[Geochemical mapping of the Dnieper river valley]
2005
Ryabova, L.N. | Veremchuk, S.N.(The National Academy of Sciences, Minsk (Belarus). Institute of Geochemistry and Geophysics)
An ecological and geochemical map of the Dnieper river valley of the scale 1:25,000 was made and a detailed explication was prepared where topographic features, soil and vegetative cover types, natural moisture conditions, grounwater level, soil and rock granulometric composition humus horizon thickness, organic matter content medium pH` were specified for each of the distinquished geochemical landscapes. Geochemical barriers and associations of concentrating elements were revealed for each type of the landscapes. A fragment of the map representing Rogachev district of Gomel region is demonstrated as an example. A quantitative assessment of the ecological conditions of landscapes was based on the summary contamination index. The content of elements-contaminants in humus horizons of the soils from the Dnieper river valley upstream from the town of Rogachev were taken as background concentrations for this site of valley. Analysis of the ecological and geochemical environment in the Dnieper river valley of Rogachev district, Gomel region suggests non-uniform ecological conditions. The most favorable conditions are created on terraces built by sandy deposits while waterlogged near-terrace floodplains are the most dangerous sites in ecological respect. These sites of the valley are less resistant to chemical contamination, and Cu, V and Cr accumulations there are 11,3; 3,3 and 2 times higher than their background values, respectively
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