Transformation of properties of podzolic soils under development and cultivation in the middle taiga subzone (Komi Republic)

The results of long-term stationary studies on the properties of loamy soils under forest and plowland in the middle taiga subzone were summarized. Spatial and temporal changes in the morphology and physicochemical properties of agrosoddy-podzolic soils as compared to forest ones, the peculiar pedogenesis of the soils in automorphic positions and on the slopes, and the activation of gleying in these soils were discovered. The downward displacement of the eluvial horizon, the shift to a heavier texture of the arable layer due to the soil cultivation, the variation in the content of clay and silty particles in this layer depending on the duration and stability of the freezing periods, and the decrease in the removal of clay and most oxides in the developed soils were revealed. The removal of iron, aluminum, calcium, and magnesium oxides and the profile distribution of clay indicate the intensification of eluviation in the soils of mesodepressions. The long-term use of podzolic soils in agrocenoses resulted in the leveling of the humus reserves in the entire catena.