2. On the existing soil maps, information on cryogenic conditions, processes, and features in soils (pedocryological information) is insufficient. It is reasonable to develop pedocryological maps. The analysis of special geocryological and soil maps of Russia (1:2.5 M scale) shows the prospects of using the soil map for the pedocryological interpretation.
3. Small-scale maps of cryogenic conditions and phenomena in soils of Russia are demonstrated. The map of pedocryogenic conditions provides the following information: (I) soil temperature characteristics (mean annual temperature, amplitude of temperatures, minimal soil temperature (0.2 m), presence and depth of permafrost (for permafrost-affected soils), average and maximum depths of soil freezing, unidirectional or two-directional /from the top and from the bottom/), character of soil freezing and thawing, duration of the frozen state of soils, etc; (II) soil moisture characteristics (soil water content before freezing, ice content in the permafrost and in the freezing soil layer, forms of ice segregation); and (III) additional information on soil texture and mineralogy, pebble content, and the presence and thickness of the insulating peat (litter) layer. The map of cryogenic phenomena displays information on the geography of particular forms of soil cryogenesis: cryogenic cracking, different forms of frost polygons, cryoturbation, sorting of coarse fragments, frost heave, solifluction, thermokarst, etc. The development of cryogenic ooidal and platy structures is also shown. A separate group of paleocryogenic features in surface soils is distinguished. The effect of zonal and provincial climatic conditions and regional lithogeomorphic features on the geography of cryogenic conditions and phenomena in Russian soils is discussed.
4. We suggest that a similar approach can be applied to add more detailed pedocryological information to the Circumpolar Soil Map developed under the aegis of the Cryosol working group.
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