Objective As a key component of the urban ecosystem, urban green space provides multiple functions such as ecological services,air purification, and health promotion. Evaluating its ecological service value and sustainable development level can offer a scientific reference for urban green space system planning. Methods Taking Huainan City as the research area,this study evaluated eight ecological service indicators,including water conservation, carbon sequestration, oxygen release, dust retention, biodiversity protection, nitrogen oxide absorption, cooling and recreation, using statistical data from 2012 to 2022. The full permutation polygon graphic method was applied to analyze the changing trends of green space ecological service functions in Huainan City. The Eco-Economic Harmony (EEH) index was used to assess the coordination between ecological service value and socio-economic development in the region. Results The results indicated that: (1) The total value of ecosystem services provided by the green space system continued to increase,rising from 2,278.13×105 yuan in 2012 to 4,724.59×105 yuan in 2022,with a net increase of 245 million yuan and an average annual growth rate of about 7.8%. (2) The order of average value over the years was as follows: biodiversity protection> oxygen release> carbon sequestration> cooling> water conservation> dust retention> leisure and recreation> nitrogen oxide absorption. (3) Over the past 11 years, the comprehensive indices of the actual ecological service value of Huainan's green space system was 0.049, 0.116, 0.142, 0.209, 0.266, 0.403, 0.428, 0.457, 0.531, 0.706, 0.949, respectively, reflecting a year-by-year improvement in sustainable development capacity. (4) The EEH index for Huainan City over the past ten years was 0.92, indicating a moderate level of eco-economic coordinated development, approaching a high level of coordination. Conclusion The ecosystem service value in Huainan City has been increasing annually. However, the growth rate of the urban economy still exceeded that of the ecological services value. Future urban economic development should prioritize ecological environment protection, and it is particularly important to enhance relevant laws and regulations to prevent damage to urban green spaces.
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