Modeling of nitric oxide emissions from temperate agricultural ecosystems.Reportar como inadecuado

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1 EGC - Environnement et Grandes Cultures 2 LA - Laboratoire d-aérologie - LA

Abstract : Arable soils are a significant source of nitric oxide NO, most of which is derived from nitrogen fertilizers. Precise estimates of NO emissions from these soils are thus essential to devise strategies to mitigate the impact of agriculture on tropospheric ozone regulation. This paper presents the implementation of a soil NO emissions submodel within the environmentally-orientated soil crop model, CERES-EGC. The submodel simulates the NO production via nitrification pathway, as modulated by soil environmental drivers. The resulting model was tested with data from 4 field experiments on wheat- and maize-cropped soils representative of two agricultural regions of France, and for three years encompassing various climatic conditions. Overall, the model gave correct predictions of NO emissions, but shortcomings arose from an inadequate vertical distribution of fertilizer N in the soil surface. Inclusion of a 2-cm thick topsoil layer in an -micro-layer- version of CERES-EGC gave more realistic simulations of NO emissions and of the under-lying microbiological process. From a statistical point, both versions of the model achieved a similar fit to the experimental data, with respectively a MD and a RMSE ranging from 1.8 to 6.2 g N-NO ha−1 d−1, and from 22.8 to 25.2 g N-NO ha−1 d −1 across the 4 experiments. The cumulative NO losses represented 1 to 2% of NH+4 fertilizer applied for the maize crops, and about 1% for the wheat crops. The -micro-layer- version may be used for spatialized inventories of biogenic NO emissions to point mitigation strategies and to improve air quality prediction in chemistry transport models.

Keywords : NO emissions temperate crops CERES-EGC process modeling goodness of fit

Autor: Marie-Noëlle Rolland - Benoît Gabrielle - Patricia Laville - Dominique Serça - Jérôme Cortinovis - Eric Larmanou - Simon Leh



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