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Transfert d'oxygene et anoxie dans les sols agreges : contribution a l'etude de la denitrification

Abstract : Anaerobiosis was studied in aggregated soils in order to improve the knowledge of physical factors affecting denitrification. A numerical model was used to simulate oxygen transport and anaerobiosis in homogeneous aggregates of various shapes and dimensions, with possible occlusions of some parts of their external surface. These occlusions are due to contacts with neighbouring aggregates and to water menisci around them. It is possible to obtain similar results using an empirical model. By using this model and a model describing oxygen diffusion in the inter-crumb pore space we obtained relationships between anaerobiosis and water content similar to previously proposed empirical relationships between denitrification and water content. The model showed interactions between the effects of water content, temperature and soil structure. Experiments were carried out using gas chromatography and oxygen microelectrodes. Microbial respiration depends on oxygen and carbon dioxide concentrations. Carbon dioxide generally inhibits respiration but may increase it at low level. There is a large variability in global respiration of natural aggregates and oxygen concentration distribution is irregular inside them, as a consequence of the distribution of the pore space and probably the distribution of the organic matter. For aggregates of remoulded soil, it is possible to simulate their global respiration and the oxygen concentration distribution inside, when accounting for carbon dioxide transport and oxygen effect on microbial respiration.
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Pierre Renault, Jorge Sierra, Pierre Stengel. Transfert d'oxygene et anoxie dans les sols agreges : contribution a l'etude de la denitrification. Agronomie, EDP Sciences, 1994, 14 (6), pp.395-409. ⟨10.1051/agro:19940605⟩. ⟨hal-02715943⟩

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