DEPOSITION OF ORGANIC CARBON IN AGROBIOGEOCENOSES OF THE TEMPERATE ARID STEPPE OF ALTAI

Background. The deposition of organic carbon in biogeocenoses depends on natural conditions. In agrobiocenosis, along with natural conditions, this process is activated by anthropogenic actions in the form of an agricultural system, having studied which can be taken as a basis for the organization of carbon farming. Purpose. The aim of the study is to establish the intensity of the process of deposition of organic carbon by agrobiogeocenoses in the moderately arid steppe of Altai. Materials and methods. The object of research was the soils of the moderately arid Altai steppe, which are a repository of organic carbon. We used archival materials of JSC AltayNIIGiprozem and the results of our own research in 2023. Organic carbon was determined by the Tyurin method, pure primary products according to the method of A.A. Titlyanova, at the same time, production, aboveground and subsurface mortmass were taken into account, which makes it possible to determine the potential arrival of organic matter by agrocenoses. Results. The content of organic carbon in the humus horizon has significantly degraded by 23-32% over 40 years in southern and ordinary agrochernozems, to a lesser extent in leached ones. In the ecosystem, the largest reserves of organic carbon in a twenty-centimeter layer are characterized by biogeocenoses of salt marshes and meadow-marsh soils, followed in decreasing sequence by gray forest, meadow, meadow-chernozem, salt marshes. Agro-soils contain 40-45% less organic carbon than the natural ecosystems of biogeocenoses of salt marshes and meadow-marsh soils. Post-photosynthetic carbon runoff has been determined in the agrocenoses of spring wheat, oilseed flax, and spring rapeseed. At the same time, rapeseed absorbs 4 times more carbon dioxide compared to spring wheat and 58% more than oilseed flax. Conclusion. The results of the research are the initial stage of the organization of carbon farming, allowing you to set the intervals of carbon units.