美姑大风顶自然保护区种子植物区系分析

四川美姑大风顶国家级自然保护区有种子植物 1 1 8科 ,3 85属 ,860种 ,其中裸子植物 5科 ,1 6属 ,1 9种 ;被子植物 1 1 3科 ,3 69属 ,841种。种子植物属、种的区系成分共有 1 3个类型 ;在所有成分中 ,以温带区系成分为主 ,达 1 81属 ,占总属数的 5 1 .5 8%。中国特有分布属共 1 1属 ,占总属数的 3 .1 3 % ;中国特有分布种共41 0种 ,占总种数的 48.41 %。保护区共有珍稀濒危植物 1 8种 ,其中国家一级保护植物 4种 ,国家二级保护植物 6种 ,国家三级保护植物 8种。

Floristic analysis on seed plants of Meigu Dafengding national nature reserve

Meigu Dafengding national nature reserve is located in northeast Meigu county,Sichuan Province,and between 102°58′～103°20′ E,28°32′～28°50′ N. There are 860 species of seed plants,belonging to 118 families and 385 genera,among which gymnosperms have 5 families,16 genera and 19 species,and angiosperms have 113 families,369 genera and 841 species. The floristic elements of genera and species are composed of 13 types of Chinese seed plants. The temperate distribution elements,having 181 genera,accounting for 51.58% in total genera,hold a dominant position. The element of endemic species to China has 11 genera,accounting for 3.13% in total genera,and 410 species,accounting for 48.41% in total species,are endemic to China. Moreover,there are 18 rare and endangered plants in the reserve,among which 4 species belong to national protection categories 1(NPC1),6 species belong to NPC2, and the other 8 species belong to NPC3.