Morphological and chemical properties of the meadow-semidesert soil complexes of the Khaki playa (the Caspian Lowland) and the influence of the biogenic factor on them |
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Authors: | N P Shabanova M P Lebedeva-Verba A V Bykov |
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Institution: | 1.Institute of Forestry,Russian Academy of Sciences,Uspenskoe, Moscow oblast,Russia;2.Dokuchaev Soil Science Institute,Moscow,Russia |
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Abstract: | The initial stage of the development of the complex soil cover pattern in the Caspian Lowland was studied. The obtained data
made it possible to reveal the specific features of the morphological and chemical properties of the soils on terraces of
the Khaki playa and the role of burrowing animals in the formation of the microtopography and complex soil cover patterns
on the youngest surfaces. The soil cover of the studied area consists of three-component complexes: light-humus quasi-gley
solonetzes on relatively flat background surfaces, zooturbated solonetzes on microhighs, and humus quasi-gley soils in microlows.
The layered deposits of the Khaki playa terraces and the shallow depth of the saline groundwater are responsible for the specificity
of the modern salinization of the studied solonetzes. The distribution of the salts in their profiles has a sawshaped patter,
which is related to the nonuniform texture of the deposits. On the microhighs composed of the earth extracted from 5- to 7-year-old
suslik burrows, specific zooturbated solonetzes are formed. The known age of these formations makes it possible to determine
the rate of the desalinization of the gypsum- and salt-bearing material extracted onto the soil surface and the rate of the
salt accumulation in the lower part of the solonetzic horizon and in the subsolonetzic horizons in comparison with the data
on the solonetzes of the background flat surfaces. The specific features of the soils in the closed microlows suggest that
these soils have a polygenetic origin. The features of the recent hydromorphism predetermine the specificity of their morphology. |
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