EFFECT OF CLAY MINERALS ON HETROTROPHIC MICROBIAL ACTIVITY IN SOIL

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Abstract
The heterotrophic activity of the soil microbiota (expressed as either CO2 production or O2 consumption) was determined after the addition of various organic substrates (e.g., saccharides, aliphatic and aromatic acids and aldehydes, amino acids; total of 25 compounds) to soils with which 0, 5, 10, or 20 percent montmorillonite or kaolinite or 5 percent mica-vermiculite had been incorporated. With the exception of aldehydes, the decomposition of which was accelerated by the presence of montmorillonite, no clear relationship was observed between the type of organic substrate and the type of clay mineral added. The initial rate and/or the extent of oxidation were either increased, decreased, or not affected by the addition of different clay minerals. In general, the initial rate of decomposition was influenced more by montmorillonite, whereas the extent of oxidation was affected more by kaolinite. The heterotrophic activity of the soil microbiota (expressed as either CO2 production or O2 consumption) was determined after the addition of various organic substrates (e.g., saccharides, aliphatic and aromatic acids and aldehydes, amino acids; total of 25 compounds) to soils with which 0, 5, 10, or 20 percent montmorillonite or kaolinite or 5 percent mica-vermiculite had been incorporated. With the exception of aldehydes, the decomposition of which was accelerated by the presence of montmorillonite, no clear relationship was observed between the type of organic substrate and the type of clay mineral added. The initial rate and/or the extent of oxidation were either increased, decreased, or not affected by the addition of different clay minerals. In general, the initial rate of decomposition was influenced more by montmorillonite, whereas the extent of oxidation was affected more by kaolinite. © Williams & Wilkins 1974. All Rights Reserved.

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