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Soil environmental variables affecting the flux of methane from a range of forest, moorland and agricultural soils

MacDonald, Jannette A.; Skiba, Ute; Sheppard, Lucy J.; Hargreaves, Kenneth A.; Smith, Keith A.; Fowler, David. 1996 Soil environmental variables affecting the flux of methane from a range of forest, moorland and agricultural soils. Biogeochemistry, 34 (3). 113-132. 10.1007/BF00000898

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Abstract/Summary

Measurements of the net methane exchange over a range of forest, moorland, and agricultural soils in Scotland were made during the period April to June 1994 and 1995. Fluxes of CH4 ranged from oxidation –12.3 to an emission of 6.8 ng m–2 s–1. The balance between CH4 oxidation and emission depended on the physical conditions of the soil, primarily soil moisture. The largest oxidation rates were found in the mineral forest soils, and CH4 emission was observed in several peat soils. The smallest oxidation rate was observed in an agricultural soil. The relationship between CH4 flux and soil moisture observed in peats (FluxCH 4 = 0.023 × %H2O (dry weight) – 7.44, p > 0.05) was such that CH4 oxidation was observed at soil moistures less than 325%( ± 80%). CH4 emission was found at soil moistures exceeding this value. A large range of CH4 oxidation rates were observed over a small soil moisture range in the mineral soils. CH4 oxidation in mineral soils was negatively correlated with soil bulk density (FluxCH 4 = –37.35 × bulk density (g cm–3) + 48.83, p > 0.05). Increased nitrogen loading of the soil due to N fixation, atmospheric deposition of N, and fertilisation, were consistently associated with decreases in the soil sink for CH4, typically in the range 50 to 80%, on a range of soil types and land uses.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/BF00000898
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry
CEH Sections: _ Pre-2000 sections
ISSN: 0168-2563
Additional Keywords: methane oxidation, methane emission, soil, nitrogen
NORA Subject Terms: Agriculture and Soil Science
Ecology and Environment
Atmospheric Sciences
Date made live: 27 Jul 2009 08:41
URI: http://nora.nerc.ac.uk/id/eprint/5865

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