Titre :
|
Fluxes of nitrous oxide from boreal peatlands as affected by peatland type, water table level and nitrification capacity
|
Auteurs :
|
K. Regina ;
H. Nykanen ;
J. Silvola ;
AL Et
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1996
|
Format :
|
p. 401-418
|
Langues:
|
= Anglais
|
Catégories :
|
EAU
|
Mots-clés:
|
TOURBIERE
;
NITRIFICATION
;
DRAINAGE
;
BACTERIE
;
PH
;
RABATTEMENT DE NAPPE
|
Résumé :
|
Peat soils with high nitrogen content are potential sources of nitrous oxide (N2O). Fluxes of nitrous oxide were measured in situ on nine virgin and ten drained peatlands of different hydrology and nutrient status. Numbers of nitrifying bacteria were estimated in different layers of the peat profiles with a most-probable-number technique. Nitrification potentials were determined in soil slurries of pH 4 and 6 from the profiles of six peat soils. Many virgin peatlands showed low N2O uptake. Lowering of the water table generally increased the average fluxes of N2O from the soils, although more in minerotrophic (nutrient rich) than in ombrotrophic (nutrient poor) sites. Ammonium oxidizing bacteria were found on only two sites but nitrite oxidizers were detected in almost all peat profiles. More nitrite oxidizers were found in drained than in virgin pear profiles.
|
Source :
|
Biogeochemistry, vol.35
|