基于分形理论的城市空间结构及其影响因素研究——以贵阳市为例

Study on Urban Spatial Structure and Its Influencing Factors Based on Fractal Theory:A Case Study of Guiyang City

以贵阳市为研究区,以2010、2020年各土地利用类型数据为基础,采用分形理论探究贵阳市土地利用的变化速度和幅度,并分析贵阳市土地空间结构变化的驱动因素。结果表明:(1)贵阳市主要以耕地和林地为主,研究期间耕地、林地、草地等农业用地面积下降,建设用地和水体面积增加显著。(2)研究期间贵阳市各地类分形维数相差较大,整体边界维数呈上升趋势,形态维数下降,说明城市空间结构不规则性增加,城市土地利用复杂化,紧凑性降低。(3)贵阳市土地利用类型的变化是自然、人为因素共同导致的,尤其是经济与政策的影响。

Taking Guiyang City as the research area,based on the data of various land use types in 2010 and 2020,the fractal theory was used to explore the speed and range of land use change in Guiyang city,and the driving factors of land spatial structure change in Guiyang city were analyzed.The results showed that:(1)Guiyang was predominantly comprised of cultivated land and forest land.Throughout the study period,there was a decrease in the area of agricultural land such as cultivated land,forest land,and grassland,while there was a significant increase in the area of construction land and water bodies.(2)During the study period,different parts of Guiyang city exhibited substantial variations in class fractal dimension.The overall boundary dimension displayed an upward trend while the form dimension declined.These findings indicated that urban spatial structure had become more irregular,resulting in complex urban land use patterns and decreased compactness.(3)The change in land use type within Guiyang city could be attributed to both natural factors as well as human influences,particularly economic factors and policies.