浑善达克沙地草地景观要素空间分布关系及其格局分析

Analysis of distribution relationship on landscape elements and their spatial patterns in the eastern otingdag sandland, inner mongolia

采用以2×2联列表为基础的X2检验、Ochiai指数和孔隙度指数,对浑善达克沙地中的沙丘、草本植被、榆树(Ulmuspumila)和风蚀坑的空间分布关系及格局进行了分析.X2检验结果显示榆树、沙丘、风蚀坑三者在分布上相互之间存在极显著的正关联关系,草本植被的分布分别与榆树、沙丘、风蚀坑的分布之间存在极其显著的负关联关系.这表明榆树对当地沙丘的形成和固定起主要作用.孔隙度分析结果表明,四种景观要素具有偏离随机适度聚集的空间格局.

Using the methods of X^2-test basing on 2×2 contingency tables, Ochiai indices and lacunarity indices, we analyzed spatial pattern of sand dunes, herbaceous vegetation, elm trees(Ulmus pumila) and aeolian pits in the Otingdag sandland, Inner Mongolia, and even their mutual relationships. The results showed that the distribution of herbaceous vegetation was observably negatively correlated with the distribution of sand dunes, elm trees and aeolian pits, respectively. That implied elm trees may play an important role on the accretion and fixation of sand dunes. While lacunarity analysis showed that spatial patterns of these four landscape elements were away from random and gathered moderately.