Vatica mangachapoi communities and Hopea exalata communities are two types of unique tropical rain forests located in low-elevation areas in Hainan Island. The former is mainly distributed in Shimeiwan of Wanning Country and Maihao Town of Wenchang Country; the latter is mainly distributed in Ganzhaling Mountain of Sanya Country. In this study, the community distribution, habitat feature, community composition and structure, and the cause of community formation for the two types of communities were reviewed. Results showed that the species composition and community structure of Vatica mangachapoi communities were relatively simple, with no distinct tropical rainforest features; these communities were impacted by coastal soil conditions. Species composition in Hopea exalata communities were relatively rich, and the community structure was relatively complicated; these communities were derived from mixed rainforest, due to human disturbance. After the rigorous protection, such as establishments of the natural reserves, the unique biodiversity in the two forest communities will be well conserved, and the knowledge of the community characteristics will" contribute to coastal forest restoration in our country.%单优青梅群落和单优无翼坡垒群落是海南岛幸存的低海拔特色热带雨林,前者主要分布在万宁石梅湾和文昌迈号镇,后者主要分布在三亚甘什岭地区.本研究分析了2种群落的分布特点、生境特征、群落组成、群落结构及形成原因.结果表明:单优青梅林物种组成和群落结构相对简单,热带雨林特征不明显；该群落的形成与发展受沿海土壤性质的影响.单优无翼坡垒林物种相对丰富,群落结构复杂;该群落是混合雨林受人为干扰破坏后发育而来.通过建立保护区或保护小区,不仅能保护特殊森林生物多样性,而且能为未来沿海沙滩等低地森林恢复提供实物样板.
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