Titre :
|
Measuring the contributions of nitrification and denitrification to the flux of nitrous oxide from soil
|
Auteurs :
|
R. Stevens ;
R. Laughlin ;
L. Burns
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1997
|
Format :
|
p. 139-151
|
Langues:
|
= Anglais
|
Catégories :
|
DECHETS
|
Mots-clés:
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NITRIFICATION
;
DENITRIFICATION
;
SOL
;
MESURE
|
Résumé :
|
The flux of N2O from soil can be due to nitrification or denitrification. Since aerobic and anaerobic microsites can develop within the same soil aggregate, nitrification and denitrification could be occurring at the same time. The contribution of nitrification and denitrification to the flux of N2O can be studied by differentially N-15-labelling the NO3- and NH4+ pools in soils. By periodically measuring and comparing the enrichments of the N2O, NH4+ and NO3- pools, the relative importance of the two processes can be quantified. The conclusions are based on calculations which assume that the N-15 atom fractions of the nitrification and denitrification pools remain uniform throughout the incubation. The initial uniformity of the denitrification pool was tested by adding a nitrification-inhibitor, C2H2, at time zero and examining the N-15-distribution of the accumulated N2O at subsequent times. If the N-15 distribution in the N2O is random it originated from one source, but if the N-15 distribution is non-random the N2O originated from two or more sources.
|
Source :
|
Soil Biology & Biochemistry, vol.29, n°2
|