Potential GHG mitigation and carbon sequestration from European cropland by modelling crop residues management
Résumé
Crop residue management are a key lever to increase soil carbon (SOC) stock but can promote nitrous oxide (N2O) emissions, modifying the greenhouse (GHG) footprint of the agroecosystems. This work aims to estimate SOC balance and N2O emissions from different crop residue managements in the European cropping systems over climate change scenarios. Two ecosystem models (Landscape-DNDC and CERES-EGC) were sued to simulate four residues managements: exported, buried into the soil, left on surface, exported or recycled in function of the crop specie. Results highlights that both models shown similar and representative trends of crop production, SOC and N2O emissions. Climate change scenarios have an overall effect to increase N2O emissions and reduce SOC storage toward 2100 in all the residue management scenarios with the worst effects with the fully exported one. The benefits in terms of GHG balance of the complete buried residues is limited to 2-4 decades from nowadays, since the elevated N2O emissions will offset the carbon sequestration benefits.
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