财经问题研究

数字经济为实现经济增长与土地绿色利用提供了新的可能。基于2003—2023年长江经济带108个城市的面板数据，本文采用双向固定效应模型和动态空间杜宾模型研究数字经济对土地绿色利用效率的影响、作用机制及空间溢出效应。研究结果显示：数字经济能够提升土地绿色利用效率；“宽带中国”示范城市政策能够增强数字经济对土地绿色利用效率的提升效应；数字经济对长江中游、下游地区土地绿色利用效率的提升效应更明显；数字经济通过推动产业集聚、促进技术创新和加强环境规制提升土地绿色利用效率；数字经济对土地绿色利用效率的影响还会通过空间溢出效应对邻近地区产生正向影响，且长期溢出效应大于短期溢出效应；数字经济对土地绿色利用效率的空间溢出效应受到地理距离的限制，随地理距离增加呈现先促进后抑制，直至不显著的趋势。为了提升土地绿色利用效率，应充分发挥空间联动效应，推动产业结构优化升级，打造区域数字产业集群。

Although the traditional “land-driven development” model created the “Chinese miracle” of economic growth,its accompanying problems, such as inefficient land use, extensive production patterns, and ecological degradation, have gradually emerged. Facing the severe challenge of limited land resources, actively revitalizing underutilized land, adjusting land use patterns, and promoting intensive, green, and low-carbon land use transitions can not only curb high resource consumption and pollution emissions but also alleviate structural imbalances and regional disparities in land supply-demand relationships, laying a solid foundation for sustainable land resource utilization. Therefore, balancing economic development with environmental protection and improving green land use efficiency has become an urgent issue.This paper employs panel data from 108 cities in the Yangtze River Economic Belt from 2003 to 2023, using a two-way fixed effects model and a dynamic spatial Durbin model to study the impact of the digital economy on green land use efficiency, the mechanisms, and its spatial spillover effects. The findings indicate that the digital economy can enhance green land use efficiency. Its empowering effect is more significant in the central and lower reaches of the Yangtze River.The implementation of the “Broadband China” strategy has strengthened the empowering effects of the digital economy on green land use efficiency. The digital economy mainly enhances green land use efficiency by promoting industrial agglomeration, facilitating technological innovation, and strengthening environmental regulation. The positive impact of the digital economy on green land use efficiency is not limited to the local area but also exerts a positive influence on surrounding regions through spatial spillover effects, with long-term spillover effects being stronger than short-term ones.The spatial spillover effects of the digital economy on green land use efficiency are constrained by geographical distance,showing a trend of first promotion and then inhibition as distance increases.This paper's potential marginal contributions are as follows. First, it proposes that the digital economy enhances green land use efficiency by promoting industrial agglomeration, facilitating technological innovation, and strengthening environmental regulation. It examines the transmission effects of these three mechanisms, thereby deepening the explanation of how the digital economy boosts green land use efficiency. Second, it provides a more comprehensive empirical identification of the short-term and long-term spatial effects of the digital economy on green land use efficiency,offering new perspectives and methods for research in related fields. Third, it verifies the hypothesis that spatial spillover effects decrease with economic geographic distance and measures the regional boundaries of spatial spillover, providing empirical support and decision-making references for differentiated policy formulation across regions.