荔波水族地区植物群落灌草层数量分类与排序

Quantitative Classification and Ordinatio of Shrub-grass Layers of Plant Communities in the Shui Nationality Areas of Libo

为研究荔波水族地区植物群落灌草层分布格局与环境因子间的相互关系,选取26个样地进行植被调查分析并记录了相关的6个环境因子数据,采用双向指示种(TWINSPAN)数量分类、除趋势对应分析(DCA)和典范对应分析(CCA)方法,分析植物分布与环境因子的关系。结果表明:物种累积曲线显示26个样地抽样充分;TWINSPAN方法将荔波水族地区植物群落灌草层划分为5种类型;样地的DCA排序图很好地反映TWINSPAN分类产生的5个主要群丛;CCA排序表明:影响荔波水族地区植物群落灌草层分布的主要环境因子是坡向和海拔。

To study the relationship between the distribution pattern of shrub-grass layers of plant communities and environmental factors in shui nationality areas of Libo,26 plots were selected and 6 environmental factors were recorded.The relationship between plant distribution and environmental factors was analyzed by using the methods of two-way indicator species(TWINSPAN),detrended correspondence analysis(DCA)and canonical correspondence analysis(CCA).The results showed that the species accumulation curve indicated that samples from the 26 plots were statistically sufficient;Shrub-grass layers of plant communities within the study area were classified into 5 types by the TWINSPAN classification;The results of DCA clearly reflected the distribution range of various community types,and CCA ordination results showed that slope direction and altitude were the most important environmental factors for plant species distribution of the shrub-grass layers of the plant communities in the shui nationality regions of Libo.