Abstract
Soils developed from the red-brown Neogene clay and the Quaternary loesslike loams have been studied in the south of the forest-steppe zone on the Central Russian Upland. A polygenetic nature of the soil profile on the loesslike loams is shown. The modern pedogenetic processes in this soil ensure its eluvial-illuvial differentiation with the development of multilayered coatings in the illuvial horizon. The soil developed from the Neogene clay has a lower degree of differentiation despite the more acid reaction. The micromorphological study of the coatings and the mineralogical analysis of the clay fraction separated from the coatings and from the intraped mass disclose differences in the geneses of B horizons of the two soils. In the soil developed from the loesslike loam, hydromica predominates among clay minerals of the coatings; in the soil developed from the red-brown clay, smectitic minerals predominate in the clay fraction. Differences in the properties of these two parent materials predetermined differences in the major directions of soil formation: the metamorphic pedogenesis predominates on the red-brown clay, whereas the textural differentiation develops in the soil on the loesslike loam. The middle horizons in the studied soil profiles are referred to as the structural-metamorphic and textural (clay-illuvial) horizons, respectively.
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Original Russian Text © S.N. Lesovaya, M.P. Lebedeva-Verba, N.P. Chizhikova, O.V. Romanov, 2008, published in Pochvovedenie, 2008, No. 11, pp. 1285–1296.
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Lesovaya, S.N., Lebedeva-Verba, M.P., Chizhikova, N.P. et al. Genesis of soils developed from red-brown clays and loesslike loams in the southwest of the Central Russian plain (the Belogor’e reserve). Eurasian Soil Sc. 41, 1137–1147 (2008). https://doi.org/10.1134/S106422930811001X
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DOI: https://doi.org/10.1134/S106422930811001X