智慧城市渐进式扩容政策的环境效应研究
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摘要
中国智慧城市建设试点的三次扩容政策对城市环境治理的影响是渐进式的。基于2005—2016年中国227个地级市的面板数据,采用多期双重差分模型较好地估计了扩容政策对生态环境的影响,同时运用倾向得分双重差分模型(PSM-DID)和反事实方法进行了验证。结果表明,随着不断扩容,智慧城市建设减少环境污染的影响程度不断增强,同时智慧城市扩容政策效应的实现过程是曲折的,不同时期的环境效应存在差异。进一步探究其原因,发现人力资本水平和信息基础设施等特征越高的城市,减污效应越显著,同时发现不同区位的智慧城市建设,对具体污染物的减污效应具有显著差异。上述研究为智慧城市渐近式扩容提供了新的经验证据。
The impact of China′s smart city three times construction on environment is gradual.Based on the data of 227 cities in China from 2005 to 2016,This paper applies the multi difference-in-differences model to estimatethe influence of expansion policy on environment then verify it with PSM-DID and anti-fact inferential method.The results show that with the expansion,the influence of smart city construction to reduce pollution is increasing.In the meantime,the process of smart city expansion policyis twists and the effects vary from time.Further,this paper finds that the higher level of human capital and information infrastructure the city had,the more significant the decontamination effect and the effect is not the same in different constructionlocations.This research provides new empirical evidence for the asymptotic expansion of smart cities.
The impact of China′s smart city three times construction on environment is gradual.Based on the data of 227 cities in China from 2005 to 2016,This paper applies the multi difference-in-differences model to estimatethe influence of expansion policy on environment then verify it with PSM-DID and anti-fact inferential method.The results show that with the expansion,the influence of smart city construction to reduce pollution is increasing.In the meantime,the process of smart city expansion policyis twists and the effects vary from time.Further,this paper finds that the higher level of human capital and information infrastructure the city had,the more significant the decontamination effect and the effect is not the same in different constructionlocations.This research provides new empirical evidence for the asymptotic expansion of smart cities.
引文
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2.Kharel,G.Impacts of Urbanization on Environmental Resources:A Land Use Planning Perspectivee[D].Arlington:University of Texas,2010.
3.王会,王奇.中国城镇化与环境污染排放:基于投入产出的分析[J].中国人口科学,2011(5):57-66.
4.王兵,聂欣.产业集聚与环境治理:助力还是阻力---来自开发区设立准自然实验的证据[J].中国工业经济,2016(12):75-89.
5.刘婷婷,王晓锋,袁兴中,龚小杰,侯春丽.快速城市化区河流温室气体排放的时空特征及驱动因素[J].环境科学,2019(6):1-18.
6.Grossman G,Krueger A.Economic growth and the environment[J].Quarterly journal of economics,1995,110(2):353-377.
7.李粉,孙祥栋,张亮亮.产业集聚、技术创新与环境污染---基于中国工业行业面板数据的实证分析[J].技术经济,2017(3):1-7.
8.郝汉舟,吴则宇.城市化进程中技术创新对环境污染的影响研究---基于动态联立方程模型[J].干旱区地理,2018(3):592-600.
9.陆铭,冯皓.集聚与减排:城市规模差距影响工业污染强度的经验研究[J].世界经济,2014(7):86-114.
10.卢洪友,刘啟明,祁毓.中国环境保护税的污染减排效应再研究---基于排污费征收标准变化的视角[J].中国地质大学学报(社会科学版),2018(5):67-82.