| With the acceleration of urbanization and the sustained and rapid development of economy and society,the circulation of goods in urban production and consumption is more frequent.Especially under the background of the accelerated development of urbanization and the planning adjustment of city function areasin China,the city comprehensive transportation system and modern logistics system is being improved,and the scale of city logistics demands continues to grow,so the development of city logistics industry cluster is right in the golden period of rapid development.To promote the healthy development of city logistics industry cluster,is not only the guarantee of supporting the economic operation,city residents' life,price stability and economic transformation and upgrading,but also an important way to reduce the cost of social logistics,improve circulation efficiency,enhance the city's comprehensive competitiveness city.However,there are many problems in city logistics industry such as fragmentation,poor convergence,imperfect industry chain,low efficiency of resources integration,high logistics cost,etc.,and the good ecological order of the city logistics industry cluster has not formed which has affected the development of city economy.Therefore,it is necessary to consider the ecological order and the sustainable development of urban logistics industry cluster from the view of whole city.Because of the long-term stable relations of cooperation,city logistics enterprises and their supporting service organizations often get together to develop.They take up the specific niche space in city logistics industry cluster,and their roles and functions are different.They constitute the city logistics ecological chain network with the supporting of material flow,energy flow,capital flow,information flow and knowledge flow and interaction,and they realize the integration effect,agglomeration effect,synergy effect and symbiotic effect through the mutual contact and mutual coupling.Moreover,they and their non biological environmental factors together constitute a symbiotic system,namely the city logistics industry cluster ecological system.The study of structure and evolution mechanism of city logistics industry cluster ecosystem is useful to accurately grasp the development rules and trends of city logistics,and it can offer the accurate basis for making city logistics development planning,policies and measures according to the city planning,industrial layout,transportation and logistics facilities distribution to promote the sustainable development of the city logistics.Therefore,the dissertation focuses on the structure,evolution mechanism and health assessment of city logistics industry cluster ecological system from the research view of complexity sciences.The main research contents and results are as follows:(1)Based on the ecosystem metaphor and the formation analysis of ecological chain and value chain of city logistics industry cluster,the concept and characteristics of city logistics industrial cluster ecosystem are analyzed.On this basis,according to the elements association of industrial clusters and the structure of organizational ecology system,the model of city logistics industry cluster ecosystem is established,which is composed of production subsystem,service subsystem and environment subsystem.The hierarchical structure and organization division of city logistics industry cluster ecological system are analyzed,and its ecological balance conditions and rules are summed up.(2)After the ecological niche connotation of city logistics industry cluster is analyzed,the niche breadth measure model and niche overlap measure model of city logistics industry cluster enterprises are built,and the niche evolution of city logistics industry cluster enterprises is analyzed.Then,based on the Lotka-Volterra model,three modes such as competition,cooperation and competition-cooperation city logistics between city logistics industry cluster populations are built,and the stability of the models are analyze and the numerical simulation is carried out using Matlab software evolution.In addition,considering the impacts of external environmental factors and the invasion of new species,the metapopulation evolution models of city logistics industrial cluster ecosystem are built,and the numerical simulation is carried out with Matlab software to reveal the influence of changes in the external environment factors on metapopulation evolution of city logistics industrial cluster ecosystem.(3)Based on the dissipative structure and synergy theories,the evolution of self-organization conditions and characteristics of city logistics industry cluster ecological system are analyzed,and the system formation and triggering mechanism,development and self reinforcing mechanism,locking mechanism,recession and upgrading and restructuring mechanism of city logistics industry cluster ecological system evolution are described.From the driving forces of exogenous and endogenous two aspects of city logistics industry cluster ecological system are discussed,the evolution dynamic mechanism model is built based on Haken Model,and the influences of the fluctuations and the order parameter on system evolution are analyzed.Then,the whole evolution model of city logistics industry cluster ecological based on the compound logistic development mechanism are built,and the processes and the characteristics of the evolution life cycle of city logistics industry cluster ecological system,and the forecast simulation and empirical analysis are carried out.(4)According to the structure and health characteristics of industry ecosystem,the health assessment meaning and characteristics of city logistics industry cluster ecosystem is analyzed.Moreover,the index system of health assessment of city logistics industrial cluster ecosystem is established according to the city logistics industry cluster ecosystem evaluation objective,the social economy development,the ecological vitality and sustainable development concept,which includes the four level of organization structure,industry cluster development industry,ecological restoration,industrial development environment and 26 assessment indexes.Then,a fuzzy matter-element comprehensive evaluation model based on improved entropy weight is constructed to evaluate the health level of the urban logistics industry cluster ecosystem.(5)According to the roles and functions of ecological environment and internal elements of city logistics industry cluster ecological system,some orderly evolution countermeasures and suggestions of city logistics industry cluster ecological system are put forward,which include promoting the optimization and coordination of city logistics cluster niches,enhancing the diversity of city logistics industry cluster,increasing the operation efficiency of city logistics cluster,optimizing the city logistics industry development policies and so on. 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