COMPARATIVE ANALYSIS OF THE SPECIES COMPOSITION OF PLANT COMMUNITIES OF THE COASTAL FORESTS OF THE TENGA AND BURNINSKY ISLANDS
A research of the vegetation of the islands of the Ust-Ilimsk reservoir Tenga and Burninsky Bratsk district of the Irkutsk region was done. Analyzed the taxonomic and arealogic structure of the flora of the study area. The basis of the flora are angiosperms (320 species, 97%). The ratio of the number of dicotyledonous and monocotyledonous species is 3.27: 1, which practically coincides with the similar ratio in the flora of the Irkutsk Region (2.7: 1). The top ten families contain 110 genera (58.8% of the total number of genera), covering 199 species (60.3% of the total diversity). In the flora of the islands Burnynsky and Tenga especially typical dominants of boreal floras are represented - family Asteraceae, Poaceae (18.5% of the total flora). In the course of the arealogic analysis, a significant predominance of species that have a circumpolar or boreal holarctic range is established - 91 species, which is 27.6% of the total flora; The Euro-Asian range - 80 species, which corresponds to (24.2%) flora and the Euro-Siberian range - 58 species, which is 17.6% of the total flora.