School of Economics and Management, Wuhan University, Wuhan 430072, China.
Information Institute of The Ministry of Emergency Management of PRC, Beijing 100029, China.
Int J Environ Res Public Health. 2022 Mar 27;19(7):3980. doi: 10.3390/ijerph19073980.
Taking 286 cities above the prefecture level in China as the research object and the research period from 2003 to 2019, through the two-way fixed effect model, this paper empirically analyzes the impact of the city level on environmental collaborative governance. The threshold regression model is used to reveal the nonlinear relationship between urban levels and environmental collaborative governance and to analyze the phase characteristics of different urban levels for environmental collaborative governance. The results show that: (1) The city level has a significant role in promoting collaborative environmental governance. (2) The regression results of the three major sections show that the urban level promotion in the eastern region has the strongest promoting effect on the coordinated environmental governance, and the western region is the weakest. (3) The impact of the city level on collaborative environmental governance is nonlinear. When the city scale reaches a certain critical point, its impact on the collaborative environmental governance tends to intensify.
以中国 286 个地级及以上城市为研究对象，研究时段为 2003 年至 2019 年，通过双向固定效应模型，实证分析城市层级对环境协同治理的影响。利用门槛回归模型揭示城市层级与环境协同治理之间的非线性关系，并分析不同城市层级对环境协同治理的阶段性特征。结果表明：（1）城市层级对协同环境治理具有显著的促进作用。（2）三大区域的回归结果显示，东部地区城市层级提升对协调环境治理的促进作用最强，西部地区最弱。（3）城市层级对协同环境治理的影响是非线性的。当城市规模达到一定临界点时，其对协同环境治理的影响趋于增强。
