Bioactivity of Soils of Forest Biogeocenoses in Middle Volga Region

to de-termine the the reasons for variability of bioactivity of soils in the forests of Middle Volga region, to reveal the existing interrelations and to reflect them standard applied programs. Results and discussion. The limits and the reasons for variability of intensity of СО 2 emission in laboratory conditions out from forest litter and soil in forest biogeocenoses of Middle Volga region were determined. It was demonstrated that intensity of СО 2 emission de-creased with increase of acidity and with decrease of content of organic matter, which were the food for microorganisms. The corresponding empiric equations are given, the equations may be used for indirect estimate of intensity of СО 2 emission out from soils of forest biogeocenoses. Bioactivity of forest litters and soils strictly declines with depth of profile but it is very high in soft-wooded broadleaved stands. Conclusions. Soil microorganisms is the most informative diagnostic component part of ecosystems, it quickly responds to the influence of all the factors of environ-ment. Thus, it is viable to use the diagnostic component part in the ecological monitoring of man-made impact on ecosystems. Intensity of СО 2 emission of microorganisms out from soil and forest litter mainly depends on their acidity and the content of organic matter, which is described in the regression equations with a very high degree of confidence. To specify and to reveal new regulari-ties, it is important to continue the research and to establish public e-databases.