电力消费对生态效率的作用路径及效应研究

Research on the Path and Effect of Electricity Consumption on Eco-efficiency

采用2007—2018年中国30个省市、自治区的面板数据,通过中介效应法分析电力消费对生态效率的作用路径,构建面板门槛回归模型,分析电力消费水平、人均国内生产总值以及外商直接投资为门槛变量时电力消费对生态效率作用效应的区域异质性和门槛效应。结果表明:(1)电力消费对生态效率不仅存在直接效应,还通过技术创新这一间接路径影响生态效率;(2)电力消费对生态效率的作用存在门槛性,电力消费对生态效率的影响由显著的负效用变化到不显著的负效用,甚至演变为1%显著水平下的正向效用;(3)以各区域经济发展水平为门槛时,电力消费对生态效率的负作用效应呈倒“U”型;(4)以外商直接投资为门槛时,电力消费对生态效率的负影响呈现出逐渐减少的趋势。

Using the provincial panel data of 30 provinces and cities from 2007 to 2018,the effect path of power consumption level on eco-efficiency was analyzed through the mediating effect method and threshold effect.Then,a panel threshold regression model is constructed to analyze the regional heterogeneity of the effect of power consumption level on eco-efficiency when power consumption level,per capita economic development level and foreign investment are threshold variables.The research results show that:the power consumption level not only has a direct effect on eco-efficiency,but also indirectly affects ecological efficiency through the path of technical innovation.There is regional heterogeneity in the effect of electricity consumption level on eco-efficiency.With the gradual increase of electricity consumption level,the impact of electricity consumption on eco-efficiency changes from a significant negative effect to an insignificant one,and finally even it evolves into a positive effect at a significant level of 1%;when the economic development level of each region is used as the threshold variable,the negative effect of electricity consumption level on eco-efficiency is inverted"U";when FDI is the threshold variable,the negative impact of electricity consumption level on ecological efficiency shows a declining trend.