The soils of forest tundra, taiga and forest steppe zones of eastern provinces of Western Siberia have been investigated. The northern territories are included in permafrost zone, relicts of which one can find further south. All soils can be characterised by long seasonal freezing.

At the aggregate level one has investigated the aggregate form, redistribution of plasma inside the unit, new formations, their form and distribution in the soil depending on depth of seasonal freezing.

At the horizon and soil profile level, in different latitudes there were investigated phenomena’s accompanying forming of icy frost and consequences of its prolonged traving (frost-shattered wedges, cryogenic mixing and invasions, platy mesh cryogenic texture).

In the structure of soil cover the paleocryogenic influents realises itself in distribution of polygonalle and hillock-depression relief forms. In southern provinces there forms can be found on different stages of degradation. The numerous lakes of termokarst genesis stimulates further flooding of the territory.

There were determined essential distinctions in the sum of active temperatures in combination podsolic and boggy soil.

Provincialle features of cryogenesis are heating increasing to the east and frequent permafrost. Permafrost in soils have been found in latitude 59’50". The most southern point with temporary permafrost peat bogs was found in latitude 58’30".

Lydmila I. Gerasko
Research Institute of Biology and Biophysics
Tomsk State University
Department of Soil Science
Lenin Street, 36
Tomsk, 634050, Russia
Phone: (382-2)410252
Fax: (382-2)223012
E-Mail: soil@biobase.tsu.tomsk.su