多情景视角下基于空间组合识别的农村居民点布局优化研究——以江苏省新沂市为例

快速城镇化时期,探索农村居民点空间布局优化方案,有利于挖掘土地资源利用潜力,加快落实乡村振兴实践.本文以江苏省新沂市农村居民点为例,“自下而上”地从地理区位、村庄特征、生态本底和资源禀赋4个方面进行优化适宜性评价;基于一定耕作腹地范围内的空间竞合关系,对不同耕作半径下的优化适宜性评价结果进行二次迭代修正;并“自上而下”...

Rural settlements layout optimization based on spatial combination identification from a multi-scenario perspective: Taking Xinyi city of Jiangsu province as an example

With the rapid advancement of new urbanization, it is conductive to tap the potential of land resource utilization and promote rural revitalization practices while exploring reasonable solutions for the spatial layout optimization of rural settlements. Taking the rural settlements of Xinyi city in Jiangsu province as an example, first, we evaluated the optimal suitability from four aspects including geographical location, village characteristics, ecological background, and resource endowment based on “bottom-up appropriateness” principle. Second, considering the competition and cooperation relationship within a certain farming hinterland of rural settlements, we used the dynamic correction method of twice-iterative sequencing by computer to obtain the spatial layout scheme of rural settlements under different farming radii. Third, we used improved gravitational models and social network analysis methods to evaluate the radiation intensity of rural settlements under the dominance of regional functions based on “top-down domination” principle. Finally, we obtained a dynamic optimization scheme and management strategies with various kinds of rural settlements under different farming conditions. The results show that: (1) The optimal suitability of rural settlements is higher in the west and lower in the east of Xinyi city, and it presents an obvious spatial heterogeneity. The rural settlements with significant ecological background and resource endowment advantage tend to present spatial agglomeration development. (2) With the increase of tillage radii, the number of reserved rural settlements gradually decreases in an exponential way, and the spatial layout becomes more evenly dispersed after the twice-iterative operation. When the farming radius is 3 km, the retention rate of rural settlements is 35.10% lower than that of 0.5 km. (3) The interaction between rural settlements at the same level is less tight. More than 90% retained rural settlements present medium functional radiation intensity when the farming radii is 0.5 km to 2 km, while high-intensity nodes are scattered and mostly located at the township junction. The spatial optimization layout scheme of rural settlements based on the combined recognition from a multi-scenario perspective takes full consideration of “bottom-up appropriateness” and “top-town domination” perspectives. It combines optimization suitability evaluation, spatial cooperation and iterative evaluation, and regional function network evaluation to enrich the theoretical system of rural settlements and county-town layout research. It will also try to promote rural transformation, and establish a scientific paradigm for spatial optimization and reorganization.