In urban greenbelt construction, return the diversity that should notice protector is planted, biology diversity (Biodiversity) , the expert defines so: “ life organism and the diversification that its bilk the zoology synthesis with living (Variety) and variability (Variability)” . Press this definition, biology diversity is to point to all sorts of different interaction between varied life form and environment. The diversity of species will increase ecosystem to stabilize rate, inside the ecosystem with tall diversity, nutrient correlation will more diversification, the way that energy flows also more diversification, the energy between each nutrition class flows will more tend stable, tall diversity also will enhance the counteractive ability that after ecosystem is disturbed, to coming from outside the system sort inbreaks, in the meantime, also increased the certain inside the system to plant all and individual the distance between, reduced plant pathogen diffuse. Also reduced the odds that plant diseases and insect pests erupts. The ecosystem with tall diversity can make full use of time, space and resource, use environmental resource effectively, the productivity with long-term tenability and stability, improve a service for the environment.
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