Валовий хімічний склад темно-сірих опідзолених ґрунтів Малого Полісся і його трансформація в процесі антропогенези

Abstract

Dark gray podzolized soils (Phaeozems Albic (PHad), WRB, 1998) are typical for the natural area of Pasmove Pobuzhia physiographic oblast of the Small Polissya. The investigation of the transformation of the gross chemical composition of dark gray podzolized soils of Small Polissya due to erosion processes conducted for the first time, confirming the relevance of the research. Standard methods of research were used in the investigation of the 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 dominated 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 the 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 the 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, 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 %. The 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 the arable layer the content of SiO2 is decreasing, reaching values of 79,63–80,84 % in strongly eroded. The content of other oxides tends to increase as well as decrease comparing to non-eroded soil. The correlation between wash out level and molar magnitude ratios 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 being narrowed, which indicates accumulation in arable horizons of aluminium, including oxides in general, compared with non-eroded types. The content of the constitutional water increases and expands the coefficient of the silica changes, indicating the strengthening of internally soil deflation processes in the arable layer of erosion-degraded dark gray podzolized soils compared to non-eroded types. Key words: dark gray podzolized soils, gross chemical composition, oxides, degradation.