基于夜间灯光数据的中国五大区域级城市群空间扩张协同性对比

研究目的:梳理中国五大区域级城市群近20年间空间扩张的过程和规律,进而对比五大区域级城市群在空间扩张协同性上的差异。研究方法:通过对DMSP/OLS与NPP-VIIRS两种夜间灯光数据的融合,分析研究区1998—2017年空间扩张动态变化,在对其扩张速度、质量和内部关联测算的基础上,对比2003年、2008年、2013年、2017年4个时点空间扩张的协同水平。研究结果:(1)五大区域级城市群空间扩张的协同性整体上升,但群间差异大;(2)城市数量少的中小规模城市群空间扩张协同性更高;(3)中小规模城市群中,双核心城市群比单核心城市群在协同发展上更具优势。研究结论:中国区域级城市群的发展应根据城市群的不同类型制定相应的发展战略,在规划上促进土地的联合开发利用,增强用地空间增长的协同性,进而实现城市群整体有序发展。

Comparison of the Spatial Expansion Synergy in Five Regional Urban Agglomerations in China Based on the Night Lighting Data

The purpose of this paper is to sort out the process and rules of spatial expansion of five regional urban agglomerations in recent 20 years, and to further compare the differences in the spatial expansion synergy in regional-level urban agglomerations. The method of this paper is to analyze the integration of DMSP/OLS and NPP-VIIRS night lighting data in the study area from 1998 to 2017, and to compare the level of spatial expansion synergy in five regional urban agglomerations in 2003, 2008, 2013 and 2017, based on the measurement of the dynamic changes of urban spatial expansion, the speed and quality of urban spatial expansion and the internal connection of five urban agglomerations. The result shows that: 1)the synergy level of spatial expansion of five regional urban agglomerations in China all increased, but there was a notable difference among the groups. 2)The synergy level of spatial expansion in small or medium-sized urban agglomerations was higher than large ones; 3)In the small or medium-sized urban agglomerations, the dual-core urban agglomerations had more advantages in the synergy development than the single-core ones. In conclusion, the development of regional urban agglomerations in China should formulate corresponding strategies according to the different types of urban agglomerations, promote the joint development and utilization in land planning, and enhance the synergy in space growth, to promote rational development of urban agglomerations.