Evolution of Port Urban Agglomerations in the Bohai Rim Based on Niche Theory:Pattern Change and Symbiosis Strategy
In order to scientifically analyze the spatial pattern evolution of port urban agglomerations in the Bohai Rim,this paper takes 17 port cities in the Bohai Rim as research units,constructs an ecological niche evaluation system of port urban agglomera-tions based on ecological niche theory.Then the ecological niche situation,ecological niche overlap,ecological niche suitability and evolutionary momentum of each port city from 2003 to 2020 are calculated to reveal the spatiotemporal evolution character-istics of port urban agglomerations in the Bohai Rim.The results are shown as follows.① Tianjin,Qingdao and Dalian are still the core cities in the ecological niche pattern of port urban agglomerations in the Bohai Rim.However,the development of Dalian tends to weaken,and the port cities with moderate ecological niche levels are gradually increasing.The port cities in Shandong Province have shown more positive development momentum,while the port cities development in Liaoning Province is weak rel-atively.② The internal competition of port urban agglomerations in the Bohai Rim is significant,but it is relieving gradually.Most port cities with moderate ecological niche levels have a high degree of niche overlap due to homogenization of develop-ment.③ The mean value of ecological niche suitability of port urban agglomerations in the Bohai Rim is decreasing,while the evolutionary momentum is high,so this indicates that the symbiotic process of the port urban agglomerations still has great po-tential.Finally,the symbiosis strategies based on ecological niche are formulated for various types of port cities,including eco-logical niche expansion,ecological niche dislocation and ecological niche coordination,thus providing feasible paths for the evolu-tion and symbiosis of the port urban agglomerations in the Bohai Rim.
port citynicheevolutionpatternsymbiosisthe Bohai Rim
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