Results of soil microbiological monitoring of virgin forests and transformed ecosystems are analyzed and generalized. It is shown, that the number of main ecological-trophic groups of soil microorganisms varies with the height of forest massive and level of anthropogenic load. The level of biological activity of all studied transformed ecosystems was the lowest in the soil of territories directly adjacent to the railroad and highway. The maximum value of soil biological activity was fixed in virgin forest ecosystems. The level of phytotoxical activity of soil in the transformed ecosystems was three times higher, than in the virgin forests. Phytotoxicity of soil is the informative indicator: it can be used for soil monitoring studies to evaluate anthropogenic impact on ecosystems.
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