Ecological Urban Land Expansion - Jinhua City, Zhejiang Province, For Example

The phylogeny of human society civilization is the history of human beings making nature change and creating suitable living space for themselves. Urban is focal area of the human society civilization phylogeny, and also is the central area of human beings make nature change. Many problems arise with the development of modern cities, the ecological problem is the main subject. It becomes more and more sever and the ecological security trend isn't optimism in the world, especially in China. Some local area ecosystem destory has imperiled to the development of economy, and will endanger the sustainable development of local area or the wolrd in future. Particullaly in high-level cities, the natural ecosystem has been destoryed and replaced compeletly by man-made or half-natural ecosystem, so the study of ecological security is becoming more important. As an ideal model will make sustainable urban development come true, eco-city is the best way which can help us to confront with ecological problems, guarantee the ecological security and at last accomplish it's own sustainable development. The paper take the target of the eco-city construction in Jinhua city as the starting point, to probe the problem in urban land use expansion from the ecological security, and to find some strategies for the land use expansion of eco-city construction in Jinhua.To provide the powerful theory sustainment and technic support, the paper generalizes the theory in eco-city and urban land use expansion fields in detail, and put forwards the new Pressure-State-Response(PSR) frame of this study. Then based on the overall estimate of the land use change and urban land use expansion in the near decade, the mechanism of urban land use expansion driving forces and the ecological security impacts is analyzed. The paper thirdly evaluates the eco-city construction level from the structure function and harmony three aspects, and the evaluation result reflects that the urban land use expansion and ecological security problems affect its general level. Finally, the paper takes the eco-city level as evidence, the status of urban land use expansion ecological security in Jinhua was evaluated by PSR-AHP comprehensive evaluation method. On the base of final evaluation facts, the study brings forth the detailed countermeasures and general countermeasures to maintain the eco-city construction land use expansion ecological security.