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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

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Welcome to ECOSYS

UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

Prise en compte des bilans des émissions de carbone, d’azote et de gaz à effets de serre dans l’évaluation de la durabilité d’un système de culture

Fait marquant 2010 de l'UMR EGC

B. Loubet - 2010

La quantification des principaux flux de carbone, d‟azote et de GES a été réalisée pendant quatre ans sur une succession de culture maïs, blé, orge, moutarde. Les bilans des émissions ainsi élaborées permettent de contribuer à l‟évaluation multi-critères des agroécosystèmes. Ainsi, le système de culture étudié perd une quantité importante de carbone -1.3 t C ha-1 an-1. Le bilan d‟azote est lui aussi négatif, -24 kg N ha-1 an-1, et dominé (imports et exports exclus) par le lessivage de nitrates et la volatilisation d‟ammoniac après apport de lisier. Ce travail remet en question la durabilité d‟un tel système de culture et montre la nécessité de dispositifs au champ permettant l‟acquisition de données sur les flux sur le moyen voire le long terme.

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