Академическое издательство «Гео»

Geocryological zonality, non-cryogenic subzone, seasonal freezing, fir forest with high grass, cryogenic formations



KRIOSFERA ZEMLI, 2007, Vol. XI, № 4, p. 15-19

Western Altai: features of the altitudinal geocryological zonality

A.P. Gorbunov, E.V. Severskiy

Permafrost Institute SB RAS, Kazakhstan Alpine Geocryological Laboratory,
050000, Almaty, P/O box 138, Kazakhstan, permafrost@nets.kz

The mountains of Western Altai (the Kazakhstan’s part) are characterized by unique geocryological zonality. Here, within 600–1500 m a.s.l., there is no seasonal freezing of soils. The main reason is that the thick snow cover (more than 2 m) in the fir forests covers the thick layer of fading high grasses. This determines the features of the altitudinal geocryological zonality. In the low sub-belt at foothill steppe plain to 400 m a.s.l. the depth of seasonal freezing reaches 3.5 m. From 400 to 600 m the depth of seasonal freezing significantly decreases with increasing snow cover. Within the limits of 600–1500 m a.s.l. there is non-cryogenic subzone where freezing of soils is absent. There is a permafrost zone above 1500 m a.s.l.

Geocryological zonality, non-cryogenic subzone, seasonal freezing, fir forest with high grass, cryogenic formations
главная

www.izdatgeo.ru