土地利用动态变化的空间分析测算模型

A spatial analysis model for measuring the rate of land use change

论文首先从土地利用变化的空间涵义出发,细分出未变化部分、转移部分和新增部分等3种空间类型,并据此对现有测算土地利用变化速率的数量分析和动态度模型进行了评析,提出了修正后的空间分析测算模型,旨在更为精细和准确地测算各土地利用类型的动态变化程度;并以北京城市边缘区的土地利用变化作为案例,对3种模型的测算结果进行了比较分析。结果表明:空间分析测算模型由于细分并同时考虑了各土地利用类型的空间转移及新增过程,能更为准确地测算出各种土地利用类型的动态变化程度与速率。

Through subdividing the spatial changes of each land use type into three categories of components,i.e.,the unchanged part,the converted part and the newly-increased part,this paper finds out that the two existing models for measuring the rate of land use changes have serious limitations.The traditional quantity analysis model only considers the quantitative change of land use but completely neglects the spatial changes of land use.The GIS-based dynamic degree model would seriously underestimate the change rate of those land use with rapid growth,in par-ticular urban land use because it only takes the conversion process into account but neglects the spatial expansion process of land use change.Therefore,a new spatial analysis model is then pro-posed to modify those limitations and to improve the measuring precision.Secondly,the proposed spatial analysis model is applied in a detailed case study on land use change in urban fringe of Beijing and the measuring results from the3models are compared which substantially demon-strate that the proposed spatial analysis model can more precisely measure the dynamic change rate of land use.