Based on 3 field measured ecophysiological traits (Amax, gmax and SLA) which directly related to plant-atmosphere interactions, major plant species in the tropical montane rain forest on Hainan Island were aggregated into functional groups using hierarchical cluster analysis and NMS( non-metric multidimensional scaling). And the changes of functional group composition along the four successional stages (primary, early, middle, and late) was analyzed. The results showed that 87 major plant species in the tropical montane rain forest could be classified into 8 distinct functional groups ( with significant between group differences and high within-group homogeneity). The richness and relative aboundance of different functional groups varied significantly along the four successional stages, it was low in primary stage and became higher in the early stage while the peak appeared in middle stages, and then declined in late successional stage. The dominant functional groups in the primary stage has the highest Amax and lowest WUE, while dominant functional groups in early and middle successional stages has Amax and WUE of moderate level, and dominant functional groups in late successional stage has the lowest Amax and the highest WUE.%在海南尖峰岭热带山地雨林,野外测定获得3个与植物-大气相互作用直接相关的生理生态特性指标(最大净光合速率、最大气孔导度和比叶面积),应用等级聚类分析和NMS排序方法对热带山地雨林的主要植物进行功能群划分,分析热带山地雨林4个演替阶段(初期、早期、中期和后期)生理生态功能群组成及其动态规律.结果表明:海南尖峰岭热带山地雨林的87个主要植物种类可划分为8个功能群,检验结果显示功能群间存在显著差异,而功能群内同质性较高；功能群的丰富度及相对多度在不同演替阶段差异显著；功能群的丰富度在演替初期最低,演替早、中期最高,演替后期略有降低；演替初期的优势功能群光合能力强,水分利用效率低,演替早、中期的优势功能群光合能力、水分利用效率均为中等；演替后期的优势功能群光合能力偏低,水分利用效率高.
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