Rheological Properties of Automorphic and Semihydromorphic Cryometamorphic Northern Taiga Soils in Northeastern European Russia (Komi Republic)

Soil pastes at the water content corresponding to the maximum swelling of samples from different genetic horizons of cryometamorphic soils―surface-gleyic iron-illuvial svetlozem (Folic Albic Stagnosol) and peaty and peat humus-impregnated gleyic svetlozems (Histic Gleyic Stagnosols)―have been studie...

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Bibliographic Details
Published in:Eurasian soil science 2018-04, Vol.51 (4), p.418-427
Main Authors: Kholopov, Yu. V., Khaidapova, D. D., Lapteva, E. M.
Format: Article
Language:English
Subjects:
Analysis
Bonding strength
Clay
Decomposing organic matter
Earth and Environmental Science
Earth Sciences
Elastic properties
Freezing
Geotechnical Engineering & Applied Earth Sciences
Humic acid
Humic acids
Humus
Interaction parameters
Interactions
Iron
Moisture content
Pastes
Peat
Podzolic soils
Properties
Rheological properties
Soil
Soil Physics
Soil properties
Soil water
Soils
Taiga
Viscoelasticity
Water content
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Summary:Soil pastes at the water content corresponding to the maximum swelling of samples from different genetic horizons of cryometamorphic soils―surface-gleyic iron-illuvial svetlozem (Folic Albic Stagnosol) and peaty and peat humus-impregnated gleyic svetlozems (Histic Gleyic Stagnosols)―have been studied with an MCR-302 modular rheometer (Anton Paar, Austria). It has been found that the strongest interparticle bonds are formed in the horizons of cryometamorphic soils characterized by high contents of humic substances and organomineral Al–Fe–humus compounds. These are horizons of podzol microprofile (Eg and BHF) in iron-illuvial svetlozem and a humus-impregnated horizon (ELhi,g) in peaty and peat svetlozems. Organomineral Al–Fe–humus compounds, as well as the seasonal freezing of soils, determine the elastic-brittle character of interparticle interactions. The contents of clay fractions, exchangeable bases, and organic and organomineral substances impart viscoelastic properties to these contacts. An enhancement of elastic-brittle properties of soil is observed under the impact of gleying and freezing. The threefold decrease of the structural interaction parameter (∫ Z ) when going from automorphic to semihydromorphic conditions indicates a decrease in the resistance of peaty and peat svetlozems to mechanical loads under increasing hydromorphism compared to iron-illuvial svetlozems.
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229318040075