[Identification and Improvement Path of Decoupling Type of Urban Sprawl and Ecosystem Service Flow in the Yangtze River Basin， China].

The disorderly sprawl of cities leads to the spatial transmission path of ecosystem service flows being cut off， which not only hinders the sustainable development of cities but also causes serious damage to natural ecosystems. Based on the decoupling model of the elastic coefficient， a decoupling measurement model was constructed from five dimensions， namely structural dimension， density dimension， quality dimension， efficiency dimension， and morphological dimension， combined with six ecosystem service flows， namely freshwater supply， landscape aesthetics， food production， climate regulation， water conservation， and carbon sequestration， to identify the decoupling characteristics of urban sprawl and ecosystem service flow in the Yangtze River Basin. Geodetectors and geographically weighted regression models were used to analyze the driving factors， and the sustainable development path of urban sprawl and ecosystem service flow in the Yangtze River Basin was proposed. The results show that： ① From 2010 to 2020， the degree of urban sprawl in the Yangtze River Basin increased with time in the four dimensions of structure， quality， efficiency， and form and decreased with time in the density dimension. From 2010 to 2020， the flow intensity of six ecosystem service flows in the Yangtze River Basin decreased or was blocked with time. ② From 2010 to 2020， the decoupling results of urban sprawl and ecosystem service flow in the Yangtze River Basin were mainly strong negative decoupling and expansive negative decoupling， accounting for 44% and 31% of prefecture-level cities， respectively. ③ The interaction between the quality and efficiency dimensions on ecosystem service flow was the strongest， and the explanatory power of the interaction between the other factors was also more than 30%. It is necessary to propose targeted optimization strategies for different decoupling types to promote the sustainable development of urban and ecosystem service flows in the Yangtze River Basin.