| China has proposed the construction of Shanghai international shipping center from 1995,more than 10 national or provincial shipping centers have planed or constructed.These shipping centers are international or regional,coastal or inland,comprehensive is dominated by foundation of harbor and shipping.Under the situation of several shipping centers,the function of some shipping center is overlapping and the differentiation becomes the inevitable trend.Due to the complexity of the shipping center,dynamic change and gradual,the theory and practice of the shipping center is not completely unified.The research on the evolution of the shipping center is still in its infancy and exploration stage.At the other hand,the development of information technology and the soft and hard power continuously strengthening makes the radiations of the shipping centers and other port cities between competing more and more complex.How shipping center in the complex relationship seeking its own development is a problem that must be faced in the evolution of the shipping center.According to the problems existing in the evolution of the shipping center,this paper introduces the ecological niche theory in ecology,and studies the evolution of the ecological niche of shipping center to find out the answers to these questions.This paper mainly carried out the following aspects of the work:1)To define the ecological system and ecological niche of the shipping center.Based on the definition of the shipping center,the concept and the structure of the ecological system of the shipping center are defined,and the concept of the ecological niche of the shipping center is proposed,meanwhile,analyzes the niche dimensions and niche overlap and separation.Based on the definition of the ecological niche and the basic niche concept,the evolution law of the ecological niche of the shipping center is analyzed,and the evolution of the shipping center is explained.2)Based on the analysis of shipping center in the niche evolution level,using different models to study with populations of shipping center realized niche evolution,population niche as well as the evolution of the community between niche evolution mechanism,and the mechanism of shipping center in determining the ecological basis after the niche of the whole evolution process.3)Based on the maximum entropy principle(MIEP)of the theory of complex systems,this paper analyzes the applicability of the MIEP theory to the evaluation of the ecological niche of shipping center.And then use the MIEP principle constructing the shipping center in the niche evolution model evaluation,including calculation of shipping center niche evolution equation and self organizing feature map network(SOM Net)of the evolution equation and validate the realization of the classification standard of niche evaluation model of the shipping center.4)Based on the analysis of the evolution mechanism of the ecological niche of the shipping center,the basic niche competition strategy of the shipping center is studied;Using effect of inframarginal analysis of the principle of general traffic impedance on shipping center based niche competition strategy selection,after analysis the traditional fundamental niche strategy choice matrix of the traditional niche after the calculation of degree of overlap.Then the niche overlap degree and the calculation model of niche overlap based on the generalized traffic impedance and the realization of niche were proposed.Finally,based on the comprehensive niche overlap and the size of realization of the ecological niche,the strategic choice competition matrix of the basic niche of shipping center is constructed.5)An empirical study on the evolution of ecological niche of Wuhan shipping center,the innovation of this paper is mainly in the following aspects:(1)The hierarchy structure of the ecological system of the shipping center and the concept of the ecological niche of the shipping center are put forward.(2)The ecological niche evolution model of shipping center that based on the principle of MIEP is proposed.(3)An improved niche overlap model considering the generalized traffic impedance and the realization of the niche size is proposed.It is a new attempt to study the special port city and ecological niche theory of shipping center,it is not only the development of the shipping center study,but also a complement to the ecological niche theory in the research field of sociology benefit.The paper puts forward the views and conclusions of the shipping center to deal with the evolution of the relationship between the evolutions of the port city group development have an important significance. |
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