兰州-西宁经济区城市体系研究

本文从兰州-西宁经济区可能包括的城市入手，利用断裂点模型通过计算首位城市断裂点距离、断裂点处场强以及各个城市辐射半径，界定兰州-西宁经济区的城市及其辐射层级结构，发现兰州一西宁经济区是双核心结构；在东部呈现出以兰州为核心，辐射白银、定西、临夏、红古等次核心圈层；在西部形成了以西宁一平安为核心，辐射乐都、湟源、民和等次核心圈层。通过位序——规模定律测度兰州-西宁经济区的城市体系结构，发现兰州-西宁经济区的城市结构体系发育水平相对较低，首位城市兰州的垄断地位较强，呈现出“孤岛型”特征。

City System Research of Lanzhou-Xining Economic Zone

This article based on the cities may include in Lanzhou -- Xining economic zone and use breaking point model, calculating the first city breaking point distance, breaking point radiation field and radius of every city, then define Lanzhou--Xining economic zone radiation level and structure, then found that in the east of Lanzhou Xining economic zone Lanzhou as the core, radiates Baiyin.Dingxi. Linxia. Honggu district which are secondary core zone; in the west Xining as the core, radiates Ledu, Huangyuan, Minhe which are secondary core zone. Then the cities in Lanzhou--Xining economic zone present a dual core structure. Using Sequence--scale law study Lanzhou--Xining city system structure found city structure system development is relatively inferior, first city Lanzhou has strong monopoly and display a ＂solitary island＂ characteristic.