珠三角城市群空间效应的分维测度

引用分形几何学的相关理论,通过研究城市群中心城市和其周边城市的相对位置和大小等级,从分维的角度研究城市群的空间效应。结果显示：广东省城市空间分布以珠三角城市群的中心城市广州为核心,呈现集聚分布形态;随着与中心城市距离的扩大,城市的规模逐渐变小;在所选取的3个年份中,2008年的集聚程度最强,2000年的集聚程度较强,2004年的集聚程度较弱。从而说明了广东省城市空间分布是一种分形结构,珠三角城市群的集群化效应是广东省城市发展的主导力量,并且2000年～2004年城市群的涓滴作用占主导地位,而2004年～2008年城市群的极化作用占主导地位。

THE RESEARCH OF SPATIAL EFFECT IN PEARL RIVER DELTA CITY GROUP BASING ON THE FRACTAL THEORY

This paper analyzes the space effect of city group basing on the fractal theory and studies the relative position and size levels between the central city and its neighboring cities.The results can be described in the following aspects.Firstly,the space distribution of cities in Guangdong Province takes a form of aggregated distribution with Guangzhou as the key city in Pearl River Delta.Secondly,the city size dwindles as the distance from the central city increase.Thirdly,in the three selected years,the clustering coefficient in 2008 was the highest level,which was followed by 2000,and the year of 2004 reported the lowest level.These results indicate that the city space distribution in Guangdong Province is a fractal structure,and the agglomeration effect of Pearl River Delta city group is the leading force of the development of Guangdong Province.The trickle-down effect of urban agglomeration was the dominant force during the period from 2000 to 2004,while the polarized action of urban clusters played a major role between 2004 and 2008.