I. A. Samophalova1, O.B. Rogova2, O.A. Luzyanina1
1Perm State Academy of Agriculture, 614000, Perm, Petropavlovslaya, 23
2V.V. Dokuchaev Soil Science Institute, 119017, Moscow, Pyzhevskii 7, bld. 2
The content and the ratio between the iron forms have been thoroughly studied in mountain soils of the Middle Urals (Northern Baseg). Under consideration are the ratio of iron forms and distribution types of iron compounds along the soil profile. It has been established that in the major soil profiles studied within the mountain-forest belt under the thin forest the content of iron silicate forms in the fine earth is higher by 2 times as compared to non-silicate ones. In soils developed within the mountain-tundra belt under the small mountain forest the above ratio of iron forms seems to be narrow to a considerable extent. The group composition of iron compounds in soils of the studied territory reflects the dependence of changes in their content on the vertical zonality, slope exposition and elevation. The profile distribution pattern and the ratio between the iron forms serve as evidence of physical weathering and such a soil-forming process as the burozem formation; the features of podzolization haven’t been identified. The diagnostics of mountain soils and the definition of their subtypes are given according to the group composition of iron compounds including illuvial-humus, ferruginous, metamorphizeed and eluviated ones. The dry peat podpurs with the ochric subtype (TJ–BH–BFan–CLM) and the ferruginous litho-soddy eluvizem (O–ay–EL–CLMf) have been diagnosed for the first time under conditions of mountain tundra on western macroslop of the Middle Urals.
Keywords: mountain soils, diagnostics, form of iron compounds, soil classification.
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