ECOLOGICAL CHARACTERISTICS OF URBAN SOILS IN THE ANGARA REGION
An analysis is made of experimental data from studying the ecologo-microbiological and biochemical characteristics of urban soil cover in the Angara region. The study revealed a transformation of the acid/alkaline conditions of soils toward the alkaline side as well as a wide range of biological activity level as the indicator of self-purification capacity of urban soils. On the whole, the urban areas show a moderate activity of soils. A decrease in activity was revealed in the city of Sayansk, one of the principal national centers of chemical industry, as well as on the territories of critical facilities (industrial zones, gas-filling stations, and traffic lights).The structure of microorganisms in urban conditions changes toward an increase in the contribution from bacteria that have adapted themselves to the new conditions. The sanitary state of the cities considered refers to the category of moderate and heavy pollution.