三江源自然保护区种子植物区系分析

Floristic Study on Sanjiangyuan National Nature Reserve

三江源自然保护区位于青海省南部,该区共有野生种子植物1639种,隶属70科、388属,分别占青海省总科数的70.0%、总属数的63.3%、总种数的54.9%。三江源自然保护区种子植物区系具有以下特点:(1)属级水平显示,三江源地区的植物区系以温带分布为主,北温带成分优势明显;在种级水平,以东亚成分占优势。(2)本区系的植物在种类上缺乏古老的、原始的类型。(3)绝大多数植物为多年生草本,灌木和乔木稀少;本区植被多为高寒类型,具有高寒区系的显著特色,植物区系的高山特化作用比较显著。

Sanjiangyuan National Nature Reserve is situated in the south of Qinghai, China. There are 1639 species of native seed plants which belong to 70 families and 388 genera in the area. They are 54.9 of the total species and 63.3% of the total genera, 70.0% of the total families in Qinghai, respectively. The floristic characteristics in native seed plants for the area are follows. （1）At generic level, the flora is temperate in nature, dominated by North Temperate elements especially; at species level, East Asia com- positions are dominant. （2）This flora is short of the ancient type and primitive species. （3）Most plants are perennial herbs and rare in woody. The main vegetation is typical alpine, and effect of alpine specialization on floristic formation is significant.