山西芦芽山植物群落的数量分类

本文在群落样方调查基础上，采用双向指示种分析法（TWINSPAN）和除趋势对应分析（DCA）对山西芦芽山植物群落进行数量分类和排序。TWINSPAN等级分类将芦芽山82个样方分为28类，可归属于7个植被型，分类结果反映了植物群落类型与环境梯度之间的关系，并在 DCA二维排序图上得到较好的验证。DCA排序轴对角线基本反映了海拔、温度和湿度的梯度变化，表明群落生境所在地的海拔、温度和湿度是决定群落分布的主要因素。

Quantity Analysis of Plant Communities on Mountain Luya, Shanxi

Based on the survey of community plots, a quantitative analysis of the communities at Luya Mountain is performed with TWINSPAN (Two Way Indicator Species Analysis) and DCA (Detrended Correspondence Analysis) methods. 82 quadrates collected from Luya Mountains were classified into 28 types by TWINSPAN, which belong to seven vegetation types. The result of DCA indicated that those 28 types were reliable. Diagonal line of the two_dimensional ordination diagram of DCA reflects the gradient changes of elevation, temperature and humidity. It is considered that the major factors that restrict the community distribution of the mountains are eleva tion、temperature and humidity.