Prise en compte du rôle de la diversité microbienne dans la simulation de la dynamique de la matière organique du sol (MOS) dans un contexte de transition vers l'agro-écologie

Abstract : This thesis suggests and assesses a way to integrate microbial diversity in an operational mechanistic model of C dynamic. From a classical model where mineralisation fluxes are described by 1st order kinetics, we propose functions depending on microbial diversity indices to modulate the parameters of these kinetics. We used 2 datasets containing measures of microbial diversity and C mineralisation kinetics from controlled conditions incubations during 80 days, with and without 13C labelled wheat straw, from grassland and cropland soil samples.In a first step, based on statistical generalizes additive models (GAM), we identified the microbial diversity indices relevant to explain C dynamic. Observed relations allowed us to submit modulation functions depending on microbial diversity to adjust model parameters. The whole has been calibrated through bayesian inference.Overall, the modulation function depending on bacterial diversity led to an improvement of SOM mineralisation fluxes predictions, while fungal based modulation functions led to no improvement.To conclude, the proposed method to integrate microbial diversity was a relevant approach towards a parsimonious representation of microbial diversity influence on C dynamic in generic model. It forms a complementary methodological framework to the dominant explicit and detailed way of microbial diversity representation in C dynamic models.
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Benjamin Louis. Prise en compte du rôle de la diversité microbienne dans la simulation de la dynamique de la matière organique du sol (MOS) dans un contexte de transition vers l'agro-écologie. Agronomie. Agrocampus Ouest, 2016. Français. ⟨NNT : 2016NSARC126⟩. ⟨tel-01538388⟩

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