Microstructure of genetic horizons in automorphic soils of the Timan Ridge |
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Authors: | E V Zhangurov M P Lebedeva I V Zaboeva |
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Institution: | 1.Institute of Biology, Komi Scientific Center, Ural Branch,Russian Academy of Sciences,Syktyvkar,Russia;2.Dokuchaev Soil Science Institute,Russian Academy of Agricultural Sciences,Moscow,Russia |
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Abstract: | Data are presented on the physicochemical composition and specific macro-, meso- and micro-morphological features of automorphic
soils formed on silty loams in the northern and middle taiga subzones of the Timan Ridge. These soils have a texture-differentiated
profile and are well aggregated, which is manifested at all levels of structural organization of the soil mass. The morphological
structure of the middle soil horizons is characterized by the presence of specific nongleyed cryometamorphic horizon CRM.
Its formation is due to the development of long-term seasonal cryogenic processes in relatively deep (up to 40 cm) light and
medium loam deposits under conditions of the northern and middle taiga subzones. The processes of cryometamorphism, combined
with Al-Fe-humus and textural differentiation, result in the formation of podzolic, iron-illuvial, cryometamorphic, and textural
horizons (O-E-BF-CRM-BT). The textural horizons have a set of micromorphological features indicating that recent clay illuviation
is a weak process. |
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Keywords: | |
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