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Abstract
High-mountain vegetation of North-West Tuva is characterized by great diversity. We identified 10 associations and one subassociation belonging to six classes of the ecological-floristic classification. This is caused by dissimilarity of climatic conditions determined formation of two types of high-mountain landscapes - alpine and goltsy. Other researchers earlier described most of syntaxa. For the first time we described two associations and one subassociation. Callianthemo sajanensis-Geranietum krylovii ass. nova hoc loco association is placed in Violo altaicae-Festucion krylovianae Ermakov et Zibzeev 2012 prov. provisional alliance and Lagoto integrifoliae-Caricetum ensifoliae ass. nova hoc loco association - in Anemonastro-Festucion ovinae Chytrý et al. 1993 alliance. Both associations are included in Violo altaicae-Festucetalia krylovianae Ermakov et Zibzeev 2012 prov. provisional order of Juncetea trifidi Hadač in Klika et Hadač 1944 class. Communities of Callianthemo sajanensis-Geranietum krylovii ass. nova hoc loco are restricted to gentle plains and concave moderately steep mountain slopes of various exposures of subalpine and montane-tundra belts of North-West Tuva. Associations Lagoto integrifoliae-Caricetum ensifoliae ass. nova hoc loco are typical of the mountain tundra belt of the humid sector of North-East Tuva and occur on gentle slopes of the mountains and mountain terraces. Subassociation (S.o.-R.q.) pedicularietosum fissae subass. nova hoc loco is placed in Rhodiolion quadrifidae Hilbig 2000 alliance, Rhodioletalia quadrifidae Hilbig 2000 order, Rhodioletea quadrifidae Hilbig 2000 class. Coenoses of (S.o.-R.q.) pedicularietosum fissae subassociation are restricted to the mountain tundra belt of the humid sector of North-East Tuva and occur on the slopes of southern and southwestern exposures. We registered that the high-mountain vegetation of North-East Tyva mainly connected to magmatic acid rocks. The western border of subalpine meadow areas is on the western and southwestern slopes of East Sayanfacing, the Todzha Basin.





