大城市规模增长对生态宜居性的影响OA

Based on panel data from 80 major cities in China spanning from 2006 to 2021,an evaluation index system for measuring urban ecological livability is constructed to delve into the impact of urban population size and land use scale on ecological livability.The research findings indicate that the influence of population size on ecological livability in major cities is insignificant,while the expansion of land use scale has a significant positive effect on enhancing ecological livability in these cities.Further analysis reveals that the impact of ur-ban land use scale on ecological livability exhibits notable heterogeneity.Specifically,when the land use scale ranges from 800 to 1 000 km2,the enhancement effect on the ecological livability of cities becomes most pro-nounced;whereas,when the scale is too small or too large,its promotional effect diminishes.Additionally,the expansion of land use scale exerts a more pronounced positive effect on the ecological livability of megacities and metropolises,while the enhancement effect on other cities remains limited.