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Modélisation de la dégradation bactérienne de solutés organiques dans les sols : impact couplé des traits biologiques bactériens, des répartitions spatiales et des processus de transport

Abstract : Soils contribute to ensuring a large part of basic human needs. To better preserve them, we need to better understand them. Organic carbon is one of the key elements of their functioning, but the processes that govern its degradation at the microbial scale are still difficult to elucidate, in part because of the considerable spatial complexity of soil. The objective of this PhD thesis was to understand how the transport processes and spatial distributions of bacteria and soluble carbon influenced the degradation of the latter by bacteria. The confrontation of numerical experiments and observations showed that this question could not be answered without knowing the biological traits of bacteria. Depending on the efficiency of bacteria to consume carbon, their activity can be limited rather by the dilution of carbon or by the competition for carbon even within the same population. The generalization of these results suggests that competition between bacteria plays a widespread and significant role in soils, and highlights an unexpected activity of "poor" soil zones. More generally, the results suggest a theoretical relationship between carbon mobility, bacterial mobility, their optimal location in soil and their carbon consumption efficiency.
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https://theses.hal.science/tel-03617715
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Submitted on : Wednesday, March 23, 2022 - 4:21:08 PM
Last modification on : Thursday, June 2, 2022 - 2:48:17 PM
Long-term archiving on: : Friday, June 24, 2022 - 7:45:40 PM

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  • HAL Id : tel-03617715, version 1

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Alexandre Coche. Modélisation de la dégradation bactérienne de solutés organiques dans les sols : impact couplé des traits biologiques bactériens, des répartitions spatiales et des processus de transport. Sciences de la Terre. Université Rennes 1, 2021. Français. ⟨NNT : 2021REN1B019⟩. ⟨tel-03617715⟩

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