基于地质统计学方法的土地利用空间变异尺度分析

基于遥感和GIS解译得到土地利用专题图,采用景观指数法和地质统计学法,分析云南省呈贡县2001年、2003年、2006年土地利用格局的空间变异特征与尺度的关系及其控制因素。研究区土地利用空间格局的变异性在多个尺度上存在,且具有等级结构特征:不同尺度对应不同的空间格局;不同等级尺度下的过程是空间格局产生变化的控制因素;不同等级尺度上的格局可相互转换。

Grain Analysis of Land Use Spatial Pattern Based on Geo-Statistic Method

In this paper,semi-variogram of shape index was used to disclose scale multiplicity and spatial correlation ability of land use spatial pattern,with a case study of Chenggong in Yunnan Province.To unveil these scaling rules,two experiments were put up.1) The first one was the spatial heterogeneity change analysis according to different spatial grains in 2001.First,the grains ranged from 5 to 150 m were divided into 3 hierarchies.Then different land use types were distributed to appropriate hierarchies.The values of ranges indicated different extension areas for different land use types.The analysis results were confirmed by land use classification results and remote sensing imagery.2) The second one is spatial pattern and process analysis with different hierarchical scales and different time periods.First,three representative scales from 3 different hierarchies were chosen,and different characteristics of structure were found according to different hierarchical scales.Then the values of ranges were compared from different time of the same hierarchy.The results indicate that correlations of land use spatial patterns exist in a wider spatial range as time goes by.The distribution of land use spatial pattern is controlled by different structure factors according to different hierarchical scales.The characteristic scales of a particular land use type can change from one hierarchy to another under certain circumstances.