桂林岩溶石山青冈栎群落的数量分析

应用双向指示种分析(TWINSPAN)和除趋势对应分析(DCA)方法对桂林岩溶石山青冈栎群落进行数量分类与排序。通过TWINSPAN分类,将青冈栎群落60个样方划分为8个群丛类型,探讨了各群丛类型的基本特征。结果表明:DCA排序与TWINSPAN分类结果较一致,DCA排序较好地体现了各群丛类型与环境因子的相互关系,DCA第一排序轴主要反映了坡度的变化梯度;DCA排序图的对角线基本体现了坡向的变化梯度。坡度的变化是影响岩溶石山青冈栎群落物种组成与分布的重要生态因子。

Quantitative analysis of Cyclobalanopsis glauca community on Karst hills of Guilin

By using two-way indicator species analysis (TWINSPAN) and detrended correspondence analysis (DCA), the quantitative classification and ordination of Cyclobalanopsis glauca community on Karst hills of Guilin were conducted. Based on the results of TWINSPAN classification, 60 quadrats of C. glauca community were classified into 8 association types, with their community characteristics described. Both DCA ordination and TWINSPAN classification exhibited consistent results. DCA ordination preferably reflected the relationships between association types and environmental gradient: The first axis of DCA mainly reflected the gradient change of slope, and the diagonal line of the two-dimensional ordination diagram of DCA indicated the gradient change of aspect. The species composition and distribution of C. glauca community on Karst hills were mainly affected by the slope.