Comparative study of the magnetic susceptibility of two subtypes of Siberian chernozems was carried out, depending on the characteristics of their geographical distribution, the formation of properties and composition. A total of 12 soil sections of these soils were studied, nine of which are represented by ordinary chernozems, and three by leached long-term frozen and permafrost chernozems of Western, Middle and Eastern Siberia. The volumetric magnetic susceptibility (χ) of the studied chernozems was determined using a specially developed and patented, accurate, express and reliable method using a small-sized KM-7 cappameter from the Czech manufacturer StatisGeo. Specific magnetic susceptibility (χ) was calculated using the formula: χ = χ/р, where р is soil density, kg/m³. It is shown that the studied chernozems of Siberia are formed in contrasting landscape-climatic conditions of soil formation and lithogenic composition of soil-forming rocks, which leads to significant differences in their magnetic susceptibility, manifested both at the subtype level and at the level of individual pedons. Close positive correlations have been established between the specific magnetic susceptibility of these chernozems and the content of humus, coarse and medium fractions, as well as fine sand, negative ones for pHн₂₀, the amount of easily soluble salts and CaCO₃. If the ordinary freezing chernozems of the European territory of Russia are characterized by a typically accumulative type of magnetic profile, then the long-freezing and permafrost soils of Siberia are characterized by a regressive-accumulative type. At the same time, ordinary frozen chernozems differ from long-term frozen soils by large statistically significant values of specific magnetic susceptibility, which, in our opinion, is associated with the processes of cryogenic ferruginization.
A.P. Chevychelov (Wed,) studied this question.