桂西南地区擎天树群落多样性研究

以桂西南地区那坡县百合乡和田阳县坤平乡的擎天树林为研究对象,从物种组成、物种优势度等特征分析广西擎天树林群落的分布规律。结果表明,桂西南地区那坡县百合乡和田阳县坤平乡的擎天树群落,以龙脑香科植物擎天树为乔木层优势种,大戟科植物秋枫为亚优势种,外貌以大、中高位芽植物组成为特征。在植物区系组成上,以大戟科、桑科、茜草科、紫金牛科、棕榈科、番荔枝科等为主要组成科;在重要值统计上,以大戟科、紫金牛科、桑科、梧桐科、茜草科、棕榈科等为优势科,与东南亚北热带雨林很接近,故为北热带季雨林的北缘类型。

Study on Diversity of Parashorea chinensis var.kwangsinensis Community in Southwest Guangxi

Taking Parashorea chinensis var.kwangsinensis forest in Baihe of Napo County and Kunping of Tianyang County,Southwest Guangxi as RESEARCH objects,based on the characteristics analysis of species components and species dominance,etc.,the distribution rule of Parashorea chinensis var.kwangsinensis community in Guangxi are analyzed.The results show that the Parashorea chinensis var.kwangsinensis forest in Baihe of Napo County and Kunping of Tianyang County,Southwest Guangxi,is dominated by Parashorea chinensis var.kwangsinensis(Dipterocarpaceae) and Bischofia javanica(Euphorbiaceae) and characterized by evergreen megaphanerophytes and mesophanerophytes.In floristic composition,the forest is dominated by the plant families Euphorbiaceae,Moraceae,Rubiaceae,Myrsinaceae,Arecaceae and Annonaceae in species richness,while Euphorbiaceae,Myrsinaceae,Moraceae,Sterculiaceae,Rubiaceae and Arecaceae in phytosociological importance.This suggests that the flora of the Parashorea chinensis var.kwangsinensis community is close to the North tropical rainforests in Southeast Asia.It is the northern marginal type of north tropical seasonal forest.