Abstract
The Academician Obruchev Range is situated between Central Asian and the South Siberian high mountains. Residual influence of western moist air masses, constant influence of southern anticyclone in summer and northern one in winter form the semi-humid climate type of this region. The altitudinal belt vegetation structure of the western and central part of the southern macroslope of the Academician Obruchev Range belong to the East-Tuva semi-humid continental type. The upper limit of forests lies at the altitude about 1800 meters above s. l. The high-mountain belt is subdivided into two flora-coenotic complexes: the lower one (1800—2000 meters above s. l.) with domination of moss–Betula rotundifolia shrub tundras and light forests, and the higher one (2000—2200 meters above s. l.) with lichen, dryad, crowberry and grass tundras prevalence. The plant communities belong to 19 associations, 9 formations, 8 florocoenotypes and 3 ecological-historical series. The cryohemixerophilous ecological-historical community series of mountain genesis, that were formed in moderately dry and cold environments, occupy the leading positions in high-mountain vegetation structure. The most widely spread communities of cryo-mesophilous ecological-historical series are light Pinus sibirica forests.
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