Study On Woody Flora In Inner Mongolia

Used principle of floristic plant geography,and based on the composition of families , genera and modern geographical distribution of families, genera and species.The composition and characteristic of woody plant was studied in Inner Mongolia.We expatiated on general situation of rare and endangered plants in Inner Mongolia. The results showed as follows:1. There are 432 species of woody plants which belong to 51 families and 131 genera in Inner Mongolia. Angiosperms is dominant ;Rosaceae,Salicaceae,Leguminosae,Compositae,Caprifoliaceae are dominant families; Salix,Caragana,Populus,Spiraea,Betula are predominant genera.2. The floristic characters:(1)Plant species is poor, distribution was unequal.(2)There is remarkable ancient origins and vestige.(3)Woody flora showed the temperate floristic elements are predominant in the area, and north temperate is predominant on floral and geographical components.(4)Their specificities are less, distribution centralize.(5)Life form is mainly shrub, ecological type is dominated by mesophyte, dried fruit predominated in fruit type.(6)The phenomenon of horizontal substitute is obvious.(7)Flora is frangible.3. There are 48 rare and endangered plants in Inner Mongolia, and 16 of species listed in protected key woody plants of China, and 35 species were listed in rare and endangered woody plants of Inner Mongolia.