重庆大学学报（社会科学版）2025，Vol.31Issue(1)：100-116,17.DOI:10.11835/j.issn.1008-5831.jg.2024.10.004
数字基础设施对城市碳排放的时空动态效应
The space-time dynamic effects of digital infrastructure on urban carbon emissions:Evidence based on the quasi-natural experiment of Broadband China
摘要
Abstract
As digital economy becomes a trend to achieve high-quality economic development and green low-carbon transformation,digital infrastructure also rises to the level of national strategy.In this context,in-depth exploration of the intrinsic impact mechanism of digital infrastructure on carbon emissions,and systematic analysis of whether the Broadband China policy has dynamic sustainability and spatial spillover effects from theoretical and empirical perspectives are of great practical significance for the further implementation of the national strategies of Network Power and Digital China,and for the advancement of the construction of digital infrastructure and the exploration of new urban development models and governance models for low-carbon development.This paper puts digital infrastructure and carbon emission into the same framework,explores the intrinsic influence mechanism and spatial-temporal dynamic effect of digital infrastructure on carbon emission from the theoretical level,and innovatively incorporates double-difference into the construction of spatial matrices.Based on the Broadband China strategy as a quasi-natural experiment,using the panel data of prefecture-level cities in China from 2006 to 2019,this paper utilizes the asymptotic double difference method,spatial model and mediation effect model to test the intrinsic mechanism and spatial-temporal dynamic effect.The results show that the Broadband China policy has a significant inhibitory effect on carbon emissions,and this conclusion still holds after the robustness tests of instrumental variables method,triple difference method,and PSM-DID.Impact mechanism analysis shows that digital infrastructure can both directly affect carbon emissions and promote carbon emission reduction through industrial structure upgrading and green technology innovation.Spatial-temporal dynamic effects analysis shows that the impact of the Broadband China policy on carbon emissions has a time lag,and it will be played only in the second year,but the marginal effect shows an increasing trend over time.Moreover,the Broadband China policy has a positive spatial spillover effect on carbon emissions in geographically and economically similar regions.Heterogeneity analysis reveals that the carbon emission reduction effect of the Broadband China policy is not significant in the western region,but more obvious in the eastern and central regions,and the effect in the central region is larger than eastern region.Therefore,the article suggests continuing to improve the digital infrastructure,strengthening the promotion of the pilot policy of Broadband China;implementing dynamic and differentiated strategies according to local conditions;accelerating the transformation and upgrading of the industrial structure,improving the level of green technological innovation,and smoothing the intermediate channels of digital infrastructure for carbon emission reduction.关键词
数字基础设施/"宽带中国"战略/碳排放/时空动态效应/影响机制/双重差分模型Key words
digital infrastructure/Broadband China strategy/carbon emissions/space-time dynamic effects/influence mechanism/double difference model分类
经济学引用本文复制引用
汪亚美,余兴厚..数字基础设施对城市碳排放的时空动态效应[J].重庆大学学报（社会科学版）,2025,31(1):100-116,17.基金项目
重庆市教委人文社会科学重点项目"人口结构变化下重庆农村基本公共服务可及性提升机制研究"(22SKGH196) （22SKGH196）
重庆市研究生科研创新项目"绿色发展理念下数字经济对长江经济带城市群碳排放的影响机理及实证研究"(CYB22270) （CYB22270）
重庆工商大学"学习贯彻党的十九届六中全会精神"专题重点课题"百年来党对中国式现代化道路探索的演进逻辑与经验启示研究"(ctbu1zqh07) （ctbu1zqh07）
