生态经济

低碳城市试点政策本质上是推动城市绿色转型和可持续发展的环境规制工具。探讨其对区域绿色创新的影响效应，对于完善环境政策理论框架和指导城市绿色发展实践具有双重意义。基于2006—2021年中国276个城市的面板数据，运用多期双重差分法，系统考察了低碳城市试点对区域绿色创新的影响，同时深入分析了政策效应的作用渠道和区域异质性。研究发现：(1)低碳城市试点实现了区域绿色创新的“量质并进”，区域绿色创新质量的提升效果更大且具有滞后效应，经过一系列检验，结论依然稳健。(2)机制检验表明，低碳城市试点通过强化政府支持力度与推动绿色金融发展两条路径实现区域绿色创新的“量质并进”，且二者存在显著的协同效应。(3)异质性检验表明，低碳城市试点政策对东部地区绿色创新数量的提升效应更为显著，而对中部地区绿色创新质量的促进作用更为明显。

The essence of the low-carbon city pilot program is an environmental regulatory policy that promotes the green transformation of the urban economy and society and realizes sustainable urban development.Exploring the impact of the low-carbon city pilot program on regional green innovation holds significant theoretical and practical significance.Based on a panel dataset comprising 276 Chinese cities over the period from 2006 to 2021,this paper quantitatively analyzes the influence of the low-carbon city pilot program on regional green innovation using the multi-period difference-in-differences method.It conducts an in-depth study of the underlying mechanism and regional heterogeneity.The research findings are as follows:(1) The low-carbon city pilot policy has achieved a “dual advancement in scale and quality” of regional green innovation,the improvement effect of regional green innovation quality is greater and has a lag effect.After a series of tests,the conclusion remains robust.(2) The mechanism test indicates that the low-carbon city pilot program can promote the “dual advancement in scale and quality” of regional green innovation by increasing government support and facilitating the development of green finance,and both have a significant synergy effect on regional green innovation.(3) The heterogeneity test suggests that the low-carbon city pilot program can effectively boost the scale of green innovation in the eastern region and improving the quality of green innovation in the central region.