喀斯特山区城镇边缘带界定及特征研究

针对城镇边缘带在空间上存在动态的不确定性问题,该文提出以边缘带土地利用特征(主要指标为建设用地土地利用率与垦殖率)为基础的边缘带相对静态定界体系。采用ArcGIS Python实现体系中的自然断点分类法和空间筛选法,对特定时间节点的喀斯特山区城镇边缘带分布格局进行自动识别。从统计学、景观学探讨静态定界体系中网格参数设置,并从GIS统计分析山区城镇边缘带分布特征。研究表明:研究区域内边缘带约80%面积分布在0~15°坡度带;它与到核心区距离中度相关;山体和河道分布对城镇空间发展的连续性有影响;在交通网络影响下,地貌对边缘带界限的影响减弱,部分边缘带没有与城镇核心区相邻。因此,喀斯特山区小城镇边缘带分布在受地块与核心区之间距离、地形地貌、交通网络空间分布综合影响下,呈"飞地"分布。

Research on demarcation and distribution features of fringe area of the town in Karst mountainous area

According to the fact that urban fringe has not been defined clearly.This paper established relative and static bound system.With land utilization of construction land and the cultivated as the target,the spatial breakpoint of bound was classified and filtered using natural breaks classification.The characteristics of fringe area was got using ArcGIS Python realized the system and using GIS analysis in the karst town.The research showed that:about 80％ areas distributed in 0°-15° slope belt of the study area,which was associated with moderate to the core distance,and the mountain and river distribution affected the continuity of urban development;the traffic network,the effect of landscape was abated,the distribution of part of the edge has not neighbored to core area;therefore,a part of fringe was enclave which cased by the combined impact of distance between the core of the city,landform and the transport network.