[Migration of chemical elements in soils of the Dnieper river valley at the Zhlobin - Loyev area]
Ryabova, L.N.(Institute of Geological Sciences, Minsk (Belarus))
A considerable amount of obtained information describes the landscape and geochemical pattern of the region under investigation, types of parent and soil-forming rocks, some special features observed in the redistribution of major (Si, Al, Fe, Ca, Mg, K, Na, S, P) and trace (Ti, Mn, Cu, Ni, Pb, Co, V, Cr, Zr) elements in soil. The organic matter content, group and fractional composition, medium ph, amounts of exchangeable Ca+2, Mg+2, H+ were also determined in soil samples. Accumulations of MnCr ZrTiAl in the studied soil were found to be 2.5...1.2 times their amounts in soils of Belarus. The studied soils are enriched in CrFeVMnNi (3.0...1.2 times as much) and depleted in Ca, Mg, Ti, Zr as compared to that from the valley in the Dnieper Middle reaches. A terrace floodplain acts as a landscape - geochemical barriers, where considerable amounts of trace elements are accumulated in the sod layer. The Ni concentration was determined to be 1.6 times, Cu - 1.4, Cr - 1.2 times their background values in the Zhlobin region, Cu is 6.0 times, Mn - 3.2, Ni, Pb - 1.2 times their background values in the Rechitsa region, Cu was found there to be 1.5 and Mn - 1.3 times their maximum permissible concentrations, Cr and V were determined to be 2.2 times, Cu - 1.8, Pb - 1.6, Ni - 1.4 times their background values in the Loyev region. Soil of accumulative landscapes show rather high ph values and increased levels of exchange bases. Ca, Mg, Fe were determined to be accumulated there, high amount of Cr, V, Cu were noted at geochemical barriers in illuvial horizons. Investigations carried out showed that heavy metal contamination is transformed in soil with depth depending on the soil granulometric composition, redox conditions, organic matter amount and composition, soil absorbing capacity, presence of radial pedogeochemical barriers
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