Demyanyuk O. Ecological bases of functioning microbiocenoses in soils of agroecosystems in conditions of climate change

The results of research of ecological peculiarities of soil microbiocenosis functioning of agroecosystems and their natural analogues are presented in the dissertation work and the dependence of the state and activity of microbial groups from the complex of agroecological factors (edafic, climatic and anthropogenic) was established. It was established that the application of agro-measures and the effect of hydrothermal factors leads to significant changes in the quantitative composition of microorganisms, the restructuring of the taxonomic and functional structure of microbial cenosis, and the course of basic biochemical processes in the soil. It was proved that changes in the content of microbial biomass in the soil are related to the trophic regime and hydrothermal factors (r = 0.66 0.79). According to the carbon dioxide emission index, the ecological stability of different types of soils was determined and ranked by their ability to withstand changes due to the agroecological factors. It was established that in the soil of agroecosystems, the CO2 emission level is high enough and has a significant variability of indicators. Theoretical substantiation and experimental confirmation of the informativity and objectivity of the minimum system of biological indicators for assessing the ecological state of the soil, which takes into account the general content of biomass of microorganisms and orientation of the basic microbiological processes in the soil based on the coefficients of mineralization immobilization, oligotrophy, pedotrophy and humus-accumulation were given. The method of ecological examination of technologies of cultivating agricultural crops in the part of estimation of agrotechnical measures on the indicators of soil biological activity was improved, the approximate scale and the gradation of their changes for the assessment of the ecological state of the soil were proposed. The model of agroecosystem performance on the example of winter wheat depending on the level of biological activity of the soil and hydrothermal factors was developed.