Clay minerals in chernozem-like soils of mesodepressions in the northern forest-steppe of European Russia |
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Authors: | T A Sokolova F R Zaidel’man T M Ginzburg |
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Institution: | 1.Faculty of Soil Science,Moscow State University,Moscow,Russia |
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Abstract: | In the northern forest-steppe of European Russia, under the conditions of surface waterlogging (freshwater) and a stagnant-percolative
regime, gleyic podzolic chernozem-like soils with thick light-colored eluvial horizons are formed. These horizons are close
or similar to the podzolic horizons of bog-podzolic soils in many properties of their solid phase. They are bleached in color
and characterized by the removal of Ca, Mg, Fe, Al, and Mn and the relative accumulation of quartz SiO2. These soils differ from leached chernozems in their acid reaction and very low CEC, the presence of Fe-Mn concretions and
coatings, and the significant decrease in the clay content in the A2 horizon as compared to the parent rock.
The soils studied differ significantly from loamy podzolic and bog-podzolic soils by the composition of the clay minerals
in the A2 horizons: (1) no essential loss of smectite minerals from this horizon was found as compared to the rest of the
solum, (2) pedogenic chlorites (HIV and HIS) are absent, and (3) the distinct accumulation of illites is observed as compared
to the subsoil and parent material, probably, due to the process of illitization. |
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