林芝地区乔灌层结构特征及其多样性研究

A Study of the structural characteristics and diversity of forest formations in the Linzhiregion

探究林芝地区典型森林群落乔灌层的物种组成、群落组成和物种多样性的变化规律。本研究选择分布在林芝市内的巴宜区、工布江达县、米林县、朗县以及波密县5县区19种典型森林群系为研究对象,对林芝地区主要森林群落乔灌层结构特征及其多样性开展了系统研究。研究结果表明:林芝地区森林群落乔灌层组成中灌木植物较为丰富,乔木组成相对简单。在调查的19个森林群系中出现了123种乔木和灌木物种,隶属于29科105属。经统计,其中蔷薇科、松科、忍冬科等耐旱优势科较多。整体来看,所调查的植物群系乔灌层D多样性指数变化范围在0.21~0.88之间,H多样性指数变化范围在0.27~3.89之间。不同的生境条件导致群系多样性层间结构存在差异。

In order to explore the changes of species composition,community composition and species diversity of tree and shrub layers in typical forest communities in Linzhi region.In this study,19 typical forest formations distributed in Bayi District,gongbujiangda County,Milin County,Lang County and Bomi County in Linzhi City were selected as the research objects,and the structural characteristics and diversity of main forest communities tree and shrub layers in Linzhi region were systematically studied.The results showed that the composition of forest community in Linzhi region was rich in shrub plants,and the composition of trees was relatively simple.123 species of trees and shrubs,belonging to 29 families and 105 genera,were found in the 19 forest formations surveyed.According to statistics,Rosaceae,Pinaceae,Caprifoliaceae and other drought tolerant dominant families are more.On the whole,the D diversity index of the tree and shrub layers formation ranges from 0.21 to 0.88,and the H diversity index ranges from 0.27 to3.89.Different habitat conditions led to differences in the inter layer structure of biome diversity.