干扰、物种多样性、植物功能性状和功能多样性是生态系统资源经营和保护中的基本概念。随着植物群落演替，物种组成与森林结构的变化往往引起物种多样性、功能多样性与生态系统的功能的变化。一些研究表明功能多样性比传统的物种多样性更能响应生态系统的变化，但功能多样性随植物群落的不同环境因子和次生演替变化的研究仍较少。本项目以西双版纳典型的热带季雨林、沟谷雨林、山地雨林植物群落及其次生演替系列为研究对象，样方调查植物群落和测定环境特征，筛选对环境响应起关键作用的主要功能性状因子，并根据植物功能性状的不同组合来确定功能多样性,分析物种多样性和功能多样性随热带林典型的植物群落类型及其次生演替的变化规律，评价物种多样性是否可以预测功能多样性，分析热带天然林受到中度干扰后是否具有最高的功能多样性，最后以植物功能多样性为基础综合评价热带林生物多样性的维持机制。

Disturbance, species diversity, functional traits and functional diversity were the basic concept of ecosystem management and protection. With the succession of tropical forest, their species composition and forest structure often changed much, which then caused the change of species diversity, functional diversity and ecosystem. Some studies have showed that functional diversity than traditional species diversity can reflect the change of ecosystem, but the related studies on the change of functional diversity with environmental factors and succession were still very little. Baseing on the field investigations of the typical plant communities and their environmental factors of the ravine tropical monsoon forest, montane rain forest and their secondary succession in Xishuangbanna tropical forest, we measured the key functional traits, which can reflect the changeof environment and ecosystem, and computered the functional diversity by the different combinations of plant functional traits. We then analyzed the change of species diversity and functional diversity with the typical plant community types and their secondary succession; and evaluated whether species diversity was a good proxy for functional diversity;then analyzed whether the tropical forest had the highest functiona diversity after a moderate ditrbance; and finally evaluated the maintenance mechanism of tropical forest biodiversity basing on the functional diversity.