西藏色季拉山种子植物区系分析

Floral Analysis of Seed Plants in Sehgyla Mountains, Tibet

色季拉山有种子植物1391种,隶属于491属,103科。其中裸子植物3科,9属,16种;被子植物100科,482属,1375种。色季拉山种子植物属的区系成分以温带成分为主,达324属,占总属数的73 4%,在植物区系的组成中居重要位置。种的区系成分以中国特有种占比例最大(573种,占总种数的41 49%),它们多是构成色季拉山优势植被类型的建群种和优势种的主要成分。类平均聚类分析表明,色季拉山种子植物区系与纬度偏北的太白山、中条山、太行山和太岳山植物区系比较接近,与纬度相近的庐山、木林子、神农架等植物区系差异较大。

There are 1391 species of seed plants in Shergyla mountains, belonging to 491 genera and 103 families, including 3 families, 9 genera and 16 species of gymnosperms, 100 families, 482 genera and 1375 species of angiosperms. Temperate distribution is the dominant element, 324 genera, which accounting for 73.4 % of the total number of genera. Among the floristic element of species, the number of species endemic to China is 573, accounting for 41.49 % of the total species. Those species are the major elements of the constructive and dominant species of dominant vegetative types. The floristic elements of genera of seed plants of Shergyla mountains and other eleven floras are studied comparatively by group-average clustering respectively. The results shows that there is a high closed relationship between the floristic elements of Shergyla mountains and the higher altitude flora such as Taibai mountains, Zhongtiao mountains, Taihang mountains and Taiyue mountains, whereas it is significantly different from that of Lu mountains, Mulinzi and Shennongjia with the similar altitude.