Water-physical properties of soils are essential for the abundance of microorganisms in soil, their spatial distribution in the soil profile, and the morphological and taxonomic structure of microbial communities [1-4]. Therefore, the structural analysis of bacterial communities in floodplain soils developed under contrasting water conditions (regular flooding frequently followed by soil desiccation in summer) is of special interest. We previously determined the size and taxonomic composition of bacterial communities in floodplain landscapes based on the analysis of plant and soil samples taken seasonally in the field [5]. To more completely characterize the taxonomic composition of bacterial communities in floodplain soils, it is advisable to use succession analysis, which was successfully applied to the survey of microbial diversity in other soil types [2, 6, 7].
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