Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Laure Vogel; David Makowski; Patricia Garnier; Vieublé-Gonod Laure; Yves Coquet; Xavier Raynaud; Naoise Nunan; Claire Chenu; Ruth Falconer; Valérie Pot

Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

Laure Vogel ¹ David Makowski ² Patricia Garnier ¹ Vieublé-Gonod Laure ¹ Yves Coquet ³ Xavier Raynaud ⁴ Naoise Nunan ⁵ Claire Chenu ⁵ Ruth Falconer ⁶ Valérie Pot ¹

1 ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

2 Agronomie

3 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327

4 Sorbonne Universités

5 Bioemco - Biogéochimie et écologie des milieux continentaux

6 SIMBIOS - SIMBIOS centre

Abstract : Soil structure and interactions between biotic and abiotic processes are increasingly recognized as important for explaining the large uncertainties in the outputs of macroscopic SOM decomposition models. We present a numerical analysis to assess the role of meso- and macropore topology on the biodegradation of a soluble carbon substrate in variably water saturated and pure diffusion conditions . Our analysis was built as a complete factorial design and used a new 3D pore-scale model, LBioS, that couples a diffusion lattice-Boltzmann model and a compartmental biodegradation model. The scenarios combined contrasted modalities of four factors: meso- and macropore space geometry, water saturation, bacterial distribution and physiology. A global sensitivity analysis of these factors highlighted the role of physical factors in the biodegradation kinetics of our scenarios. Bacteria location explained 28% of the total variance in substrate concentration in all scenarios, while the interactions among location, saturation and geometry explained up to 51% of it.

Keywords : Biodegradation Lattice-Boltzmann method Pore-scale heterogeneity Spatial distribution Substrate diffusion Microbial habitats

Document type :

Journal articles

Domain :

Sciences of the Universe [physics]

Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01170155
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, July 1, 2015 - 10:03:12 AM
Last modification on : Friday, October 4, 2019 - 1:12:15 AM

Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

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Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate

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