CAN SPONGE CITY CONSTRUCTION MITIGATE URBAN SPRAWL?
Sponge cities represent a systemic change in the idea of urban construction,targeting at addressing issues arising from urbanization.Since 2015,China has gradually launched pilot sponge city projects.Using a difference-in-differences model,this paper systematically assesses the impact of sponge city construction on urban sprawl,finding the following results.First,sponge city construction can effectively mitigate urban sprawl,as evidenced by robustness tests that indicate a significant mitigation effect.Second,mechanism tests reveal that compared to quantity,the construction method that combines green infrastructure with the existing block-based planning significantly mitigates urban sprawl through reverse crowding-out effects.Third,sponge city construction exhibits a law of diminishing marginal effects,with cities of lower administrative levels and urbanization levels obtaining more pronounced mitigation effects.Fourth,the mitigation effect of sponge city construction on urban sprawl is regionally selective,with cities in central China seeing a notable influence.Looking ahead,China's sponge city endeavors ought to eschew a blind pursuit of quantitative growth.Instead,prioritizing the development of green infrastructure stands as an important path to effectively maximize the efficacy of sponge cities.
sponge city constructionurban sprawlgreen infrastructurereverse crowding-out effectPSM-DID
NETL
NSTL
万方数据
