基于县域尺度的江苏省乡村性空间格局演变及其机理研究

基于区域城乡一体的思想构建乡村性指数RI,通过GIS-ESDA空间分析框架,运用空间自相关、空间变差函数等测度模型对20世纪90年代以来县域尺度江苏省乡村性空间格局演变和机理进行了研究。结果表明:1990年以来县域尺度江苏省乡村性表现出较强的空间自相关性,相似地区在空间聚集分布,且集聚的程度不断增强;乡村性热点区空间结构主要以徐州-宿迁-淮安为核心的圈层结构,并且不断向盐城集聚,呈现出明显的地理集中演变特征;县域尺度乡村性空间格局的连续性和自组织性越来越强,由空间自相关引起的结构化分异的机理越来越显著;东北-西南方向乡村性空间差异较小,东南-西北方向乡村性的异质性则十分明显,空间差异较大。

EVOLVEMENT AND MECHANISM OF SPATIAL PATTERN OF RURALITY IN JIANGSU PROVINCE ON COUNTY SCALE

At present, rural and unban development are experiencing a transition period, from society, economy, culture and settlement spatial, rural become to urban transformation, meanwhile, different regions of the rural by urbanization influence degree differ, the area of rurality also showed significant differences. Every region can be regarded as a unity of urbanity and rurality, based on it, taked unban as criteria of reference to construct rurality index, and maked use of ESDA-GIS frame, by using spatial metric model such as spatial correlation index and semivarigram, the paper analyzed the spatial pattern and mechanism of rurality at county level in Jiangsu since the 1990s. The results show that: 1)Considering the overall spatial rurality framework, the county rurality of Jiangsu province showed a strong trend of spatial natural correlation, the similar areas cluster in space; 2)The spatial structure of hot-spot distribution tends to have a circular spatial structure centered on Xuzhou-Suqian-Huaian, and the hotspots have been remarkably increased after 2005, converging to Yancheng; there exists an obvious appearance of geographical concentration characteristic of spatial evolution according to the analysis of high-value clusters; 3)According to the space-time mechanism, the Jiangsu spatial rurality framework tends to be more continuous and self-organized, the random of the spatial differential pattern keeps decreasing and the mechanism of the structural differentiation caused by natural correlation in space is becoming more and more remarkable.