The project aims to identify the patterns of carbon and nitrogen accumulation in organic components of technogenic ecosystem substrate. For this purpose the properties of embriozems formed at the ash dumps of the Ural region under communities with dominance of arbusculararic (AM) and ectomycorrhizal (EM) plant species will be studied for the first time. Quantitative differences between the ratio of C and N in the roots of dominant plant species, in plant litter and in the humus substance of embriozems, and also in the background soils will be analyzed. The work will include two parts: field and experimental. A conjugate study of communities will be conducted with the dominance of AM and EM plant species and embriozemes on the ash dumps of Verkhniy Tagil and Sredneuralsk electric power stations, as well as in zonal communities. Experimental work will be aimed at identifying chemical composition specifics of the roots of AM and EM plant species and its effect on the rate of root decomposition and the C/N ratio in the newly formed organic components of embriozems. The reasons for the choice of objects and the research program are justified by the fact that carbon and nitrogen are biogenic elements that provide plants and processes of soil organic component transformation with energy and matter. Plant and humus substances are chosen among the organic components, since they provide a nutrient regime, productivity and sustainability of ecosystem functioning. Embriozems of ash dumps located in common bioclimatic boundaries on the same relief elements will allow studying the process of interrelation of carbon and nitrogen accumulation in organic components of ecosystems from zero point, since ash dumps do not contain either C or N and are an excellent substratum for model experiments on the influence of thin roots with different types of mycorrhizas on the composition of plant and humus substances, which ensure the productivity of ecosystems. The project will be implemented on the basis of morphological, microscopic and chemical analysis of dominant plant mycorhizas, as well as methods and approaches of ecology, geobotany and soil science, which is an innovative approach in the study of carbon and nitrogen accumulation. The results will allow us to predict the rate of ecosystem restoration and to propose methods for their acceleration on man-made substrates.