Shanghai Urban Ecological Security Assessment And A Comparative Study

Today, as China's cities large in scale and increase in amount, the city's ecological security problems have gradually become the focus of public attention to the scientific hot issues. Therefore, our understanding of the city's ecological security and the development status of the problem and to suggest solutions strategy on the city's sustainable development will play an important role.The city's ecological security is one of important aspect in ecological security. At the present, such this study just begins, therefore there is no mature theoretical system and evaluation methods.Based on the draw on current domestic and foreign research results, the paper studys on the basis of the city's ecological security concept, evaluation methods and applications of the research.The paper analyzes and summarizes ecological security of progress on the ecological security of the content and features.Based on systematic analysis of city ecological security in china, this paper applied pressure-state-response model (PSR), selected evaluation indicator, tried to put forward universal evaluation indices system of city ecological security, and divided city ecological security level into five grade, that was ideal safe, relatively safe, critically safe, not safe and the worst safe. The author selected Shanghai etc. as example, and used three comprehensive appraisement approach which was fuzzy overall evaluation, grey relation degree method, and main component analysis to make horizontal estimation of ecological security level for these cities in 2005. According to the result, 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 Shanghai city from 2000 to 2005 and analyzed the change trend of ecological security level of Shanghai city. According to the concrete analysis of ecological security status of these cities, found the primary ecological security problems, and then, put forward pertinent countermeasure to sole these problems.This research production can be applied on the practice of city ecological security evaluation, and can be used for reference for the development of the theory of city ecological security evaluation.