Urban Material-Metabolism Evolution And Regulation In Zhangye

City is a social-economic-natural complex ecosystem, taking human activity as the center. High input, low output, high pollution of the extensive mode of city development has caused a series of serious structural problems and environmental problems, such as environmental pollution, shortage of resources, low efficiency, and that has produced a series of punitive effect to the city of our country ecosystem and health of residents. Essentially, these problems is the result of city metabolism, such as metabolic flux, unreasonable structure of metabolism, low efficiency, these problem has caused the city metabolism metabolic disorder. City metabolism is where the city function based. Only through the perspective of in-depth study of metabolism is the way to improve city ecological environment, resource consumption, put up solution of various aspects of city problems. Therefore, the city metabolic mechanism evaluation has become an important research topic.Paper taking ecological system as the research object, accounting of resources environment and economic development of the city’s metabolic status, using the method of accounting system of energy flow, material flow, in the construction of the basic index system based on the construction of city, including metabolic flux, metabolic structure, metabolism and metabolic efficiency evaluation index system of city metabolism, and on the basis of constructing the city ecosystem health assessment index (EUEHI). Then taking Zhangye city ecological system as an example, accounting Zhangye city metabolic capacity from2001-2010, evaluated Zhangye city ecosystem healthy level evolution trend. The result shows:metabolic structure to local natural resources development and utilization based on input from outside, the system is less reliant on renewable resources dependence,,the wastes are on the rise, but in the range of load carrying ability, ecosystem health index looks upward trend.The emergy theory and analysis method of innovative applied to city metabolic capacity evaluation of quantitative analysis of city ecological system, to provide a new train of thought, conduce to improve the city ecosystem research theory and methodology system, make up for our current study in this field which is less present situation, for our country the healthy development of the City and the integrated management of the government to provide a scientific basis.