Evaluation de scénarios de gestion paysagère de l’azote par modélisation en bassins versants agricoles

Abstract : Environmental issues related to the excess of reactive nitrogen of agricultural origin activity, are still a major concern in France despite restrictive regulations. To reconcile sustained agricultural production and reduced nitrogen emissions, we identified innovative mitigation strategies and simulated their effects were simulated using distributed agro-hydrological models. The approach consisted in farm surveys in two contrasted situations (NW and SW of France) a basis to simulate the following scenarios :i) optimisation of agricultural practices according to the 5th action programme of the Nitrate Directive ii) conversion of agricultural land into environmental zones (unmanaged grasslands), with varying extension and in different landscape positons. Results show the interest of locating them in an interception position (i.e. in humid zones around the stream network) rather than in headwater position, especially in the NW catchment were subsurface flow is the dominant pathway. This solution would reduce nitrate losses without increasing other nitrogen emissions.
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Laurène Casal. Evaluation de scénarios de gestion paysagère de l’azote par modélisation en bassins versants agricoles. Sciences de la Terre. Agrocampus Ouest, 2018. Français. ⟨NNT : 2018NSARD085⟩. ⟨tel-02178704⟩

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