The figure of DCA ordination of axis 1 & axis 2, and axis 1, axis 2 & axis 4 reflected the ecological regulations between vegetation and sandy desertification.

• 第 4轴主要反映热量梯度 ; DCA的1、4轴排序图和 1、2、4轴排序图 ；反映沙地植被与沙质荒漠化的生态规律 .