公路基础设施对经济与环境协调发展的影响——来自成渝地区双城经济圈的证据

On Influence of Highway Infrastructure on Coordinated Development of Economy and Environment:Evidence From the Chengdu-Chongqing Economic Circle

了解公路基础设施对城市经济和环境协调发展的影响可以为城市规划和交通建设提供理论参考。本文基于2010—2020年成渝地区双城经济圈内16个城市的面板数据,通过耦合协调模型测度经济与环境的协调发展水平,采用面板固定效应模型和面板门槛模型,研究公路基础设施对经济与环境协调发展水平的影响。结果表明:2010—2020年成渝地区双城经济圈16个城市的经济与环境协调发展水平整体呈上升趋势,重庆和成都远高于其他城市,其余协调发展水平较好的城市主要集中于“双核”周围;公路密度与城市经济和环境的协调发展水平呈正相关,人口密度为负相关,而私营经济的发展和市场化程度、科技创新能力以及教育水平等都呈正相关;长期来看,公路密度的增加对城市经济环境协调发展的促进作用依然显著,且呈现边际效用递增的趋势;当公路密度小于2.043时,对经济与环境协调发展的影响系数为0.118,而公路密度超过2.043时,影响系数则增加到0.144,说明公路密度对城市经济环境协调发展的促进作用呈现出逐渐递增的非线性特征。当地应长期重视公路基础设施的建设,积极响应国家路网建设,差异化制定投资发展规划,推动交通、经济和环境的可持续发展。

Understanding the impact of highway infrastructure on the coordinated development of urban economy and environment can provide theoretical guidance for urban planning and transportation construction.Based on panel data of 16 cities in the Chengdu-Chongqing economic circle from 2010 to 2020,this paper employed a coupled coordination model to measure the level of coordinated development between the economy and the environment.Meanwhile,panel fixed effects model and panel threshold model were used to study the influence of highway infrastructure on the level of coordinated development between the economy and the environment.The results indicated that:From 2010 to 2020,the level of coordinated development between the economy and the environment of the 16 cities in the Chengdu-Chongqing economic circle showed an overall upward trend with Chongqing and Chengdu being significantly higher than other cities,while the remaining cities which kept good coordination were mainly concentrated around the“dual-core”areas;The coordinated development of the urban environment and economy was positively correlated with the density of highways,but negatively correlated with the density of population.Positive correlations were also observed in such aspects as the private economy’s development,degree of marketization,technical innovation capabilities,and education levels;In the long term,the increase in highway density still had a significant promotion effect on the coordinated development of the urban economy and environment,and it exhibited a trend of increasing marginal utility;When the highway density was less than 2.043,the coefficient of its impact on the coordinated development of the economy and environment was 0.118.However,when the highway density exceeded 2.043,the coefficient increased to 0.144.It,as a result,suggested that the promotion effect of highway density on the coordinated development of the urban economy and environment demonstrated non-linear characteristics of a gradual increase.To conclude,local authorities should attach importance to the construction of highway infrastructure in the long run,actively respond to national road network construction,formulate development plans for investment in a differentiated manner,and promote the sustainable development of transportation,economy and environment.