GROSS CHEMICAL COMPOSITION OF DARK GRAY PODZOLIZED SOILS OF SMALL POLISSYA AND ITS TRANSFORMATION CAUSED BY HUMAN IMPACT
Journal Title: Вісник Львівського університету. Серія географічна - Year 2016, Vol 50, Issue
Abstract
Dark gray podzolized soils (Phaeozems Albic (PHad), WRB, 1998) are typical for the natural area of Pasmove Pobuzhzhia of the physiographic region of Small Polissya. The investigation of the transformation of gross chemical composition of dark gray podzolized soils of Small Polissya due to the erosion processes is conducted for the first time, that is confirmed by the relevance of the research. Standard methods of research were used in investigation of gross chemical composition of dark gray podzolized soils. The research results have been worked out according to the methodology of Y. Arynushkina and N. Myakina. According to the research, SiO2 dominate in all genetic soil horizons. Its content in the humus-accumulative horizon is 82.06 % by weight of calcined soil, decreasing to 74.45 % in soil rock. Different distribution of silica in the soil profile indicates the poor process of podzolic soil development. Among oxides in the soil profile dominates Al2O3, it contents in humus-accumulative horizon is 8,10 %. A slight accumulation of Aluminium oxides was found in horizon confirming weak profile differentiation by eluvial-alluvial type. Content of Fe2O3 oxides in soil profile is low variadic in the arable layer and the content is 2.30 %. Oxides of CaO content ranges from 0,75 % in the horizon He to 6,17 % in soil rock, and the content of oxides MgO, is respectively, from 0.65 % to 1.06 %. Gross content of iron oxides, titanium, manganese, sodium, potassium, phosphorus and sulfur in the soil genetic horizons ranges from 0,04 % to 2,39 %. Estimated ratio between the major oxides and their profile distribution also confirm weak profile differentiation of dark gray podzolized soils. The content of the constitutional water of humus He horizon of dark gray podzolized soils is 1.57 %. Increase of constitutional water in the middle of the profile may be caused by increasing of internally soil deflation processes. This is also confirmed by the growth of silica coefficient changes of the soil at the same depth. In eroded dark gray podzolized soils of arable layer the content of SiO2 is decreasing, reaching values of 79,63–80,84 % in strongly eroded occurrences. The content of other oxides tends to increase as well as to decrease comparing to non-eroded soil. The correlation between wash out level and molar magnitude ratios is being observed in eroded soils. With erodation increase the ratio of SiO2: Al2O3 and SiO2: R2O3 is narrowing, that indicates on the accumulation of aluminium in arable horizons, including oxides in general, compared to non-eroded types. The content of the constitutional water increases and the coefficient of the silica changes increases, indicating the strengthening of internally soil deflation processes in the arable layer of erosion-degraded dark gray podzolized soils compared to non-eroded types.
Authors and Affiliations
Volodymyr Haskevych
Keywords
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