小良热带人工窿缘桉林群落结构分析

COMMUNITY ANALYSIS OF TROPICAL ARTIFICAL EUCALYPTUS EXERTA FOREST IN XIAOLIANG, GUANGDONG, CHINA

本文分析了广东小良24龄的人工窿缘桉林的群落结构。结果表明:该群落种类简单,以矮高位芽植物和大型叶植物为主,但建群种窿缘桉不属此列,反映了其生境差的特点;乔木层植物的密度虽小,但叶面积指数大。灌木、草本层植物密度较大,却无窿缘桉幼苗;组成结构分析表明群落的乔木层结构向着简单化或稳定方向发展,而灌木层和草本层向着复杂的方向发展;该群落总的生物量为217.7t/hm^2,其中树干的积累量最大,生产上可以林分改造组建混交林。

Some aspects of a 24 -year - old Eucalyptus exerta community, one of the main artifical forests in tropical zone of China, have been studied. The .floristic components of the community are simple, the constructive species is Eucalyptus exerta;The community is dominated by the Narophytes and Macro - leaf plants,which indicates that the habitates of the community is adverse; The density of arbor layer is greater than that of shrub and herb layer,the Eu- calyptus exerta seedling was not found in the shrub and herb layer; The biomass of the community is 217. 7 t/hm2, in which the stem biomass is the main part;In addition,the analysis of species diversity index,evenness and ecological dominance index means that the structure of arbor layer tends to steady and the structure of shrub and herb layer tends to compicated.