海南岛亚地带界线划分的探讨

海南岛虽然是热带区域，但内部自然条件的差异仍比较明显，就南北差异可把全岛划分成南部热带和北部热带两部分，已有学者尝试着划分出亚地带的分界线. 龙脑香林作为亚洲热带林的标志，在海南主要分布于东南部. 龙脑香科植物为海南的地带性植被类型——热带常绿季雨林优势类群. 通过分析龙脑香林的分布与生态学特性，并参考了植物地理区划的原则，笔者尝试重新界定海南亚地带分界线. 

On the subzone demarcation in Hainan Island.

Obvious differences exist between southern and northern natural conditions of Hainan Island which lies in the tropical area and can be divided into two parts: the southern tropics and the northern tropics. Some scientists also attempted to draw subzone demarcation. Dipterocarpaceae forest, as a sign of tropical forest in Asia, is distributed mainly in southeast of Hainan Island. In addition, plants of Dipterocarpaceae are dominant in tropic evergreen monsoon forest and belong to a zonal vegetation type of Hainan. The authors evaluated the demarcation line on the basis of the distribution of typical forests, Dipterocarpaceae forests, and draw a new line that across from Changjiang through Baisha and Qiongzhong to Wanling. The ecology and geographical distribution of Dipterocarpaceae forests are described.