Reducing greenhouse gas emissions requires not only the sequestration of organic carbon in the soil but also its stabilization. The main mechanism for stabilizing organic carbon in the soil involves the formation of organo-mineral compounds with a high degree of stability and its localization in micro- and macroaggregates hydrostable. The decisive role in the stabilization of humic substances belongs to the clay minerals concentrated in the fractions of fine clay (<0.001 mm) and fine dust (0.005-0.001 mm). Practically all the hydromic (illite) and smectite-montmorillonite reserves characteristic of chernozems are concentrated within them. Given that both the content of particle size fractions and the content of clay minerals differ from soil to soil and vary depending on the landscape conditions, especially the origin and composition of the parent rock, the soil's humus accumulation potential is different from soil to soil. In this sense, to evaluate the humus accumulation potential, the Humus Accumulation Potential (PAH) is used, which is calculated based on the parameters of the granulometric composition of soils (Гуркова, Соколов, 2022 ). According to the authors cita and PAH represent the maximum amount of humus accumulated by the physical clay fraction (< 0.01 mm) in optimal conditions for carrying out the humification process. According to our calculations, more than 90% of the total content of organic matter in the chernozems and chernozimoid soils from the space between the Prut and Dniester forms compounds with the mineral component of the soil, this being concentrated, predominantly, in the fractions < 0.005 mm. The fraction of fine dust (0.005-0.001 mm) is characterized by maximum humus content. In the fine clay fraction (< 0.001 mm) the humus content is relatively lower. In the particle fractions > 0.005 mm, the humus content is < 0.5-1% in the medium dust fraction (0.01-0.005 mm) and < 0.3 – 0.5% in the coarse dust fraction (0.05 0.01 mm). In this sense, the lithogenic potential of humus accumulation is determined by the total content of physical clay (< 0.01 mm), the content and ratio between the particle size fractions that make up the physical clay fraction, the mineralogical composition of the fine dust and fine clay fractions. According to our calculations, the role of the fine dust fraction and the fine clay fraction in the physical clay constitution is approximately equal in soils with clayey granulometric composition. In soils with loamy clay and clay loam granulometric composition, the decisive role in the accumulation of humus belongs to the fine clay fraction, whose weight in loamy soils is 52-54%. The weight of the medium dust fraction (0.05-0.001 mm) in humus accumulation is reduced from 10-22% in loamy soils to 912% in loamy soils and 5-8% in clayey soils. In the context of the mentioned, our research has shown that PAH increases from carbonate and typical poorly humic chernozems to typical moderately humic and leached ones. In the same sense, the Valorification Index (I.V.) of the humus accumulation potential also increases. Its values, however, vary significantly, depending on the category of agricultural land use, the degree of erosion, geomorphological conditions, etc. Within smooth spaces, wind erosion plays an important role in the formation of PAH and IV.