江苏典型县域城乡聚落规模体系的演化路径及驱动机制

Evolution paths and the driving mechanism of the urban-rural scale system at the county level:Taking three counties of Jiangsu province as an example

新时代背景下,深入开展县域城乡聚落规模体系研究对促进城乡融合发展、推动乡村振兴战略的实施具有重要的理论意义和实践价值。本文从苏南、苏中、苏北选择张家港市、泰兴市、涟水县3个典型县市作为研究案例地,利用1995年和2015年遥感影像数据和土地利用数据,构建了县域城乡聚落规模体系的评价方法,对县域城乡聚落规模体系的时空演化过程进行了实证分析,发现不同类型县域城乡聚落规模体系的演化路径既有明显差异,也存在一般性路径,而且演化路径具有显著的城镇主导效应和集群分布效应。在深入分析经济发展、城镇化、交通网络、制度与管理4种主要影响因素基础上,进一步提炼出县域城乡聚落规模体系演化的"四轮"驱动机制。研究结果有助于深入认识城乡聚落有机整体的系统观,为推动城乡聚落优化重构提供了新的研究视角和方法支撑。

In the context of the new era,it is of great theoretical and practical significance to promote urban-rural integrated development and rural revitalization by exploring the evolution paths and the driving mechanism of the urban-rural scale system.In this paper,we examined the evolution paths and the driving mechanism of this system at the county level based on both the land change survey data and remote sensing data in 1995 and 2015,when taking three counties of Jiangsu province as an example,namely developed Zhangjiagang,moderatelydeveloped Taixing,and less-developed Lianshui at different levels of economic development. Based on the empirical study,in this paper,three typical evolution paths of the urban-rural scale system at the county level in Jiangsu province were summarized,and they fell into three types:Developed County,Moderately Developed County,and Less Developed County.In this case,some conclusions can be drawn as follows:(1)the number of settlements in the county decreased,but the total size increased;(2)the total size of rural settlements decreased,and the size of cities and towns increased at different speeds,when the town size gradually exceeded the urban size;(3)the number and the built-up area of high grade settlements increased,while those of low grade settlements decreased;(4)the polarization feature of the county's development became increasingly significant before gradually becoming weak;(5)the characteristics of the spatial cluster concerning the urban-rural scale system became increasingly significant,and the number of hot-points increased in the county area;(6)urban and rural construction land constantly expanded,when Chengguan town and key towns experienced the main change;(7)the spatial pattern of the urban-rural scale system evolved from the single center to double centers,and then to multi-centers.Furthermore,there were two common characteristics,namely urban-dominant effect and clumped-distributive effect,in the developing process of the urban-rural scale system in different counties.Then,based on the analysis of the key influencing factors,in this paper,the driving mechanism of the urban-rural scale system at the county level was put forward.In this study,economic growth,urbanization, transport network,and institutional management stand for four ways to propel progress.They are like the four wheels of a car,reinforcing and depending on one another and forming an integrated whole,in which the urban-rural settlement system constantly evolves.