Abstract:

As one of the major places of recreation and leisure for the residents,urban public green space has fundamentally important function for social service.In addition,this function is one of the most significant components of ecosystem services provided by urban green space.When evaluating the social service function of urban public green spaces for the residential districts,the effectiveness of their utilization and the service equity for all the residents should be considered simultaneously.In order to analyze the social service function of urban public green space for the residential districts quantitatively,this paper presents a new comprehensive evaluation system,including three indices: service coverage ratio,service overlap,and service population per unit area of urban public green space.The service coverage ratio is the ratio of area of residential districts located in the service region of urban public green spaces to the total size of residential districts.The service overlap is the number of urban public green spaces serving for a specific residential unit.The service population per unit area of urban public green space is the average population served by urban public green space unit.Taking the central area of Shanghai as an example,definitions for three indices are elaborated.The methods and procedures are proposed to calculate the results based on the techniques of Geographic Information System (GIS).And the methods have been implemented as software tools which are successfully applied in the quantitative analysis of the urban public green spaces (area ≥3 000 m2) in the central area of Shanghai.The results reveal that the service coverage ratio of the major urban public green space for residential districts is over 80% and the average service overlap reaches 221.At the same time,the average service population per unit area is 117.The three indices can provide an effective way for quantitative analysis of the social service function of urban public green space