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It is shown that the diagnostics of the stage of woodland soils affected by wildfires and forest cuts can be determined by the evaluation indexes of the range of the scale of abundance of typical ecologic and trophic groups of microorganisms (ECTGM), microbiological activity coefficients, reserve and abundance fluctuations, and metabolism. The degree of impact of the technogenic emissions on the forest cover, soil, and phyllosphere according to ECTGM abundance on the diagnostic environments and their fermentative activ ity is expressed with the help of an advisability functional relation.

The occurrence of ophiostomatoid fungi, associates of xylophagous insects, was established to be an indicator of the state of coniferous plantations under different anthropogenic influences and adverse eco logical conditions at the coenotic level. The sizes of necroses developed on a tree inoculated with blue stain fungus isolates were recorded to be indicators of the state of the tree at the physiological level.

Microbial communities of alluvial soils in the facies on islands in the Selenga estuary and near Stepnoi Dvorets and Istomino Settlements were studied. The distribution of the CFU-dominant microorganisms ( Bacillus and Pseudomonas + Arthrobacter ) has been revealed in the studied island soils. In addition, actinomycetes Streptomyces were found among the dominants in soils of the near-terrace floodplain. The quantitative distribution of microorganisms across soil layers was demonstrated. The effect of ecological factors in formation of microbial communities on the islands and central floodplain regions was revealed.

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