西双版纳季风常绿阔叶林植物区系初步分析

基于西双版纳地区季风常绿阔叶林的植被调查资料,统计西双版纳季风常绿阔叶林种子植物区系组成,记录有种子植物95科223属351种(包括变种和亚种)。种子植物科的分布区类型中以泛热带分布科最多,达41个,占总科数的43.16%。属的分布类型中,热带分布属共计187个,占总属数的83.86%。在热带分布属中,又以泛热带分布属最多,达61个,占总属数的27.35%;其次为热带亚洲分布属,计有47个,占总属数的21.08%。种的分布类型中,各类热带分布的种最多,占总种数的70.37%,其中又以热带亚洲成分占优势。分布区类型的分析表明西双版纳季风常绿阔叶林种子植物区系具热带亚洲植物区系的特点,属马来西亚植物区系的一部分。进一步分析表明此区系具热带北缘的性质,但同时也呈现出向亚热带植物区系的过渡。

Study on the flora of the seed plants in monsoon evergreen broad-leaved forest of Xishuangbanna

The flora of the seed plants in monsoonal evergreen broad-leaved forest of Xishuangbanna is studied based on 1 hm2 cumulative sampling plots. 95 families,223 genera and 351 species of seed plants were recorded. There are 41 families of pantropical distribution,which make up 43.16% of the total families. The genera of tropical distribution make up 83.86% of the total genera. The species of tropical and its sub-patterns contribute to 70.37% of the total species,and the ones of tropical Asia distribution are predominant. These results revealed that this flora is obviously tropical Asian attributition,and a part of Malaysian flora. Occurred at the northern margin of tropical Southeast Asia,the forest flora also shows characters of marginal tropics.