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| Titel |
Simulating microbial degradation of organic matter in a simple porous system using the 3-D diffusion-based model MOSAIC |
| VerfasserIn |
O. Monga, P. Garnier, V. Pot, E. Coucheney, N. Nunan, W. Otten, C. Chenu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 8 ; Nr. 11, no. 8 (2014-04-22), S.2201-2209 |
| Datensatznummer |
250117369
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| Publikation (Nr.) |
 copernicus.org/bg-11-2201-2014.pdf |
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| Zusammenfassung |
| This paper deals with the simulation of microbial degradation of organic
matter in soil within the pore space at a microscopic scale. Pore space was
analysed with micro-computed tomography and described using a sphere network
coming from a geometrical modelling algorithm. The biological model was
improved regarding previous work in order to include the transformation of
dissolved organic compounds and diffusion processes. We tested our model
using experimental results of a simple substrate decomposition experiment
(fructose) within a simple medium (sand) in the presence of different
bacterial strains. Separate incubations were carried out in microcosms using
five different bacterial communities at two different water potentials of
−10 and −100 cm of water. We calibrated the biological parameters by
means of experimental data obtained at high water content, and we tested the
model without changing any parameters at low water content. Same as for the
experimental data, our simulation results showed that the decrease in water
content caused a decrease of mineralization rate. The model was able to
simulate the decrease of connectivity between substrate and microorganism due
the decrease of water content. |
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