多时空交通圈的内涵、划分及其特征分析

空间和时间因素构成的时空关系或时空结构是进行区域研究的重要视角，众多研究者对区域分析中的空间、时间因素及时空分析框架进行了论述，并提出时距、等时圈、时空圈、经济圈等重要概念。基于这些分析，中心城市对外多时空交通圈就是以多种交通方式衡量的、不同时空距离的时空圈总和，其时空圈具有中心—辐射、时空收敛、非连续性、非对称性的基本特征；而按照公共交通方式时距3小时为界可将中心城市时空圈划分为近距离时空圈和远距离时空圈两大类，不同时空圈具有不同的经济活动特征。

Analysis of the Connotation,Division and Characteristics of Multi-temporal-and-spatial Traffic Circle

Time-space relationship or time-space structure constituted by space and time factors is an important angle of view when it comes to regional researches. Based on the understanding of space and time factors in the regional researches on the formation of temporal and spatial analysis framework, the related concepts like interval, equal-time traffic circle, temporal and spatial traffic circle and economic circle are differentiated and analyzed. The external multi-temporal and spatial traffic circle of central city is measured with a variety of transportation means, which is the sum of temporal and spatial traffic circle formed by different time and space distances. The temporal and spatial traffic circle has basic characteristics such as center-radiation, temporal convergence, discontinuities and non-symmetry. According to the time spent on public transportation （three hours as the standard） , temporal and spatial traffic circle can be divided into two types： short-distance temporal and spatial traffic circle and long-distance temporal and spatial traffic circle, which has its different characteristics of economic activities.