南岭国家级自然保护区森林群落的数量分类与排序

Quantitative Classification and Ordination of Forest Communities in Nanling National Nature Reserve

在广东南岭国家级自然保护区海拔300～1 900 m的范围内，海拔每升高100 m设置1条水平样带，共计调查了17条样带，样地面积20 400 m^2， 运用双向指示种分析（TWINSPAN）和非度量的多维标定法（NMMDS）进行森林群落的数量分类与排序.结果表明：（1）双向指示种分析，按照海拔从低到高组合，将南岭国家级自然保护区森林群落分为3种森林群落类型，聚类结果基本反映出广东南岭国家级自然保护区森林群落沿海拔梯度的分布；（2）非度量的多维标定法排序进一步验证了海拔是影响广东南岭国家级自然保护区森林群落的主要环境因子；（3）双向指示种分析结果与非度量的多维标定法结果基本一致，具有良好的可比性.

Forest communities in Nanling National Nature Reserve, Guangdong Province, were investigated using quantitative classification and ordination methods. A horizontal transect （10 m × 120 m） was placed at each 100-m altitudinal interval from an elevation of 300 m up to 1 900 m a. s. l. in the study area. Two-way indicator species analysis （TWINSPAN） and non-metric multidimensional scaling （NMMDS） were used to detect patterns of forest communities and its environmental correlates. The resuits were as follows： 1 ） Seventeen transects could be divided into 3 groups by TWINSPAN, representing the altitudinal gradients in the forest communities of Nanling National Nature Reserve; 2） Non-metric multidimensional scaling verified the assumption that elevation was the most important environmental factor influencing the distribution of forest communities ; 3 ） The results of TWINSPAN were corresponding to those of non-metric multidimensional scaling, having good comparability.