岷江上游干旱河谷荒坡植物群落的β多样性分析

β Diversity of Plant Community of Barren Hillsides in Arid Valley of the Upper Minjiang River

岷江上游干旱河谷荒坡历来都是该地区植被恢复的重点区域,选择β多样性指数为指标分析其植物群落,能够为岷江上游干旱河谷荒坡的植被保护,特别是"5.12"汶川大地震破坏区域的植被恢复提供一定的理论依据和实践指导。分析表明,岷江上游干旱河谷荒坡植物群落的β多样性及其波动幅度较小,但总体而言随着海拔的增加而呈现减小的趋势;其植物群落生境梯度的变化是非均匀的,在物种组成和结构上差异均不明显但相对稳定。

The barren hillsides of arid valley in the upper Minjiang River are always the key region for vegetation rehabilitation of the area.Selecting β diversity as the index for analyzing plant community could provide a certain theoretical basis and practical guidance for vegetation protection of barren hillsides of the arid valley,especially the vegetation rehabilitation of the area where was destroyed by 'May 12,2008'Earthquake.The outcomes show that β diversity is very small and the variation range is smaller.In general,it decrease along with the increase of elevation.The variation of habitat gradient of plant community is inhomogeneous and the difference of composition and structure of species are not obvious but it is relatively stable.