西藏色季拉山森林优势种群的生态位评价

Appraisal on the niche of forest dominant population of Sejila Mountain, Tibet

基于对西藏色季拉山原始林区分布的6种优势种群进行的生态调查,对其生长的海拔、坡度、坡向、坡位、土壤厚度5个空间因子进行统计,计算出不同优势种群在各空间资源上的生态位宽度以及平均权重,以此来对该区域的森林资源进行分析评价。结果表明:色季拉山原始森林主要优势种群的生态位宽度从大到小的排序为:急尖长苞冷杉、高山松、林芝云杉、高山栎、方枝柏、华山松。其生态位度量空间均表现较大的特点,说明各森林群落处于比较稳定阶段,相当于顶级群落。

This study investigates 6（main kinds of） dominant species on Sejila Mountain in the southeast of Tibet.Statistics are gathered from 5 space factors,such as altitude,slope gradient,slope aspect,slope position and soil depth.The niche breadths of each dominant population on various spatial resources as well as the average weight（s） are calculated.Analysis and appraisal of the forest resources in this region are carried out on this base.The results show that in the virgin forest of Sejila mountain in Tibet,the sorting decrease of the niche breadth of the（main） dominant population can be listed as： Abies georgei var,Pinus densata,Picea likiangensis var.linzhiensis,Quercus aquifolioides,Sabina saltuaria,Pinus armandi.The niche metric space displays the major characteristics,which indicates that the forestry community is at a quite stable stage and equals to a climax community.