基于多尺度的南京市城市用地分布空间决定因素

Urban Distribution and Its Spatial Determinants from a Multi-scale Perspective in Nanjing City

影响城市用地分布的因素目前尚无定论,在多种空间尺度上比较分析城市用地分布空间决定因素对于应对城市蔓延问题有一定现实意义。分析南京市2004~2016年城市用地扩张特征,继而在100 m×100 m、200 m×200 m、300 m×300 m、400 m×400 m、500 m×500 m 5个尺度上,比较分析城市用地分布潜在的空间决定因素。研究结果表明:2004~2016年间,南京市城市扩张速度和强度以2013年为界,呈先强势增长后缓慢扩张的态势;在选择的23个空间决定因素中,13个因素在多数尺度上通过了模型检验。其中,道路密度、GDP密度、公司工厂、生活服务设施对南京市城市用地分布的影响较大;其他决定因素对城市用地分布的影响程度表现出一定的尺度效应,在500 m×500 m较大尺度上,超市商场、汽车站、医疗则对城市用地分布的影响更大;而在100 m×100 m更精细尺度上,银行、学校、汽车站、超市商场对城市用地的分布有较大影响。研究结果可为城市规划及用地调控提供决策支持建议。

It remains unclear on how spatial determinants effect the urban distribution at different spatial scales,while such knowledge is crucial to address the urban sprawl issue more effectively.The characteristics of urban land expansion of Nanjing city from 2004 to 2016 were analyzed.On the five scales of 100 m×100 m,200 m×200 m,300 m×300 m,400 m×400 m and 500 m×500 m,the potential spatial determinants of urban land use distribution were analyzed.The results show that:(1)from 2004 to 2016,the speed and intensity of urban expansion was bounded by 2013,showing a trend of strong growth first and then slow expansion.(2)among the 23 chosen influencing factors,totally thirteen factors pass the model test at most scales.(3)road density,GDP density,company factory,and living service facility have a greater impact on the distribution of urban land in Nanjing.The effect of other factors on the distribution of urban land shows a certain scaling effect.On the larger scale of 500 m×500 m,shopping mall,bus station,and medical care show a greater impact on the distribution of urban land use;meanwhile,on the finer scale of 100 m×100 m,bank,school,bus station,and shopping mall have a greater influence.The research results might provide decision support suggestions for urban planning and land use regulation.