Eurasian Soil Science

, Volume 48, Issue 6, pp 555–566 | Cite as

Soils of slopes in the taiga zone of the Middle Ob reaches

  • N. A. Karavaeva
  • T. A. SokolovaEmail author
Genesis and Geography of Soils


The morphology, chemical properties, composition of phyllosilicates, as well as their transformation in loamy soils developing on slopes of ridges of the Vakh Upland in Western Siberia, are discussed. Data on two soil profiles-gleyic svetlozem of the middle slope and podzolized gleyzem of the footslope—are presented. Both soils have an acid reaction. The textural differentiation is weakly pronounced in the gleyic svetlozem and more pronounced in the podzolized gleyzem. The soils differ in their cryological conditions. The thawing depth in the svetlozem is about 60–70 cm, and the lower part of the profile to a depth of 3.2 m largely remains in the frozen state. Its complete thawing is only possible during the warm climatic cycles. This is a seasonally frozen soil with the long-lasting frozen state. It is characterized by the thick cryometamorphic (CRM) horizon. The gleyzem is a “normal” seasonally frozen soil with complete thawing of seasonal frost in summer. The CRM horizon is absent in its profile. The alteration of clay minerals in the soil profiles includes their partial dissolution, the formation of soil chlorites, and the transformation of illite into more labile structures. In the upper horizons of both soils, this transformation proceeds through the stage of mixed-layered illite-smectites. In the gleyzem, it reaches a more advanced stage of the formation of beidellite. The cryometamorphic horizons are specified by some amorphization of phyllosilicates and, probably, by the partial dissolution of their crystal lattices under the impact of frequent zero-temperature transitions and cryogenesis in the frozen state.


gleyic svetlozem (Histic Albic Retisol (Loamic, Cutanic)) podzolized gleyzem (Histic Reductigleyic Gleysol (Loamic, Gelic)) transformation of clay minerals phase transitions of soil water frost cryogenesis 


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© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  1. 1.Institute of GeographyRussian Academy of ScienceMoscowRussia
  2. 2.Faculty of Soil ScienceMoscow State UniversityMoscowRussia

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