Abstract
The contents, distribution in the profile, and migration capacity of 238U in automorphic podburs (Entic Podzols) and hydromorphic alluvial (Fluvisols) soils of natural and human-transformed landscapes of southern Yakutia are analyzed. Human-transformed (technogenic) landscapes of southern Yakutia, including the Elkon uranium deposit area, in particular, are characterized by two distinct types of element migration in soils: the aero-technogenic and the hydro-technogenic migration. These types of element migration determine the level of 238U pollution of soils, the distribution pattern of 238U in the soil profiles, and the proportion between 238U compounds with different migration capacity. The soils subjected to the radioactive contamination are characterized by the increased mobility and migration capacity of 238U isotopes in comparison with the unpolluted soils of natural landscapes. Also, in contrast to automorphic podburs, hydromorphic alluvial soils are characterized by the increased level of radioactive pollution and higher concentrations of mobile uranium compounds.
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