重庆地票交易时空特征及其与人口流动的耦合态势

从地票复垦生产和落地使用双边视角,采用区位基尼系数、热点分析、重心演变等方法探寻地票交易特征动态变化过程及其与人口流动的耦合态势。研究表明：（1）重庆主城区地票流入极功能弱化;渝西地区正成为新的地票流入极;渝东北、渝东南地区发展为以产出地票为主、兼具地票使用需求的复合区域。（2）渝东北、渝东南分别是地票复垦生产的主极核和次极核。渝西地区呈爆发式产出剧增。（3）地票流与人口流呈“偏离—一致—偏离”耦合态势。差异化的落地政策刺激了人口流出区地票使用积极性,造成地票流入偏离城镇人口流入轨迹;渝西地区受需求驱动大规模生产地票、渝东北和渝东南剩余农村闲置建设用地资源潜力有限,造成地票流出偏离乡村人口流出轨迹。

Spatio-temporal characteristics of land coupon trading and its coupling mechanism with urban-rural migration in Chongqing

From a bilateral perspective of land coupon reclamation and usage, this paper aims to analyze the spatio-temporal characteristics of land coupon trading and its coupling mechanism with urban-rural migration in Chongqing. Land coupon trading data and urban- rural migration data are analyzed with locational Gini index, hot spot analysis and gravity models. We found that: (1) The main urban areas of Chongqing are concentrated distribution area of gravity-center of land coupon usage, and also the place where hot spot areas are densely distributed. Land coupon usage in the main urban areas has experienced a process of increasing first and then decreasing. Spatial distribution of gravity-center of land coupon usages moved evidently northeastward. Land coupon usage in the western part of Chongqing has grown significantly. The northeast and northwest parts, which are the main output areas of land coupon, also have demand for the use of land coupon. (2) Northeastern and Northwestern Chongqing is the primary and secondary output areas of land coupon. There is an explosive output of land coupon in the western part during the study period. The equilibrium of land coupon usage and output showed a convergent trend of land coupon transaction. (3) We measured the overlapping of two centers of gravity and the consistency of their movement by model of the coupling mechanism, which illustrates that the spatio-temporal characteristics has a high correlation with the urban- rural migration. In general, the regions with high population urbanization level use more land coupon, and the regions with more urban-rural migration produce more land coupon. The differentiated landing policy stimulates the use of land coupon in the primary output areas, the demand-driven production in the western part and massive supply in the Northeastern and Southeastern Chongqing causing land coupon deviated from the urban-rural migration.