Arealogical and Ecotypological Compositions of the Flora of Plant Communities at Environment Contact Sites (Based on Some Pre-Baikal Sites)

Abstract

The study of phytocenoses of transitional environmental conditions in the Pre-Baikal Region enabled to reveal modern tendencies of vegetation development in different Pre-Baikal sites. Such cenoses can serve as a regional model for indication of existing processes and of changes in vegetation structure which occurred under different environmental conditions. It is found out that ecotones and cenoses reflecting the paragenese in vegetation structure indicate structuraldynamic peculiarities of the organization of Pre-Baikalian vegetation cover as a whole. They are valid for classification and characterize intrazonal differences in vegetation structure at vaste territories. Ecotones and paragenese in the vegetation structure in the studied area reflect physical and geographical conditions of their formation for a definite time period.