关键词: 城市影响区, 最小时间成本, 引力模型, 潜在服务人口, 宁蒙沿黄地带

Abstract:

Considering ignore of traditional urban influential spheres on population analysis, population analysis was made on non-agricultural and influential population growth rate difference, by introducing urban land and minimum time cost to extend current urban influential spheres research, better to instruct urban system planning. Base on minimum time cost, taking urban land area as urban source, urban influential spheres were delineated, by contrast with traditional Voronoi diagram based on point and polygon source. Then based on urban influential spheres, combined with population grid data and urban administrative non-agricultural population, non-agricultural and influential population growth rate difference was calculated and its mean and standard error analysis on non-agricultural and influential population growth rate difference were made to make a deeper exploration on effects of urban land and minimum time cost on urban influential spheres delineation. By employing Getis statistical index of non-agricultural and influential population growth rate difference, cities with significant non-agricultural and influential population growth rate difference were recognized, so special suggestion could be made for each type of city. A case study on the areas along Huanghe River in Ningxia and Inner Mongolia Autonomous Region in 1990, 2000 and 2010, showed after introducing minimum time cost and urban land, edges of urban influential spheres were more exact like urban administrative edges, compared to traditional point and polygon Voronoi diagram; taking urban land instead of urban point as urban source, larger city’s influential sphere was larger, while traffic seemed to narrow the gap between large and small city’s influential sphere which meant traffic helped to enlarge small city’s influential spheres and reduce large city’s spheres; Dongsheng and Yijinhuoluo Counties were typical of cities whose potentially served population grew slower than administrative non-agricultural population, so this type of urban needed to enhance diffusion effect on nearby counties, while as for cities like Dawukou and Huinong whose potentially served population grew faster than non-agricultural population, infrastructure construction emphasis should be placed on aggregation of industry and attracted more population from nearby counties. This work could provide an alternative technique for urban system planning.

Key words: urban influential spheres, minimum time cost, gravity model, potentially served population, the areas along Huanghe River in Ningxia and Inner Mongolia Autonomous Region