|
Titre :
|
Nitrous oxide emissions from grazed grassland
|
|
Auteurs :
|
O. Oenema ;
G. Velthof ;
S. Yamulki ;
S. Jarvis
|
|
Type de document :
|
article/chapitre/communication
|
|
Année de publication :
|
1997
|
|
Format :
|
p. 288-295
|
|
Langues :
|
= Anglais
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Catégories :
|
Environnement
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Mots-clés :
|
PRAIRIE
;
PATURAGE
;
DEJECTIONS ANIMALES
;
COMPACTAGE DU SOL
|
|
Résumé :
|
Grazing animals on managed pastures and rangelands have been identified recently as significant contributors to the global N2O budget. This paper summarizes relevant literature data on N2O emissions from dung, urine and grazed grassland, and provides an estimate of the contribution of grazing animals to the global N2O budget.The effects of grazing animals on N2O emission are brought about by the concentration of herbage N in urine and dung patches, and by the compaction of the soil due to treading and trampling. The limited amount of experimental data indicates that 0.1 to 0.7% of the N in dung and 0.1 to 3.8% of the N in urine is emitted to the atmosphere as N2O. There are no pertinent data about the effects of compaction by treading cattle on N2O emission vet Integral effects of grazing animals have been obtained by comparing grazed pastures with mown-only grassland. Grazing derived emissions, expressed as per cent of the amount of N excreted by grazing animals in dung and urine, range from 0.2 to 9.9%, with an overall mean of 2%.
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|
Source :
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Soil Use and Management, vol.13
|
