数字经济发展对城市碳排放影响的空间效应

为探讨数字经济对城市碳排放影响的空间效应,基于2011—2017年286个城市面板数据综合测度数字经济发展水平,运用空间杜宾模型及空间DID模型分析数字经济发展对城市碳排放的影响。主要得到以下结论：① 数字经济发展存在明显的空间异质性,发展格局从“多点式”零星分布向“组团式”聚集形态转变,但各城市发展层级差距仍未改善,长三角成为重要的数字经济高水平集聚区。② 数字经济发展显著改善了城市碳排放,通过引入“智慧城市”这一外生政策冲击进行检验,发现结论具有稳健性,而且这种效应存在明显的空间异质性,东部地区数字经济发展对碳排放的负向影响作用较强,位于城市群内部的区域受数字经济的影响更大。③ 数字经济发展对碳排放的作用在不同经济圈层内有所差异,空间外溢具有边界效应,在1100km处外溢达到峰值。④ 数字产业发展、数字创新能力以及数字普惠金融是数字经济影响城市碳排放效应发挥的重要因素。

The impact of digital economy on urban carbon emissions:Based on the analysis of spatial effects

Global warming is a great challenge faced by all mankind. The continued increase in greenhouse gas emissions will have a negative impact on agricultural production, socio-economic activities and human life, and ultimately hinder the process of achieving global sustainable development. This study attempts to introduce the variable of digital economy development into the research framework of carbon emission impact factor theory to systematically examine the effect of digital economy development on urban carbon emissions. This study was conducted to investigate the spatial effects of the digital economy on urban carbon emissions. Based on the panel data of 286 cities from 2011 to 2017, this study analyzes the impact of digital economy development on urban carbon emissions using the spatial Durbin model and the spatial DID model. The main conclusions are as follows:(1) There is spatial heterogeneity in the development pattern of digital economy, and the development pattern changes from "multi-point" sporadic distribution to "cluster" agglomeration, but the gap between the development levels of cities has not been narrowed, and the Yangtze River Delta becomes an important digital economy agglomeration area. (2) The digital economy has a significant negative effect on urban carbon emissions, and the findings are robust to the introduction of the exogenous policy shock of "smart cities". Moreover, there is spatial heterogeneity in this effect, with the negative effect of digital economy on carbon emissions being stronger in the eastern region, and the influence of digital economy is stronger in regions located within urban agglomerations. (3) In order to investigate the spatial decay characteristics of the spillover effect of the digital economy on urban carbon emissions, the spillover effect analysis of the multi-distance economic circle is carried out, and it is found that the spillover effect of the digital economy on carbon emissions peaks at 1100 km. (4) The coverage of digital infrastructure does not have a significant negative effect on carbon emissions in the region, while digital industry development, digital innovation capacity and digital inclusive finance all have a significant negative effect on carbon emissions in the region and neighboring areas. This study adds to the lack of research on the digital economy and carbon emissions, and provides some theoretical reference for the study of the environmental improvement effects of the digital economy.