雅江格西沟自然保护区植被数量分类与排序

Quantitative Classification and Ordination Analysis of Vegetation in Gexigou Nature Reserve,Yajiang

根据群落调查的结果,对雅江格西沟自然保护区森林群落、灌木群落和草本群落分别进行了双向种指示法(TWINSPAN)分类和除趋势对应分析(DCA)排序,结合实际将保护区植被分为21个类型.利用DCA排序探讨了群落分布与环境因子的关系,发现水份是影响保护区群落分布最主要的因素.不同海拔梯度的植被组成各异,表现出明显的垂直地带性.坡向对群落分布影响较大,同海拔阴坡、阳坡植被差异较大,表现出几种群落类型的镶嵌分布.

A community survey of Gexigou Nature Reserve in Yajiang was performed.Two-way indicator species analysis（TWINSPAN） and Detrended Correspondence Analysis（DCA）was respectively used to forest communities,shrub communities,and herbage communities.The vegetation of Nature Reserve was classified into twenty-one vegetation assemblages.The result of DCA reflected the relationship between environment gradient and distribution of communities.Water gradient was the leading factor for distribution of vegetation.Communities were different in different altitudinal gradient;there was clearly vertical zone in Nature Reserve.Aspect also was one factor which effected distribution of communities.Different communities scattered in the same altitudinal gradient because of different aspect,showing mosaic pattern.