Genesis and classification position of automorphic soils developed from mantle loams in the northern taiga of European Russia |
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Authors: | V D Tonkonogov A V Pastukhov I V Zaboeva |
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Institution: | (1) Dokuchaev Soil Science Institute, Pyzhevskii per. 7, Moscow, 119017, Russia;(2) Institute of Biology, Komi Science Center, Ural Division, Russian Academy of Sciences, Kommunisticheskaya ul. 28, Syktyvkar, 167982, Russia |
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Abstract: | Automorphic loamy soils of the northern taiga and forest-tundra zones in the northeastern part of European Russia are characterized.
These soils are diagnosed by the presence of a paragenetic system of the podzolic (often, with gley features) and iron-illuvial
horizons combined with a specific cryometamorphic CRM horizon. The podzolic horizon is considerably impoverished in the total
and oxalate-extractable iron and slightly impoverished in aluminum and clay in comparison with the iron-illuvial horizon.
A distinctive feature of the cryometamorphic horizon is its fine angular blocky, ooidal, or granulated structure in the dry
state and curdled cryogenic structure in the wet state. The soil profile is relatively weakly differentiated with respect
to the contents of clay and sesquioxides. The genesis of these soils is related to a combination of the gley-Al-Fe-humus mobilization,
migration, and illuvial accumulation of substances and the cryogenic structuring. According to the new Classification and Diagnostic System of Russian Soils, these soils fit the criteria of iron-illuvial svetlozems in the order of cryometamorphic soils. In the studied area, these
soils are found together with texture-differentiated gley-podzolic soils having the Bt horizon and belonging to the order
of texture-differentiated soils. |
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