The dynamic coupling model of the harmonious development between urbaniza-tion and eco-environment and its application in arid area
城市化与生态环境协调发展的动态耦合模型及其在干旱区的应用

Through investigating the interactive coercing and dynamic evolving relation between urbanization and eco-environment,this paper utilizes system theory to set up a dynamic coupling model for the harmonious development between urbanization and eco-environment.We argue that the harmonious development system of the urbanization and eco-environment would go through four phases: rudimentary symbiotic phrase,harmonious developmental phrase,utmost increasing phrase and spiral type rising phrase.Throughout the four phrases,the elements of the system would influence each other,coerce each other,and complete the spiral type rising process from low-grade symbiosis to high-grade harmony together.Hexi Corridor,Gansu is taken as a case study in terms of arid area.The results show that the urbanization level in Hexi Corridor has increased gradually from 1985 to 2003 accompanied with the fluctuations of eco-environment state.The response of eco-environment to urbanization has been evident,but lagged behind the urbanization course.At present,the harmonious development system in Hexi Corridor was in its harmonious developmental phrase.However,the coupling degree has increased quickly and approached 90 yet,which is signaling that the system is about to enter the utmost increasing phrase,and the ecological crisis will enter the latent period.We have found that the coupling degree can well reflect the interactive coercing and dynamic evolving situation between urbanization and eco-environment in Hexi Corridor.From the temporal change of the coupling degree,it can be concluded that urbanization sometimes needs some cost of the breakages of the eco-environment in its initial stages,but as the urbanization continues,the state of the eco-environment would meliorate.It is crucial to recognize the dynamic coupling law between urbanization and eco-environment,and adopt the proper mode to realize the sustainable development of the urbanization in Hexi Corridor.