Geochemical Transformations in Liquid and Solid Phases of Sod–Podzols in Technogenically Disturbed Landscapes of the Moscow Brown Coal Basin

This paper examines effects caused by erosion products and seepage waters spreading from sulfuric coal dumps for more than 50 years on the chemical composition and properties of solid and liquid (soil solutions) phases of nearby sod–podzols in the south-taiga zone. The study was conducted at the Che...

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Bibliographic Details
Published in:Moscow University soil science bulletin 2021, Vol.76 (5), p.283-290
Main Authors: Kostin, A. S., Krechetov, P. P., Chernitsova, O. V., Terskaya, E. V.
Format: Article
Language:English
Subjects:
Acidification
Aluminum
Calcium
Calcium ions
Calcium sulfate
Chemical composition
Coal
Decomposing organic matter
Earth and Environmental Science
Earth Sciences
Geochemistry
Historical Geology
Humus
Hydroxides
Ions
Iron
Lignite
Magnesium
Paleontology
Physicochemical properties
Podzols
Seepage
Sod
Soil adsorption
Soil properties
Soil solution
Soils
Solid phases
Sulfates
Taiga
Taiga & tundra
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Summary:This paper examines effects caused by erosion products and seepage waters spreading from sulfuric coal dumps for more than 50 years on the chemical composition and properties of solid and liquid (soil solutions) phases of nearby sod–podzols in the south-taiga zone. The study was conducted at the Cherepetskoye brown coal field, Tula oblast, Russia. The physicochemical properties of these posttechnogenic soils have no parallel in natural south-taiga landscapes of the Russian Plain. The main geochemical processes in technogenically transformed sod–podzols are as follows: (1) acidification, including changes in the ionic composition of soil solutions and their transformation from hydrocarbonate–sulfate–calcium to sulfate–aluminum–calcium ones; and (2) replacement of Ca 2+ and Mg 2+ ions with Al 3+ and H + ions in the soil adsorption complex (SAC). The transformed soils feature a very low (less than 20%) base saturation degree, and their solutions are oversaturated with Fe 3+ and Al 3+ hydroxides. Changes in the soil solution composition intensify the podzol formation process causing ferruginization of the illuvial horizon due to the active Al–Fe–humus process; as a result, the studied soils gain features typical for middle- and north-taiga podzols.
ISSN:0147-6874
1934-7928
DOI:10.3103/S0147687421050021