Abstract：
:Aerobic soils are an important sink for methane (CH4), contributing up to 15% of global CH4 destruction. However, the sink strength is significantly affected by land management, nitrogen (N) fertilizers and acidity. The rates of uptake from the atmosphere of both enhanced (10 ppmv) and ambient (2 ppmv) concentrations of CH4 were measured in laboratory incubations of soil cores under controlled conditions taken from sites in the U.K. and Germany. The most rapid rates of uptake were measured in soil from deciduous woodland at pH 4 (measured in water). Extended (150 years) cultivation of land for arable crops reduced uptake rate by 85% compared to that in the same soil under an adjacent woodland. The long-term application of ammonium (NH4)-based fertilizer, but not nitrate (NO3)-based fertilizer, completely inhibited CH4 uptake, but the application for the same period of farmyard manure (FYM) that contained more N than the fertilizer had no inhibitory effect. Where a combination of FYM and inorganic fertilizer was applied there was a reduction in methane uptake rate compared to plots receiving solely FYM.Autoclaving showed that the uptake of CH4 was microbially mediated. The most likely causes of the inhibitory effects seen are (i) insufficient concentrations of CH4 in situ to activate methane monooxygenase; (ii) the direct inhibition of CH4 oxidation by NH inf4 (sup+) ions; (iii) the suppression of methanotrophs by NH4-based fertilizers; (iv) the requirement of methanotrophs for a stable soil architecture which is incompatible with the disturbance caused by regular arable cultivation.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Goulding KW,Willison TW,Webster CP,Powlson DSdoi
10.1007/BF00394049subject
Has Abstractpub_date
1996-09-01 00:00:00pages
175-87issue
1-2eissn
0167-6369issn
1573-2959journal_volume
42pub_type
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