长江经济带城际绿色技术流动的时空特征及减排效应研究

Spatial and temporal characteristics of intercity green technology flows and emission reduction effects in the Yangtze River Economic Belt

加快绿色技术城际流动,使更多城市能够共享绿色技术,不仅是践行绿色发展战略、实现双碳目标的关键举措,也是促进要素跨区域流动、建设全国统一大市场的关键抓手。论文通过城际绿色专利转让刻画城际绿色技术流动,分析了2001—2020年长江经济带城际绿色技术流动的时空发展动态,并构建回归模型从技术集聚的视角研究了绿色技术流动的减排效应。研究发现:①长江经济带域内绿色技术流动主要由长三角地区主导,绿色技术跨区域流动不畅,跨区域绿色技术扩散经历了“随机流动→向长三角集聚→混流型”的发展路径;②长江经济带—全国绿色技术扩散活动高度集聚在长三角地区,成渝地区逐渐崛起,京津地区和珠三角地区则是长江经济带绿色技术流动的主要合作伙伴,因而形成了以京津、长三角、珠三角、成渝地区为枢纽的菱形网络;③回归结果表明,城市从外部获取绿色技术带来的本地减排效应存在规模门槛效应,即城市从外部获取的绿色技术达到一定规模后才能实现本地碳减排。文章揭示了长江经济带绿色技术流动与碳排放间的关系,对“双碳”背景下优化长江经济带区域绿色协同发展战略具有一定启示。

Accelerating the flow of green technology to enhance the sharing of green technologies among cities is not only a key measure to implement the green development strategy and achieve the dual carbon goals,but also a key step to promote the cross-regional flow of factors and build a large national unified market.This study examined the intercity green technology flow by intercity green patent transfer,and analyzed the spatiotemporal evolution patterns of intercity green technology flow in the Yangtze River Economic Belt from 2001 to 2020 with the help of big data mining and GIS spatial analysis.The emission reduction effects of green technology flow was studied from the perspective of technology agglomeration.This study found that:1)The green technology flow within the Yangtze River Economic Belt was mainly dominated by the Yangtze River Delta region,and the level of cross-regional green technology flow was low.From the perspective of flow directions,cross-regional green technology diffusion has experienced the development path of random flow→agglomeration to the Yangtze River Delta→mixed flow.2)The Yangtze River Economic Belt green technology diffusion activities at the national level were highly concentrated in the Yangtze River Delta region,with the Chengdu-Chongqing region gradually emerging,while the Beijing-Tianjin region and the Pearl River Delta were the main partners in the flow of green technologies of the Yangtze River Economic Belt,thus forming a rhombic network with the Beijing-Tianjin,Yangtze River Delta,Pearl River Delta,and Chengdu-Chongqing regions as the hubs.3)The regression results show that there was a scale threshold effect in the local emission reduction effect brought about by green technologies acquired from the outside,that is,local carbon emission reduction can only be realized after the green technologies acquired from the outside has reached a certain scale.