Abstract
Morphological, physicochemical, and isotopic properties of a two-member soil complex developed under dry steppe have been studied in the central part of the Manych Depression. The soils are formed on chocolate-colored clayey sediments, and have pronounced microrelief and the complex vegetation pattern. A specific feature of the studied soil complex is the inverse position of its components: vertic chestnut soil occupies the microhigh, while solonetz is in the microlow. The formation of such complexes is explained by the biological factor, i.e., by the destruction of the solonetzic horizon under the impact of vegetation and earth-burrowing animals with further transformation under steppe plants and dealkalinization of the soil in the microhighs. The manifestation of vertic features and shrink-swell process in soils of the complex developing in dry steppe are compared with those in the vertic soils of the Central Pre-Caucasus formed under more humid environment. It is supposed that slickensides in the investigated vertic chestnut soil are relict feature inherited from the former wetter stage of the soil development and are subjected to a gradual degradation at present. In the modern period, vertic processes are weak and cannot be distinctly diagnosed. However, their activation may take place upon an increase of precipitation or the rise in the groundwater level.
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Original Russian Text © I.V. Kovda, E.P. Morgun, L.P. Il’ina, 2013, published in Pochvovedenie, 2013, No. 1, pp. 3–16.
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Kovda, I.V., Morgun, E.P. & Il’ina, L.P. Complex of solonetzes and vertic chestnut soils in the manych-gudilo depression. Eurasian Soil Sc. 46, 1–14 (2013). https://doi.org/10.1134/S1064229313010055
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DOI: https://doi.org/10.1134/S1064229313010055