Abstract: The Pometia tomentosa forest in Dahei Mountain, Lixian River Watershed, southeastern Yunnan,is dominated by Pometia tomentosa and Saraca dives, and is charactered by evergreen megaphaenerophytes and mesophaenerophytes with simple ,chartaceous and entire mesophylls. With the conspicuous similarity on ecological and floristic characters to tropical rain forest of SE Asia, the forest in Dahei Mountain is considered as a type of tropical seasonal rain forest in the northern margin of tropical Asia. Furthermore, the distribution of trees in DBH class, the individual/ tree species relation and the frequency of tree species are enumerated.

Key words: Dahei Mountain, Lixian River watershed, Southeastern Yunnan

摘要： 滇东南绿春县李仙江大黑山番龙眼群落以无患子科的番龙眼和苏木科的无忧花为乔木层优势种，外貌以单叶、纸质、全缘、渐尖、中叶为主的常绿大、中高位芽植物组成为特征，层间木质藤本较丰富，属一种热带北缘的热带季节性雨林类型。该群落物种组成复杂，动态结构稳定，处于生长期。

关键词: 李仙江大黑山, 番龙眼群落, 热带季节性雨林