海南昌江县石灰岩地区轮叶戟群落特征研究

Features of Lasiococca comberi var.pseudoverticillaita Communityin Limestone Areas in Changjiang, Hainan Island

根据样方调查,分析了海南岛昌江县石灰岩地区轮叶戟Lasiococcacomberivar.pseudoverticillata群落的种类组成、外貌和结构特征,并就分析结果与其它地区进行了相关性分析和讨论。结果表明,在1800m2样地中,有维管植物164种,隶属于64科129属,其中以热带性分布属占明显优势,所占比例为94.87%。群落外貌终年常绿,生活型以高位芽为主,占76.07%,乔木多为单叶,叶型以中型叶为主,占70.73%。群落成层现象不明显;通过对优势种群的年龄结构分析显示,该群落处于增长状态,按照Raunkiaer的频度等级定律,A级频度值为71.95,其中有79种植物只出现于一个样方中。通过相关性分析显示,该地植物在属的区系成分上受气候的影响比基质的大,该群落所属的植被类型处于热带常绿季雨林向热带雨林演替的过渡阶段,并需用自然恢复的方式对植被进行恢复和保护。

The phytocoenological characters of the Lasiococca comberi var.pseudoverticillata community in limestone areas in Changjiang county of Hainan Island were studied. Some relative analysis and discussion were also made. The results showed that 164 species in 129 genera and 64 families of vascular plants were found in 18 plots of 1 800 m^2, and most plants belonged to tropical genera (94.87% of the total). The physiognomy of the community was evergreen all the year round,and the life form in the community was dominated by phanerophytes, and the leaf form being dominated by plants with simple leaf and mesophylls for most trees(70\^73%).It is not easy to distinguish the vertical structure clearly.The analysis on age_structure of dominant populations showed that the populations of the community belong to increasing populations. The A_level frequency is 71\^95 by Raunkiaer's frequency law, and 79 species were found one time among the 18 plots.The studying on the relationship between the Lasiococca comberi var.pseudoverticillata community and others showed that it had a smaller effect for the limestone substrate than climate as for the areal types of genra. And the vegetation is in succession from tropical evergreen monsoon forest to tropical rain forest. Because of the excess disturbing by the local minority, the vegetation should be protected, and natural restoration is a good way for it.