Forms of acid hydrolysis and gley formation and their role in the development of light-colored acid eluvial (Podzolic) horizons

Nowadays, three processes, namely lessivage, acid hydrolysis, and gleying, are considered as responsible for the development of loamy and clayey podzolic soils. However, as was shown earlier, lessivage is not obligatory for their origin. In view of assessing the reasons for the formation of light-co...

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Bibliographic Details
Published in:Eurasian soil science 2010-04, Vol.43 (4), p.357-367
Main Author: Zaidelman, F.R
Format: Article
Language:English
Subjects:
Acids
Aerobic conditions
Anaerobic conditions
Clay
Earth and Environmental Science
Earth Sciences
Genesis and Geography of Soils
Geochemistry
Geotechnical Engineering & Applied Earth Sciences
Hydrology
Hydrolysis
Leaching
Soil profiles
Soil sciences
Soils
Stagnant water
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Summary:Nowadays, three processes, namely lessivage, acid hydrolysis, and gleying, are considered as responsible for the development of loamy and clayey podzolic soils. However, as was shown earlier, lessivage is not obligatory for their origin. In view of assessing the reasons for the formation of light-colored acid eluvial horizons, this article deals with the role of acid hydrolysis under aerobic conditions against the background of a percolative water regime and of two forms of gleying in the development of the horizons mentioned above. One form of gleying occurs under permanent anaerobic conditions against the background of a stagnant water regime; the other one is formed under pulsating anaerobic-aerobic conditions against the background of a stagnant-percolative water regime. As a result, three large genetically individual groups of soils are formed: nondifferentiated brown and gley, and differentiated podzolic soils on different parent rocks. The two latter forms of gleying are identical in their effects on the mineral substrates. They cause the iron removal from the soils. Among the three processes considered, the last one (gleying under a stagnant-percolative water regime) is the single reason for the leaching of most of the metals, the formation of light-colored acid eluvial horizons and their clay depletion, and for the differentiation of the soil profile.
ISSN:1064-2293
1556-195X
DOI:10.1134/S1064229310040010