Abstract
The role of iron-manganese concretions (IMC) in the processes of accumulation and migration of macro- and microelements in automorphic loamy soils of the southern tundra is estimated. The features of the profile distribution and properties of IMC in the natural tundra soil (Dystric Cambisols) and meadow cultivated soil (Epistagniс Gelic Cambisols) are identified. Differences in the composition of IMC properties of the studied soils are observed both in the upper part of the profile disturbed under anthropogenic impact, and in the lower part preserved the structural features of natural soil. In tundra soils an active redistribution and accumulation of Pb, Cd, Co, As, Mn, and Fe in IMC are specified. Agricultural reclamation of tundra soils makes to the activation of the concretion formation processes. In the cultivated soils, the total amount of IMC increases and a more expressive migration of Fe, Mn, Co down the soil profile and their adsorption in concretion bodies from lower horizons are observed. A decrease in the As content in the IMC of the cultivated tundra soils as compared to natural tundra soils are revealed. This is possible with the high biophilicity of As and its removal from the soil system with the biomass harvest.
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