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Le contrôle des émissions de N2O par l’état structural des sols

Abstract : Agricultural soils account for 66 % of anthropogenic nitrous oxide emissions (N2O), the 3rd greenhouse gas emitted from anthropogenic activities. N2O emissions variability measured in-situ is quite high. Soil structure affects both N2O production processes and N2O movements through the soil profile. The main goal of this work was to understand the part of soil structure in soil N2O spatial variability. Two kinds of laboratory experiments were designed: rainfall experiments on soil trays of 0.3 m² x 0.1 m and on a 10 m² x 0.3 m box with a slope. A modelling approach with a short time step was combined, involving representation of physical, chemical and biological soil processes as well as a representation of surface runoff. This work highlighted a hierarchy between N2O production and N2O transportation processes, which evolve with time and environmental conditions: under conditions that favor denitrification, N2O production increases with soil bulk density due to an increase in the water-filled pore space, until a threshold limit. The deterministic modelling approach showed that rainfall dynamic and resulting runoff affect soil N2O emissions, those emissions occurring later downslope. Finally, this work highlighted the complexity of soil N2O emissions determinism and we pointed out that the description of soil structure at a high spatial resolution would be useful to improve modelling quality.
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  • HAL Id : tel-02790797, version 1
  • PRODINRA : 474578

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Flavien Poincot. Le contrôle des émissions de N2O par l’état structural des sols. Sciences de la Terre. Université d'Orléans, 2019. Français. ⟨tel-02790797⟩

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