Taxonomic structure of prokaryotic communities in soils of different bioclimatic zones

Using high-throughput sequencing, we performed a full-profile analysis of the taxonomic structure and diversity of prokaryotic communities of zonal soil series: sod-podzolic, dark gray, typical chernozem, brown soil, meadow-chestnut soil and solonets. Phyla Acidobacteria, Actinobacteria, Bacteroidetes, Chloroflexi, Firmicutes, Gemmatimonadetes, Planctomycetes, Proteobacteria and Verrucomicrobia formed up to 95% of prokaryotic communities in all studied soil horizons. Phyla Proteobacteria and Actinobacteria and archaeal phylum Thaumarchaeota dominated in all soils. We revealed the trends of changes in the representation of bacterial phyla in the soils of the zonal range from taiga to dry-steppe: a decrease of Acidobacteria and an increase of Actinobacteria in the upper horizons. The diversity indices of the prokaryotic communities of different genetic horizons of the studied soils were evaluated. In all soils, a decrease in diversity indices with the depth of the horizon was revealed...