Distribution of sulfate-reducing bacteria in paddy-field soil

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Abstract
The distribution of sulfate-reducing bacteria in a paddy-field soil was investigated by enumerating the viable number of the bacteria in minute loci. A small area having 20 mm or 40 mm square was divided into 100 sections; a small amount of soil was sampled form each section and the bacterial number was estimated by the anaerobic agar plate method. The distribution patterns of the bacteria were represented by distribution maps. The numbers of the bacteria in the sections showed distinct variations among the sections. The sections having large bacterial numbers showed high concentrations in some parts of an area. The aggregated distribution pattern was common in the soil, whether it was under drained or waterlogged condition, and indicates that there seem to be some centers of multiplication of sulfate-reducing bacteria in paddy-field soil.

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