CCA, DCCA. The results are as following: plant communities are classified into 12 types by TWINSPAN, and they reflect changes of two environmental gradients, time of succession and water conditions of soil.

• 结果如下：用TWINSPAN进行的数量分类，共划分出12个群落类型，分类矩阵图明显反映出演替时间与土壤含水量两个环境梯度。