Titre :
|
Prediction of nitrous oxide fluxes from managed grassland on peat soil using a simple empirical model
|
Auteurs :
|
G. Velthof ;
J. Koops ;
J. Duyzer ;
O. Oenema
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1996
|
Format :
|
p. 339-356
|
Langues:
|
= Anglais
|
Catégories :
|
DECHETS
|
Mots-clés:
|
DENITRIFICATION
;
MODELE
;
PRAIRIE
;
TOURBE
;
MESURE
;
EXPERIMENTATION
|
Résumé :
|
Three measurement campaigns were carried out to answer questions related to the factors controlling variations in nitrous oxide (N2O) fluxes from intensively managed grassland on peat soil, comparison of flux measurements with a closed flux chamber method and a flux gradient technique and the development and testing of a simple empirical model for the estimation of N2O fluxes from intensively managed grassland on peat soils. Fluxes of N2O were measured with 42-48 flux chambers and ranged from less than 0.01 to 6.66 mg N m(-2) hr(-1). Fluxes were significantly correlated with denitrification activity (R2 = 0.34-0.56). Contents of nitrate (NO3-) and ammonium (NH4+) in the top soil and the water-filled pore space (WFPS) explained 37-77% of the variance in N2O flux. Spatial variability of N2O fluxes was large with coefficients of variation ranging from 101 to 320%. Spatial variability was suggested to be related to distribution of mineral N fertilizer and cattle slurry, urine and dung patches and variations in groundwater level within the field.
|
Source :
|
Netherlands Journal of Agricultural Science, vol.44
|