Abstract: Shorea chinensis forest distributing in Xishuangbanna, S Yunnan, is a forest type of the seasonal rain forest from northern edge of tropical zone of SE Asia. In comparison with various representative tropical rain forest communities, it is indicated that the forest has the same community profile as lowland tropical rain forests, the similar life form spectrum, leaf scale spectrum and leaf type and texture composition to equatorial rain forests, as well as al-most the same species diversity, frequency of the tree D. B. H. class and relationship between individuals / species as typical tropical rain forests.

Key words: Shorea chinensis forest

摘要： 西双版纳望天树林是一种在水分、热量和海拔上均达到了极限条件的热带北缘季节雨林群落。该群落具有低地热带雨林的垂直结构，接近赤道雨林的生活型谱、叶级谱及叶型和叶质特征，亦具有与典型热带雨林相当的物种丰富度、乔木径级分布及个体/种关系，但在上层乔木中具有一定比例的落叶树种存在，大高位芽植物和附生植物较逊色而藤本植物和中、小高位芽植物较丰富，在叶级谱上小叶比例亦较高。这些特点又有别于赤道地区的湿润热带雨林。望天树林也以其热带季节雨林的性质和特点而不同于中国热带北缘地区的各种热带山地雨林和南亚热带季风常绿阔叶林。在中国植被分类系统中，它是一种最接近湿润雨林的季节雨林，是东南亚热带雨林的一种北缘类型。

关键词: 望天树林, 季节雨林, 群落学特征, 植被