Study On Urban Eco-security Assessment On The Coastal Cities In Fujian

Under the rapid development of urbanization, ecological security has become a problem closely related human life. Research on the mechanism and assessment methods of urban eco-security, our understanding of the urban eco-security and the development status of the problem and to suggest solutions strategy on the urban sustainable development will play an important role.The urban ecological security is one of the important aspects in ecological security. At the present, such study just begins; therefore, there are no mature theoretical system and assessment methods. Based on the current domestic and foreign research results which are drew on, this paper studies on the basis concept, evaluation methods and applications about the urban eco-security. This paper analyzes and summarizes eco-security of progress on the ecological security of the content and features.Based on systematic analysis of urban ecological security in the coastal cities in Fujian, the article applied pressure-state-response model (PSR), selected assessment indicator, tried to put forward universal assessment indices system of urban eco-security, and divided urban ecological security level into five grades, which are ideal safe, relatively safe, critically safe, not safe and the worst safe. The author selected four coastal cities (Fuzhou city, Xiamen city, Quanzhou city, Zhangzhou city) as example, and used four comprehensive appraisement approaches which were grey relation degree method, fuzzy overall evaluation, and main component analysis and matter-element extension assessment to make horizontal estimation of ecological security level for these cities in 2007. According to the results, analyzed the different of ecological security level among these cities, tested the rationality of evaluation indices system, at the same time, compared these appraisement approaches and selected fuzzy overall evaluation which was better than other appraisement approaches to make vertical estimation of ecological security status for Xiamen city from 2003 to 2007 and analyzed the change trend of ecological security level of Xiamen city. According to the concrete analysis of ecological security status of these cities, found the primary ecological security problem, and then, put forward pertinent countermeasure to solve these problems.This research production can be applied on the practice of urban ecological security assessment, and can be used for reference for the development of the theory of city ecological security assessment.