无锡半城市化地区的空间范围识别

半城市化地区是近年国内外城市地理研究的新焦点。半城市化地区处于城市、乡村的模糊界限之中,受城乡共同作用,具有显著的过渡性、动态性和不稳定等特征,是发展变化最大的区域,对经济社会发展空间的可持续性具有重要影响。目前,半城市化地区空间范围的确定以定性分析为主,缺乏定量分析的实证与理论研究,并且大部分拘泥于行政边界限制。本文在探讨半城市化地区内涵基础上,建立包含建设用地占比、景观紊乱度、人口密度和二三产业增加值四个指标的指标体系,以无锡市区为例,借助ArcGIS 软件运算分析指标在360 个方向上的距离衰减突变值(DDV),结合“断裂点”方法,界定出无锡半城市化地区的范围,为未来半城市化地区空间演变研究奠定基础。

Spatial definition of peri-urban areas in Wuxi

Peri-urban areas have become the focus of urban geographic studies at home and abroad in recent years. Peri-urban areas with distinctive characteristics such as being transitional, dynamic and unstable, have been the region changed most drastically and this grand change has significant influence on sustainability of economic and social development. At present, the existing researches used qualitative analysis to define peri-urban areas instead of quantitative empirical and theoretical analysis, and most of them are constrained by administrative boundaries. This paper, based on understanding of peri-urban areas, establishes an evaluation index system which contains construction land proportion, degree of landscape disturbance, population density and the secondary and tertiary sectors added value. Furthermore, taking Wuxi as an example, this paper analyzes the mutations of values in 360 directions with distance attenuation (DDV), and uses the "breakpoint" to identify the peri-urban areas in Wuxi. This research may lay a foundation for future space-evolutionary study on the peri-urban areas.