Abstract
We study the magnetic properties of virgin forest-steppe soils which formed on original vertical uniform unconsolidated parent material. In this work, profile samples of virgin dark-gray forest light loamy soil developed on a Permian (Kazanian stage) siltstone and virgin leached medium-thick fat light-loam chernozem developed on the Quaternary deluvial loam were used. Both soils are characterized by accumulative type of magnetic susceptibility and its components. The accumulative type refers to a profile where the maximum accumulation of substances takes place at the surface with a gradual fall in their content with depth. The calculation of frequency-dependent magnetic susceptibility (F-factor) shows that in studied soils F-factor reflect changes in their ferromagnetic fraction. In the humus part of the soil profile magnetic materials are present predominantly as fine mineral particles, and their content in the <2.5 µm fraction decreases toward the soil-forming rock. Estimates of relative contributions of dia -/paramagnetic, superparamagnetic, and ferromagnetic components obtained from the coercive spectra shows that the increase in the magnetic susceptibility in organogenic horizons of forest-steppe soils is due to the contribution of the ferromagnetic component.
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