生态科学2018，Vol.37Issue(3)：51-58,8.DOI:10.14108/j.cnki.1008-8873.2018.03.007
西藏色季拉山川滇高山栎群落生态位特征
Niche characteristics of Quercus aquifolioides community on the Sejila mountains, Tibet, China
摘要
Abstract
Understanding the mechanisms including "niche differentiation and overlap" behind community assembly plays an important role in predicting community dynamic and protecting local biodiversity. Due to geographical and traffic restrictions, forest communities on the southeastern Tibetan Plateau are relatively less disturbed by human activities, resulting in a natural laboratory for theoretical research on community ecology. Based on field investigation and utilized importance value of plant species as indicator of resource status, the niche breadth and overlap of 49 main plant species in community of Quercus aquifolioides on the Sejila Mountains was studied using Levins, Shannon-Wiener and Horn indices. The results showed that (1) Q.aquifolioides, Lonicera microphylla, and Drynaria sinica had the largest niche breadths in the tree, shrub, and herb layers, respectively, in the Q.aquifolioides community on the Sejila Mountains;(2) the niche overlap within forest layers showed as herb layer＞ shrub layer ＞ tree layer;(3) the niche overlap between species from different layers showed as the values between shrub and herb ＞ between tree and shrub＞ between tree and herb;(4) as a pioneer tree species, Q. aquifolioides and its community played important roles in soil and water conservation and desertification control on the southeastern Tibetan plateau. In the community of Q.aquifolioides, coexistence of species inter-and intra-levels was promoted by the niche overlap on the sunlight and spatial resource between various species. This result demonstrated that the niche differentiation caused by niche overlap was one of the important mechanisms in the coexistence of biodiversity of Q. aquifolioides community on the southeastern Tibetan plateau. In the community of Q. aquifolioides;the inter- and intra-levels species coexistence was promoted by the niche overlap on the sunlight and spatial resource between various species. This result demonstrated that the niche differentiation caused by strong environmental filtering in alpine regions and the niche overlap between species with similar habitat requirements were the important mechanisms in the coexistence of biodiversity of Q.aquifolioides community on the southeastern Tibetan plateau.关键词
藏东南/群落构建/生物多样性/川滇高山栎群落/生态位宽度/生态位重叠Key words
southeastern Tibet/community assembly/biodiversity/Quercus aquifolioides community/niche breadth/niche overlap分类
农业科技引用本文复制引用
尼玛曲珍,张玺,谭坤,鲁闯,王国严,徐阿生,罗建..西藏色季拉山川滇高山栎群落生态位特征[J].生态科学,2018,37(3):51-58,8.基金项目
国家自然科学基金项目(31560153 （）
31260147) （）
西藏林芝高山森林生态系统定位研究项目 （）
