长江经济带一体化战略对城市创新能力的影响

Influence of Integration Strategy of Yangtze River Economic Belt on Urban Innovation Ability

在创新驱动发展背景下,如何深入推进长江经济带一体化战略,促进沿线城市创新能力的提升,是一个具有重大现实意义的研究命题。文章选取中国2008—2018年263个城市的面板数据,将倾向匹配得分法和双重差分模型相结合(PSM-DID),探索长江经济带一体化战略对城市创新能力的影响。研究结果表明:长江经济带一体化战略显著提升了沿线城市的创新能力,这一研究结论在经过一系列稳健性检验后依然成立;区域异质性检验结果表明,一体化战略对下游城市创新能力的促进作用更强,对上游和中游城市的影响尚不显著;一体化战略对不同等级城市带来的促进作用存在明显差异,其中对一线城市的促进作用最强,二线城市次之,对其他城市创新能力的影响尚不显著;进一步探索间接影响路径之后发现,长江经济带一体化战略可以通过影响政府支持力度和产业结构间接地提升城市创新能力。

Under the background of innovation driven development,how to further promote the integration strategy of the Yangtze River economic belt and promote the innovation ability of cities along the line is a research proposition of great practical significance.Based on the panel data of 263 cities in China from 2008 to 2018,this paper combines the propen⁃sity score matching method and the difference in difference model(PSM-DID)to explore the impact of the integration strategy of the Yangtze River economic belt on urban innovation ability.The results show that the integration strategy of the Yangtze River economic belt has significantly improved the innovation ability of cities along the line,which is still val⁃id after a series of robustness tests;the results of regional heterogeneity test show that the integration strategy plays a stronger role in promoting the innovation ability of downstream cities,and the impact on upstream and midstream cities is not significant;there are obvious differences in the promotion effect of integration strategy on different levels of cities,among which the promotion effect on the first tier cities is the strongest,followed by the second tier cities,and the impact on the innovation ability of other cities is not significant;after further exploring the indirect impact path,it is found that the integration strategy of the Yangtze River economic belt can indirectly improve the urban innovation ability by affecting the government support and industrial structure.