海南岛的热带杨树种群生态

THE ECOLOGY OF TROPICAL POPLAR SOCIATION IN HAINAN ISLAND

杨树林在世界上一般分布在热带至中亚热带,群落的组成和结构较简单。海南岛出现杨树林,是新的发现。本文从群体生态学上对该群落进行研究,发现它是多树种、多层次和以杨树为优势种的热带针阔混交林;其树种组成递属于12科、13属、16种,其中属热带的树种达13种,占81％,绝大部分树种为热带成分,而林分中琼岛杨这个种群的相对密度、相对优势度,相对频度和重要值均为全林之冠,南亚松次之,二者分别为群落的优势种和亚优势种,它们的林木个体高大通直,前者胸径达120cm,后者树高达38m,单株蓄积量均可达16～17m^3。本文研究结果可作为今后研究和建立热带杨树生态系统提供依据。

Generally;the distribution of the poplars in the world is from temperated zone to middle subtripical zone,their compositions are rather pure and their constructions are rather simple.The appearance of poplar forest in Hainan Island is a new discovery and a new distribtion in the world.This research is a synecology on that poplar association.The Result has been found that it is a multispecies,multi-layers,tropical coniferous and broad-leaved mixed forest which the dominant is poplar,that its species composition is belong to 12 family,13 genus,16 species which most are tropical essen tial,as 13 species are tropical(81%),and that in the forest the relative density,relative dominance,relative frequency and the importance value index of the Populus qiondaoensis sociation are the first,and of the pinus lateri sociation are the second.These two species are the dominant and the snb-dorninant of the association.They are tall and straight.The former is 120cm in b.h.d.and the latter is 38m in height.Their single tree volume can approach about 16-17m3.From the result of this study,it is recommended to research and develope the topical poplar ecosystem.