Mineralogical comparative analysis of the clay fraction of solonetz and chestnut soil without apparent microrelief in the north-western part of the Caspian lowland
https://doi.org/10.19047/0136-1694-2020-101-159-181
Abstract
A comparative analysis of the mineralogical composition of the clay fraction (< 1 μm) of chestnut soil and solonetz has been performed in the article. Soils were studied in the oldest part of the Caspian lowland in north-west where the microrelief is not quite apparent (microdepressions no more than 5–10 cm depth), but with a contrast soil cover. The content of silt fraction in chestnut soil varies from 25.6 to 33.9%, in the solonetz – from 11.7 to 51.6%. In all horizons of the compared soils, except for the upper surface horizons (SEL, AU1), mixed-layered minerals dominate (39–52% in the fraction) over illite (27–37% in the fraction). In the surface horizons illite (48%) dominates over mixed-layer minerals (35%). The compared soils have some similarities in their crystal-chemical state: the imperfection of the kaolinite structure and the superdispersed state of the mixed-layer phase in the upper horizons, as well as the appearance of individual smectite and chlorite packets in the mixed-layer phase in the lower horizons (BC, C). The degree of perfection of the kaolinite structure both in the solonetz and in the meadow-chestnut soil increases towards the bottom of the profiles. The obtained data allow suggesting that in the meadow-chestnut soil the clay phase retained traces of the solonetzic stage of soil formation.
About the Authors
N. A. Churilin
V.V. Dokuchaev Soil Science Institute
Russian Federation
Nikita A. Churilin
Russian Federation
Nikita A. Churilin
M. P. Lebedeva
V.V. Dokuchaev Soil Science Institute
Russian Federation
Marina P. Lebedeva
Russian Federation
Marina P. Lebedeva
E. B. Varlamov
V.V. Dokuchaev Soil Science Institute
Russian Federation
Evgeniy B. Varlamov
Russian Federation
Evgeniy B. Varlamov
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Review
For citations:
Churilin N.A., Lebedeva M.P., Varlamov E.B. Mineralogical comparative analysis of the clay fraction of solonetz and chestnut soil without apparent microrelief in the north-western part of the Caspian lowland. Dokuchaev Soil Bulletin. 2020;(101):159-181. (In Russ.) https://doi.org/10.19047/0136-1694-2020-101-159-181
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