| As an important part of mountain city ecosystem,mountain city green space system plays an irreplaceable role in construction and protection of ecological environment and conducts scientific and rational layout for green space system so as to realize maximum efficiency.During construction of mountain city green space system,the constructer neglects mountain city’s texture due to lack of guidance on detailed and scientific theory system and leads to plain-like green space development mode,which weakens landscape feature of mountain city and also affects virtuous circle of natural ecosystem.Based on mountain city features,scientific and reasonable layout for the green space system is significant.This paper summarizes features of green space system layout for mountain city and optimizing strategy for green space system layout of mountain city under support of RS and GIS and concludes results according to empirical study and theory:(1)Based on analysis of natural conditions of mountain city and urban development features and deep research on forms and methods of layout for mountain city green space system,find current green space problems of mountain city,which provides the basis for research and optimization of mountain city green space system layout.(2)Conduct detailed discussion of investigation on current condition of mountain city green space system layout and optimization for green space system planning space layout of mountain city based on suitability evaluation under technical support of RS and GIS,and put forward a theory and method system of optimizing mountain city green space system layout.In terms of spatial layout,optimization suggestions are put forward from several aspects such as urban wind environment,green corridor and green network system,ecological barrier and vertical space greening.In terms of structure layout,based on the urban layout of mountain city,a green space system with“green core-green corridor-and green network”is proposed.On the optimization of the layout of all kinds of urban green space,the optimization strategy based on urban green space indicators and citizens’recreation needs is put forward.The optimization strategy of mountain city green space system layout makes up the shortage of the theory of the planning of the green space system of the mountain city,and provides the reference for the planning work of the green space system in the mountain city.(3)On the basis of the analysis of the natural and humanistic conditions in the downtown area of Chengde,RS and GIS technology are used to investigate the layout of the green space system and the suitability evaluation of the green space in the downtown of Chengde,and the layout of the green space system is optimized by using the optimization strategy of the layout of the green space system in the mountain city.On the spatial layout,5 suggestions are proposed,which are reserving city ventilation corridor,building urban green ecological corridor,protecting the city green barrier,creating mountain characteristic parks,strengthening the construction of green space around historical sites.On the structure layout,put forward green space structure of“one circle–two cores–three belts–three districts–multiple points”.On the optimization of the layout of all kinds of urban green space,the total area of urban green space increased from 4575.88hm~2 to 5200.31hm~2,the green space rate in the built-up area increased from 39.88%to 41.99%,and the green coverage rate of the built-up area increased from 43.93%to 46.77%;the per capita green area increased from 85.65m~2 to 89.73m~2;the per capita park green area increased from25.32m~2 to 27.29m~2;the recreation park green space service area ratio increased from44.83%to 53.15%,The service population increased from 60.71%to 67.26%.The practice shows that the layout optimization strategy of the green space system under the support of RS and GIS technology is feasible,and can be used as the basis for the planning and revision of the urban green space system. |
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