海南尖峰岭国家级保护区青皮林资源与乔木层群落学特征

The Resource and Community Characteristics of Vatica mangachapoi Forest in Jianfengling National Nature Reserve,Hainan Island

三分区位于尖峰岭国家级自然保护区，目前区内有海南岛保存最好的青皮林。根据1．38hm^2的样地资料，林分平均蓄积量高达469．773m^3·hm^-2；平均胸径28．6cm，最大胸径143．3cm；林木组成复杂，记载种类300多种。青皮为热带常绿季雨林的表征种和建群种，重要值为16．8，该种群的径级和年龄结构合理，具有反J曲线的正常增长型种群。聚类分析结果表明：属于典型热带常绿季雨林类型的青皮林群落分布在海拔300，650m处，伴生树种有白茶、细子龙、野生荔枝等。调查区内有8种国家重点保护植物，其中坡垒为国家一级保护植物，青皮是关键种，该区的森林生态系统具有极高的保护价值。

With the total area of 381 hectares, the Vatica mangachapoi forest in Sanfenqu of Jianfengling National Nature Reserve is one of the best protected forests over the whole Hainan Island. Based on the sample plots data （ total plots area is 1.38 hectares）, there are more than 300 tree species recorded and the mean timber volume is 469.773 m3 ~ hm - 2, the mean diameter al breast height （DBH） of all trees is 28.6 cm and the maximum DBH is 143.3 cm; V. mangachapoi （Dipterocarpaceae） is the dominant and key stone species in the forest ecosystem, and the population density （DBH 12 cm） is 48 individuals per hectare and the population important value （Ⅳ） is 16.8 （the total Ⅳ of all populations is 300）. The population age structure of Ⅴ. mangachapol now presents as steady increasing population, the tree number is gradually decreasing with the tree DBH increasing. Based on the results of cluster analyse, the Ⅴ. rnangachapol forest belongs to the tropical monsoon forest and mainly distributes between 300 to 650 m above sea level. The sub-dominant species of V. mangachapoi forest are Koilodepas hainanensis, Amesiodendron chinensis and Litchi chinensis var. euspontanea. 8 national key protected species are recorded in Sanfenqu, Hopea hainanensis （Dipterocarpaceae） is the first grade of the national key protected species.