1990年以来上海“大都市阴影区”的时空演替]——基于县域尺度单元的分析

概述了“大都市阴影区”的演化机制，利用断裂点公式、K means聚类和空间相关性等方法划分了上海的影响圈层与范围，界定了1990~2010年的上海“大都市阴影区”，并对其进行了时空分析。研究表明：(1)“大都市阴影区”的构造可以分为两种类型，即“阴影区”和“半阴影区”；(2)“大都市阴影区”是处于动态变化中的区域，与中心城市、外围地区以及阴影区城市（县、城镇）3者密切相关；(3)上海“大都市阴影区”和“次阴影区”通过20 a的时间演变，在逐渐消减；(4)目前上海“大都市阴影区”主要存在于以上海为中心的南北两翼

EVALUATION OF THE RANGE AND ITS CHANGES OF #br# METROPOLITAN SHADOW AREAS OF SHANGHAI#br# ——A COUNTY LEVEL ANALYSIS DURING 1990-2010

Due to region uneven development, even some areas have the same geographical conditions, they still have significant economical gap. Some areas become parts of the centre metropolis because they have full development with the elements diffusion from centre metropolis. But the some areas become the metropolitan shadow because they lose their economical elements like surplus labors.This paper is an empirical attempt to measure the metropolitan shadow of Shanghai. It reviews a number of metropolitan shadow theories regarding evolutionary mechanisms. Based on the methods of breaking point formula, K means clusterand spatial correlation, it defines the ranges and changes of metropolitan shadow areas between 1990 and 2010 in the YangzeDelta, which were formed due to the influence of Shanghai. An analysis of GDP per capita in county level was used to carry out this study. The results showed as follows. ①“Metropolis shaded area” is a universal phenomenonas as a result of the central city and its surrounding area concentration, radiation effect relationship between different combinations to form, its structure can be divided into two types, namely the “shadow areas” and “penumbra.” “Metropolis shaded area” is not static, but a dynamic regional presence, this dynamic change and urban centers, as well as outlying areas shaded area cities (counties, cities and towns) of the three changes in the spatial pattern of economic development of the state, etc. closely related. ②The range of metropolitan shadow area has high correlation with the centre city, outlying area and shadow city which is in the shadow area. This is not only as a regional center of the city with Shanghai polarization effect, but also with the surrounding counties through its own development initiative to abate. ③The shadow area and semi shadow area range of Shanghai have been reduced. ④The shadow areas exist in the southern and northern of Shanghai city. To reduce the effects of metropolitan shadow, it need the centre city to optimize its regulation as well as the shadow areas to adopt positive strategies.