Climatic zoning of the territory is classified as a temperate-humid zone. The zonal system-sectorial distribution of vegetation Sidinskiy foothill and Pribaikalsky meadow steppes belongs to the subboreal bioclimatic zone, located on the border of the West-Siberian-Near Asian (continental) and East-Central Asian (sharp continental) sectors. To identify environmental groups of Sidinsky foothill flora and Pribaikalsky meadow steppes floristic studies made by B.A. Yurtsev, B.A. Kamelin and other researches in botany were taken as a basis with a specific binding of environmental groups to habitat type and morpho- physiological properties of the species. Ecological groups of species of flora in relation to the humidification area of research are xerophytes, steppe mesoxerophytes, mesophytes, xeromesophytes, mesopsihrofyts, hygrophytes, mesohygrophyte, hydrophytes. Among xerophilous species is a large percentage of endemic species reaching 3,9 % Also calcium substratum is able to save various relict elements having isolated growth and sharp differences with the surrounding zonal vegetation. When considering the opposite groups xerophilous is 46 %, mesophilic is 37,7 % and hygrophilic is 16,5 % series, observed superiority xerophilous number over mesophilic and hygrophilic, characterize the flora of the study as xeromesophilic, plain and continental, which corresponds to the zonal position at the border of the subboreal and boreal region. The basis of the studied steppe flora is xerophytic and mesophytic species groups (species 832, 82,7 % of the total flora). A small percentage of species of mesophilic range, the presence of endemics and relicts in the flora Pribaikalsky meadow steppe shows the combination of autochthonous and allochthonous trends in the development of the flora.
environmental groups, mesophytes, xerophytes, hygrophytes, hydration of nabitation, geological past, endemic
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