The ecological city and the sustainable development of modern city as an artificial compound ecosystem of a diversified, multi-level, multi media, the relationship between the various levels, between each subsystem and ecological elements of the perplexing, adhere to the basic principle of city ecological planning to optimize the overall trend of development, coordination, adaptation, regional differentiation, ecological balance and sustainable development as the guide, to the capacity of the environment, natural resources carrying capacity and ecological suitability as the basis, contribute to the ecological functions of reasonable zoning and create new eco engineering, its purpose is to improve the city's ecological environment quality, to seek the best city niche, constantly develop and occupy vacant niche,Give full play to the potential of the ecological system, and promote the virtuous cycle of city ecosystem, sustainable development and maintain coordination of man and nature, people and the environment.
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