|
Titre :
|
Methane fluxes in aerobic soils
|
|
Auteurs :
|
K. Goulding ;
T. Willison ;
C. Webster ;
D. Powlson
|
|
Type de document :
|
article/chapitre/communication
|
|
Année de publication :
|
1996
|
|
Format :
|
p. 175-187
|
|
Langues:
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= Anglais
|
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Catégories :
|
Environnement
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Mots-clés:
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SOL
;
FERTILISATION
;
UTILISATION DU SOL
;
OXYDATION
;
METHANE
;
FORET
;
ANAEROBIOSE
|
|
Résumé :
|
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.
|
|
Source :
|
Environmental monitoring and assessment, vol.42
|
