多重因素下西南边疆地区中心城市空间可达性分析——以云南省为例

Spatial Accessibility of Central Cities in Southwest Frontier Region under Multiple Factors: A Case Study of Yunnan Province

基于边疆山区特殊地理环境条件及综合交通道路等多重因素,运用栅格分析、成本距离工具和划定等时圈等方法,更为精确地模拟了边疆山区省份云南省中心城市空间可达性水平.结果表明:(1)云南省中心城市空间可达性水平整体上呈东高西低和块状分布的空间格局.处于交通要道的地区空间可达性水平较高,高山密集地区空间可达性最弱,部分地区存在可达性“孤岛”;(2)0~3 h等时圈基本覆盖云南省所有地区,0~2 h等时圈基本实现地区的空间融合,1 h等时圈仅滇中城市群融合程度较高.最后,根据云南省中心城市空间可达性水平提出相应的政策建议.

In this study, the spatial accessibility of central cities in Yunnan province is simulated more accurately by taking into account the special geographical environment conditions and comprehensive traffic roads in the border mountainous areas, using grid analysis, cost distance tool and demarcation of isochronal circle.The results show that(1)the spatial accessibility of central cities in Yunnan province presents a block-shaped spatial pattern with high east and low west.The spatial accessibility level is higher in areas with major traffic routes, and the spatial accessibility is weakers in areas with dense mountains, and there are isolated islands in some areas.(2)The 0~3 hours isochron basically covers all areas of Yunnan province, and the 0~2 hours isochron basically realizes regional spatial integration, while the 1 hour isochron only has a higher degree of integration in the central Yunnan urban agglomeration.Finally, according to the spatial accessibility level of central cities in Yunnan province, corresponding policy suggestions are put forward.