张掖市甘州区土地利用的时空结构分异研究

Study on Spatial Deviation Analysis Model of Land-use Change in Ganzhou

土地利用变化时空分异在很大程度上都反映于土地利用结构的时空分异,描述土地类型空间结构分异最常用的方法就是比较分析不同土地利用类型在空间方位上的差异。但考虑到此方法的一些缺陷,本文在上述方法的基础上,引入了年均变化强度指数指标来描述土地利用的时空结构分异特征。为了便于比较某一研究时期土地利用变化的强弱或趋势,可计算各空间单元的年均变化强度指数,它实质就是用各空间单元的土地面积来对其年均变化速度进行标准化处理,使其具有可比性,得出各不同用地类型的时空结构分异情况,对出现这种情况的原因进行综合分析评价,从而达到全面把握土地变化规律的目的。

Spatial - temporal deviation of land use structure reflects the spatial - temporal feature of land use change in a great degree. The mast common method describing the spatial structure deviation of land use types is the location divergence analysis for various land use types. In this paper, the above method is improved, and the Average Annual Change Intensity Index is induced to analyze the spatial - temporal deviation feature of land use structure. The Average Annual Change Intensity Index of each spatial unit is calculated with the average annual change speed divided by the land area. By the normalization, the land use change of each spatial unit becomes comparable and it is easier to compare the intensity or tendency of different land use types in the same study period. The spatial - temporal deviation status of various land use type is counted and described, and more over, its driven factors and causes are analyzed and evaluated comprehensively. At last, the target of comprehensive understanding the land use change discipline is achieved.