Specific Features of Profile Distribution and Crystallochemistry of Phyllosilicates in Soils of the Cisbaikal Forest-Steppe
- Authors: Chizhikova N.P.1, Gamzikov G.P.2, Chechetko E.S.1
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Affiliations:
- Dokuchaev Soil Science Institute
- Novosibirsk State Agrarian University
- Issue: Vol 51, No 1 (2018)
- Pages: 96-111
- Section: Mineralogy and Micromorphology of Soils
- URL: https://journals.rcsi.science/1064-2293/article/view/224387
- DOI: https://doi.org/10.1134/S1064229318010052
- ID: 224387
Cite item
Abstract
The mineralogical composition of agrogray, dark gray, and agro-dark gray soils (Luvic Greyzemic Retic Phaeozems); agro-dark gray residual-calcareous soils (Calcaric Cambic Phaeozems); clay-illuvial agrochernozems (Luvic Chernic Phaeozems); and agrochernozems with migrational–mycelial carbonates (Haplic Chernozems) developed in the forest-steppe of Central Siberia within the Irkutsk Depression has been studied. The clay (<1 μm) fraction separated from these soils consists of mixed-layer minerals with alternating layers of hydromica, smectite, vermiculite, and chlorite; the proportions between them change within the soil profiles. The clay fraction also contains hydromicas, kaolinite, chlorite, and some admixture of the fine-dispersed quartz. Each type of the soils is characterized by its own distribution pattern of clay material with specific alternation of layers in the mixed-layer formations. Mixed-layer minerals of the chlorite–vermiculite type predominate in the upper horizons of texture-differentiated soils. Down the soil profile, the content of mixed-layer mica–smectitic minerals increases. In the clay fraction of arable dark gray-humus soils with residual carbonates, the distribution of the clay fraction and major mineral phases in the soil profile is relatively even. An increased content of well-crystallized kaolinite is typical of these soils. The parent material of agrochernozems has a layered character: the upper horizons are generally depleted of clay, and the middle-profile and lower horizons are characterized by the considerable kaolinite content. In general, the clay material of soils of the Tulun–Irkutsk forest-steppe differs considerably from the clay material of foreststeppe soils developed from loesslike and mantle loams in the European part of Russia. In particular, this difference is seen in the proportions between major mineral phases and between biotitic and muscovitic components, as well as in the degree of crystallinity and behavior of kaolinite and chlorite.
About the authors
N. P. Chizhikova
Dokuchaev Soil Science Institute
Email: gamolgen@mail.cis.ru
Russian Federation, per. Pyzhevskii 7, Moscow, 119017
G. P. Gamzikov
Novosibirsk State Agrarian University
Author for correspondence.
Email: gamolgen@mail.cis.ru
Russian Federation, ul. Dobrolyubova 160, Novosibirsk, 633039
E. S. Chechetko
Dokuchaev Soil Science Institute
Email: gamolgen@mail.cis.ru
Russian Federation, per. Pyzhevskii 7, Moscow, 119017
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