TY - JOUR
T1 - Modeling the effect of soil meso- and macropores topology on the biodegradation of a soluble carbon substrate
AU - Vogel, Laure E.
AU - Makowski, David
AU - Garnier, Patricia
AU - Vieublé-Gonod, Laure
AU - Coquet, Yves
AU - Raynaud, Xavier
AU - Nunan, Naoise
AU - Chenu, Claire
AU - Falconer, Ruth E.
AU - Pot, Valérie
PY - 2015/9/1
Y1 - 2015/9/1
N2 - 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.
AB - 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.
U2 - 10.1016/j.advwatres.2015.05.020
DO - 10.1016/j.advwatres.2015.05.020
M3 - Article
VL - 83
SP - 123
EP - 136
JO - Advances in Water Resources
JF - Advances in Water Resources
SN - 0309-1708
ER -