Methane production and consumption in temperate and subarctic peat soils: response to temperature and pH
1993
Dunfield, P. | Knowles, R. | Dumont, R. | Moore, T.R.
Rates of methane (CH4) production under anaerobic conditions and CH4 consumption under aerobic conditions were studied in slurries of peat samples kept at different temperatures (0-35 degrees C) and pH values (buffered at pH 3.5-8). Apparent Km CH4 for consumption was 1 micrometer. Optimum temperatures for both processes were about 25 degrees C but CH4 production showed much more temperature-dependence (activation energies 123-271 kJ mol-1, Q10 values 5.3-16) than did CH4 consumption (activation energies 20-80 kJ mol-1 values 1.4-2.1). In the 0-10 degrees C range, CH4 production was negligible but CH4 consumption was 13-38% of maximum. Both processes showed optimum pH values which were about 2 pH units higher than the native peat pH in acidic peats and only 0-1 pH unit higher in the more alkaline peats. We conclude that the microflora involved in CH4 metabolism is not well adapted to either low temperatures or low pH values.
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