Inna Stepanovna Zhebrak

The paper presents a comparative analysis of the structural and functional characteristics of the microbial communities of the gray forest soil of fallow and intensively cultivated areas. Long-term anthropogenic impact with massive annual mineral fertilization when growing a monoculture of potatoes has led to the degradation of the soil microbial system. A catastrophic decrease in the functional potential of the microbial system (environmental services) is shown using eco-exergy as a thermodynamic indicator of the “health” of the soil.

The characteristic of symbiotic relationships is presented on the example of vesicular-arbuscular mycorrhiza in the case of Trifolium pratenseL. at different succession stages of meadow phytocenoses. It is shown that the functional potential of symbiosis changes in the course of succession and is fully revealed under conditions of an undisturbed climax community. The fundamental possibility of biological diagnostics of the state of phytocenosis using discriminant analysis according to the indices of an individual legume plant, taking into account the symbiotic potential, has been demonstrated.