城市群竞争与共生的时空机理分析

城市群演化是一个竞争与共生相互作用的过程，竞争是指在城市群内的各个城市在共同发展中为获取有利的发展地位和发展条件而进行的角逐，而共生是指群体发展中的统一规划和相互依存、相互支持的关系。城市共生关系的根本内涵和特征是空间上的临近性、时间上的长期性、功能上的分工互补性、个体之间的差异依赖性以及作用关系的支持协调性。依据系统论的原理，提出竞争与共生作用可以划分为弱竞争弱共生、强竞争弱共生、强竞争强共生、弱竞争强共生4个发展阶段，并呈现周期性特征，这从城市与区域的演化中都找到了实证。并将城市群竞争共生作用划分为群内竞争与共生、群外竞争与共生、群内竞争与群外共生、群外竞争与群内竞争4个空间作用层面，初步总结出竞争共生作用的一般模式。

ANALYSIS OF MECHANISM IN COMPETITION AND SYMBIOSIS OF URBAN AGGLOMERATION

The evolution of urban agglomerations is a process of competition and symbiotic interaction. The concept"competition"refers to that cities in urban agglomeration are competing with each other to obtain favorable development status and conditions,and"symbiosis"refers to that cities are interdependent, mutu- al-support and under unified planning of the agglomeration development. The connotation and fundamental characteristics of city symbiotic relationship include that the space locations of cities in the agglomeration are approachable,the cooperation time is long-term, individuals are interdependent on each other, and the function relations are mutual-support and coordinated. Based on the principles of system theory,it was pro- posed that the relationship of competition and symbiotic interaction can be divided into four stages: weak symbiotic interaction and weak competition stage, strong competition and weak symbiotic interaction stage, strong symbiotic interaction and strong competition stage,weak competition and strong symbiotic interac- tion stage. The evolution of the relationship between competition and symbiotic interaction exhibited peri- odic characteristics, which are demonstrated by the actual evolution process of cities and regions. Moreover, competition and symbiosis in urban agglomeration can be divided into four space dimensions: competition and symbiosis inside the urban agglomeration,competition and symbiosis outside the agglomeration, compe- tition outside the agglomeration and symbiosis inside agglomeration, and competition inside the agglomera- tion and symbiosis outside agglomeration. At last,the paper initially summarized the development model of competition and symbiosis of urban agglomerations.