Research On Supply And Demand Matching And Layout Optimization Of Urban Green Space Ecosystem Services

Nowadays,the importance of ecological environment construction in China’s development is becoming increasingly prominent.Protecting ecological space and ecosystem services is an important part of ecological restoration and ecological civilization construction.Ecosystem services are the link between human beings and the ecological environment,and the foundation and guarantee of ecological civilization construction.Urban green space is the most important ecological space of the city,with functions such as landscape,recreation,and environmental indication.Based on the theories of landscape ecology and geography,this thesis uses supervised classification,manual interpretation,POI data and other methods to extract urban green space in Jiading District,Shanghai.Selecting services and constructing evaluation system according to urban green space types.Determine the supply,demand and matching of ecosystem services.Comprehensive social equilibrium and spatial equilibrium,calculate the regional optimization coefficient.Determine the direction of urban green space layout optimization to provide scientific basis for urban planning and development.This study draws the following conclusions:(1)In 2021,the relationship between the size of urban green spaces in Jiading District is: other woodlands> arable land> protective green space> park green space>residential green space.Among the urban green space,45% are other forest land,38%are arable land,13% are protective green space,3% are parks,and 1% are residential green space.The green space is mainly based on other forest land and cultivated land,supplemented by protective green space.(2)Build an evaluation system for the supply and demand of urban green space ecosystem services.The value of ecosystem service supply in Jiading District in 2021 was calculated to be 21.96 million Yuan.Carbon sequestration and oxygen release service value accounts for the largest proportion,up to 60%.The value of leisure and recreation services accounted for the least,only 1%.Other woodlands contributed the most,accounting for 53%.Residential green space contributed the least,accounting for 1%.The total demand for ecosystem services in the western region of Jiading District is weaker than that in the eastern region.Communities with high aggregate demand intensity for ecosystem services are few and are distributed in the southeast and north.There are obvious differences in the spatial distribution of ecosystem service demand intensity.(3)By plotting the Lorentz curve and calculating the Gini coefficient,it is found that the cumulative Gini coefficient of all ecosystem services is greater than 0.8,with a huge gap and poor social equilibrium.Calculating site entropy found that communities with low levels of ecosystem services per capita were located in the centre,southwest and southeast.There are many communities with high supply-low demand matching,mainly in the northeast and south.Most of the communities have a reasonable layout of green space,mainly distributed in the north and central region.The communities for optimization are distributed primarily in Jiading Town and the southern region.