Dark-humus soils on the updated soil map of Russian Federation scale 1 : 2.5 M
https://doi.org/10.19047/0136-1694-2021-108-31-54
Abstract
The dark-humus soil type was included in the updated legend of the Soil Map of the Russian Federation at scale 1 : 2.5 M, converted to the system of Soil Classification of Russia. The soil profile starts with the dark-humus horizon gradually merging to the parent rock; any mid-profile diagnostic horizons are absent. Large areas of dark-humus soils are found in the forest-steppe, steppe and taiga zones of the European Russia, Western and Central Siberia, in the Trans-Baikal region, the Altai-Sayany Mountains, and the Caucasus. The type of dark-humus soils comprises both mesomorphic soils (of normal moisture conditions) and soils with additional surface or ground-water moisture. The main prerequisites for the formation of dark-humus soils are, on the one hand, the climatic conditions favorable for the dark-humus horizon formation, and, on the other hand, parent material - mostly derivates of hard rocks, restricting the development of mid-profile diagnostic horizons. In the updated map, the following initial legend units are partially or completely converted to dark-humus soils: several units of chernozems, dark-gray forest and gray forest non-podzolized soils, soddy-taiga base-saturated and slightly unsaturated soils, several mountain soils, a significant part of soddy-calcareous soils, as well as some mountainous forest-meadow soils. The diversity of dark-humus soils subtypes is determined by secondary carbonate features, weak signs of clay accumulation and podzolization, alteration of the mineral mass, gley and cryogenic phenomena.
About the Authors
T. V. Ananko
Federal Research Centre “V.V. Dokuchaev Soil Science Institute”
Russian Federation
Russian Federation
M. I. Gerasimova
Federal Research Centre “V.V. Dokuchaev Soil Science Institute”; Lomonosov Moscow State University
Russian Federation
Russian Federation
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1. Fig. 1. Dark-humus soils in the updated Soil Map of the Russian Federation at scale 1 : 2.5 M. | |
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For citations:
Ananko T.V., Gerasimova M.I. Dark-humus soils on the updated soil map of Russian Federation scale 1 : 2.5 M. Dokuchaev Soil Bulletin. 2021;(108):31-54. (In Russ.) https://doi.org/10.19047/0136-1694-2021-108-31-54
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