Process-based modeling of nitrous oxide emissions from wheat-cropped soils at the sub-regional scale

Abstract : Arable soils are a large source of nitrous oxide (N2O) emissions, making up half of the biogenic emissions worldwide. Estimating their source strength requires methods capable of capturing the spatial and temporal variability of \ony~emissions, along with the effects of crop management. Here, we applied a process-based model, CERES, with geo-referenced input data on soils, weather, and land use to map N2O emissions from wheat-cropped soils in three agriculture intensive regions in France. Emissions were mostly controlled by soil type and local climate conditions, and only to a minor extent by the doses of fertilizer nitrogen applied. As a result, the direct emission factors calculated at the regional level were much smaller (ranging from 0.0007 to 0.0033 kg N2O-N kg N) than the value of 0.0125 kg N2O-N kg N currently recommended in the IPCC Tier 1 methodology. Regional emissions were far more sensitive to the soil microbiological parameters governing denitrification and its fraction evolved as N2O, soil bulk density, and soil initial inorganic N content. Mitigation measures should therefore target a reduction in the amount of soil inorganic N upon sowing of winter crops, and a decrease of the soil N2O production potential itself. From a general perspective, taking into account the spatial variability of soils and climate thereby appears necessary to improve the accuracy of national inventories, and to tailor mitigation strategies to regional characteristics.
Type de document :
Article dans une revue
Global Biogeochemical Cycles, American Geophysical Union, 2006, 20, pp.GB4018. 〈10.1029/2006GB002686〉
Liste complète des métadonnées

Littérature citée [30 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-00017134
Contributeur : Benoit Gabrielle <>
Soumis le : vendredi 22 décembre 2006 - 15:26:16
Dernière modification le : vendredi 8 juin 2018 - 14:50:13
Document(s) archivé(s) le : jeudi 23 septembre 2010 - 15:53:10

Fichier

Gabrielle_GBC06_postprint.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Citation

Benoit Gabrielle, Patricia Laville, Odile Duval, Bernard Nicoullaud, Jean-Claude Germon, et al.. Process-based modeling of nitrous oxide emissions from wheat-cropped soils at the sub-regional scale. Global Biogeochemical Cycles, American Geophysical Union, 2006, 20, pp.GB4018. 〈10.1029/2006GB002686〉. 〈hal-00017134v3〉

Partager

Métriques

Consultations de la notice

425

Téléchargements de fichiers

246