| As an important type of green space in urban green space system,park green space is closely related with urban population,and the synergy of both supply and demand is of great benefit to urban sustainable development.At present,the proportionality of park green space layout is an important research direction in the field of urban parks.Previous researches mainly focused on the accessibility and equity of parks.Based on the perspective of supply and demand synergy,this paper takes the streets in the main urban region of Zhengzhou City as the unit,and uses ArcGIS,ENVI and other software to extract the data of park green space and street population in 2000,2010 and 2020.By means of network analysis method,analytic hierarchy process and synergistic degree quantification method,the evaluation system and quantitative model of synergistic degree of supply and demand combining qualitative and quantitative indicators were constructed to study the synergistic evolution characteristics of park green space and street residents in the dimension of time and space.Based on this,the park optimization strategy was proposed.The findings of the study include:(1)The spatial and temporal evolution of park and residents reflects the spatial consistency between park construction and urban development and the difference between park construction and residents distribution.In the time series,the distribution range of park green space in the main urban region of Zhengzhou City expands continuously from the old urban area to the outside.The number of parks in the inner urban area increases from 22 to 76,and the park area increases by 427.25hm2.The number of parks in the new urban area increased from 3 to 167,and the park area increases by 5425.45hm2.However,the spatial layout of the street population was always dense inside and sparse outside.The total population and the minimum population density of each street showed an increasing trend,while the maximum and the difference between the maximum and the minimum of the street population density first increased and then decreased with the increase of time.The mismatch of supply and demand resources between the old and new urban areas in the main urban region of Zhengzhou City has formed the differentiation of supply and demand systems.(2)The functional synergy degree and supply-demand synergy degree of park green space both showed an increasing trend in the time series,but showed a different layout evolution trend in the spatial series.The mean value of functional synergy degree of green space in the main urban region of Zhengzhou City was 0.3181,0.5080 and 0.7181,which changed from high inside and low outside to high outside and low inside in the spatial dimension.The mean the synergy degree of recreational supply and demand of park green space were 0.3131,0.4359 and 0.5326 in the three years,which always presents the spatial layout of high inside and low outside.The recreational supply lag types in the study area always occupied the largest proportion in the three years,which was basically located in the central part of the old urban region.The mean synergy degree of ecological supply and demand of park green space was 0.3201,0.5011 and 0.6309 in the three years,which always presents the spatial layout of high inside and low outside.The number of streets belonging to the ecological demand lag types increased from 6 to 67,becoming the dominant type in 2010 and 2020.(3)According to the results of spatio-temporal evolution of supply-demand synergy degree in 2020,35 streets with lagging recreational supply and 10 streets with lagging ecological supply were selected for supply-side synergistic optimization.The optimization strategies are proposed to improve the quality of existing parks,increase the number of parks,weaken the boundary of park green space and affiliated green space,increase the area of park green land,and increase park connectivity.According to the optimization results,the synergy degree between supply and demand of the streets with lagging supply of recreation and ecology was calculated to increase by 1.3634 and 0.6706 respectively.Based on the top-down planning system,this paper adopts bottom-up supply and demand evaluation and synergistic optimization,which can promote the efficient play of the recreation and ecological functions of parks,solve the mismatch of supply and demand resources between the old and new urban areas,and improve the balance and timeliness of park construction.In the process of the development and construction of new urban areas and the renewal and transformation of old urban areas,the structure of urban park green space is constantly improved to create a coordinated urban park green space system,which provides a scientific basis for the construction of low-carbon,efficient,economical and environmentally friendly urban green space system,and constructs a green base for the future territorial space planning. |
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