城乡过渡带空间演进与空间交互强度分析

采用NPP/VIIRS夜间灯光数据提取广州市城乡过渡带边界，利用基于sDNA模型修正的引力模型测算2012—2019年广州市城乡过渡带的空间交互强度，分析其空间演进特征与社会经济发展的关系。研究表明：1）2012—2019年广州市城乡过渡带总体呈扩大趋势，以北偏东方向发展为主，破碎区块逐渐演变为连续区域；2）广州市城乡过渡带之间的空间交互网络结构呈现“多方向化”趋势，从最初的西南侧单线网络结构逐步发育成多方向闭合网络联结结构，目前演变为南北两支、东西向的强空间交互态势，以白云区为代表的北部区域和以番禺区为代表的南部区域是广州市城乡过渡带的重要战略节点地域；3）广州市城乡过渡带社会经济优势度呈现出由内向外的3个空间层级结构，并由城市核心区辐射带动，向北、东北与东南3个方向推动发展为城乡过渡带；4）各城乡过渡带的发展速度不均衡现象仍较明显，广州市应结合本区域优势产业和自然资源，走联合与互补发展并存的道路，重视城乡过渡带区域发展引擎，增强其与周边地区联系的潜力。

Spatial Evolution and Spatial Interaction Intensity of Urban Rural Transitional Zone:A Case Study of Guangzhou

The urban-rural transition zone has obvious characteristics such as urban expansion transition,dynamic spatial structure,and a diversified human environment.It is of great significance to study the spatial interaction intensity between urban and rural transition zones.It will strengthen the cohesion of the Urban-Rural Transition Zone,promote the circulation of various elements between cities and villages,and improve the regional development capacity and competitiveness of urban and rural areas.There exists research on the change of urban spatial characteristics,the expansion of the urban outer circle,and its motive force.However,little research has been conducted on the spatial interaction and cohesion of the Urban-Rural Transition Zone.This is not helpful in coordinating the internal competition relationship between urban and rural areas,nor is it conducive to regional integration and high-quality development.Therefore,it is important to explore and analyze the spatial interaction that could form the foundation of urban and rural network cohesion.In this study,the light intensity of night light data in 2012,2015,and 2019 was used to extract the inner boundary of the Urban-Rural Transition Zone.The light fluctuation was calculated to extract the outer boundary of the Urban-Rural Transition Zone,and the threshold value of light intensity.Light fluctuation of each phase was adjusted constantly to fit the intensity of land-use development activities in the same period.Based on existing gravity model modification ideas,this study used the proximity and traversal parameters of the improved spatial syntax sDNA model as the influence coefficient to modify the traditional gravity model.It integrated the spatial structure,road network morphology,and human activities into the influence coefficient.Further,it used night light intensity to characterize the quality of urban and rural areas and measured the Urban-Rural Transition of Guangzhou from 2012 to 2019.Finally,the study analyzed the relationship between the spatial evolution characteristics and social and economic development.The results are three-fold.First,the Urban-Rural Transition Zone in Guangzhou had a significant effect on spatial evolution-the influence of the central city spread outwards,and the rural construction effect was obvious.The Urban-Rural Transition Zone area expanded by 291.26 km~2 from 2012 to 2019.The small patch area was further integrated into a baseband area,and the spatial form continuity of the transition zone was enhanced.In the direction of expansion,the urban-rural transition zone generally extended from north to east,and the transition zone boundary of Conghua zone and Zengcheng district was greatly promoted.The driving force of the Urban-Rural Transition Zone Development in each region was mainly due to the growth of investment in the development of secondary and tertiary industries and real estate.Second,the interaction intensity of the UrbanRural Transition Zone in Guangzhou showed heterogeneity in space,from large to small distribution from the inside to the outside of the transition zone.The spatial interaction network structure between urban and rural transition zones presented the characteristics of"multi direction."From the beginning,the single line network structure of the southwest had gradually developed into a multi-directional closed network connection structure.Today,the overall northeast area has been gradually developed.This multi-directional evolution is due to the improvement of people’s quality of life,more convenient transportation,and continuous improvement of urban and rural land use space in the Urban-Rural Transition Zone.In terms of the total intensity of spatial interaction in the Urban-Rural Transition Zone,the northern region,represented by the Baiyun District,and the southern region,represented by the Panyu District,have higher influence and attraction.The Panyu-Baiyun spatial interaction dual-energy pole has significant characteristics,which is an important strategic node of the Guangzhou UrbanRural Transition Zone.Third,the social and economic superiority of the Urban-Rural Transition Zone in Guangzhou is represented by three spatial hierarchies,which are driven by the radiation of the core area of the city and have developed into the Urban-Rural Transition Zone in the north,northeast,and southeast.Except for Yuexiu,Liwan,Haizhu,and Tianhe,with high urbanization rates,the unbalanced development speed of the Urban-Rural Transition Zone in other regions is obvious.Therefore,to improve the comprehensive development capacity of urban and rural areas and strengthen the cohesion of the network,each urban-rural transition zone should take the road of co-existence of joint and complementary development,attach importance to the regional development engine of the Urban-Rural Transition Zone,and enhance its potential of connecting with surrounding areas.