Abstract: The study of Dracontomelon macrocarpum community in Xishuangbanna is based on phytocoenology.Dracontomelon macrocarpum(Anacardiaceae) and Pometea tomentosa(Sapindaceae)are the upper dominant species of the community.The community are divided into A,B,C and D layer.The community is mainly charactered by evergreen megaphaenerophytes and mesophaenerophyteswith simple,characeous,entire,caudal mesophylls.There are many woody lianas and epiphytes in the layers.The biological diversity in the community is rich.It is the north extension of the tropical seasonal rain forest of Laos.The individual number of trees is few.The dynamic structure is stable is stable,the distribution area is limited,its ecosystem so fragil that cries out for urgent protection.

Key words: Xishuangbanna, Dracontomelon macrocarpum, Community, Phytocoenology

摘要： 应用植物群落学的研究方法，对西双版纳大果人面子群落进行了初步研究。该群落是以漆树科的大果人面子和无患子科的绒毛番龙眼为乔木上层优势树种，群落分A至D层，外貌以单叶、纸质、全缘、尾尖、中叶为主的常绿大、中高位芽植物组成为特征，层间木质藤本和附生植物丰富，属热带季节性雨林，但带有一定过渡性。该群落是老挝热带季节性雨林向北的伸延，物种丰富，乔木个体数少，动态结构稳定，但分布面积狭小，生态脆弱，需重点保护。

关键词: 西双版纳, 大果人面子群落, 植物群落学