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Influence de l'hétérogénéité physique des microenvironnements du sol sur les transformations microbiennes du carbone : exploration à l'aide d'un modèle de Boltzmann sur réseau

Abstract : Heterotrophic microorganisms control soil organic matter (SOM) decomposition and may thus have a key importance in climate regulation. Heterogeneous abiotic conditions in soil microenvironments are thought to affect soil decomposers activity by controlling nutrient accessibility through solute transport (diffusion, advection) and sorption processes. Microhabitat – or pore – scale thus appears relevant to study biodegradation processes, but is also challenging to investigate by experimental means.A discrete model was created to explore the effect of abiotic conditions in soil microenvironments on biodegradation kinetics. It results from the coupling of a zero-dimensional soil carbon model and a lattice Boltzmann model (TRT-LBM [Ginzburg, 2005]). It simulates diffusion and biodegradation at the pore scale, as affected by explicitly described structural factors, such as the 3D pore architecture (approximated by discrete images), water distribution under unsaturated conditions and the spatial arrangement of substrates and decomposers – viewed here as immobile bacteria. The model was tested in a range of scenarios depicting contrasted abiotic conditions. The variability in biodegradation kinetics was analyzed to infer the contributions of physical factors. This source of variability was compared to uncertainties associated to biological metabolism description. Finally, experiments manipulating structural factors were performed to confront observed and simulated trends.
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Laure Vogel. Influence de l'hétérogénéité physique des microenvironnements du sol sur les transformations microbiennes du carbone : exploration à l'aide d'un modèle de Boltzmann sur réseau. Sciences agricoles. AgroParisTech, 2015. Français. ⟨NNT : 2015AGPT0061⟩. ⟨tel-03117468⟩

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