CH4 emission showed a positive linear response to increasing temperature from pool and lawn monoliths with activation energies of 74.3 and 79.5 kJ mol−1 and Q10 values of 3.0 and 3.3, respectively. When conditions of temperature, water table, light and humidity were controlled pool cores showed an exponential increase in CH4 emission rates between 5 and 30°C.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/S1352-2310(97)00464-0
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: _ Biogeochemistry & Ecosystem Function
ISSN: 1352-2310
Additional Keywords: Methanogenesis, vascular, oxidation, peat, stomata
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 08 Sep 2008 15:03
URI: http://nora.nerc.ac.uk/id/eprint/3827

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