黄河“几”字弯都市圈交通基础设施投资效率的空间溢出效应研究

Spatial Spillover Effect of Investment Efficiency of Transportation Infrastructure in Backward U-shaped Bend Metropolitan Area of Yellow River Basin

经济发展水平、人口流动规模等对交通基础设施投资效率的影响日益凸显,而这种影响的空间效应强度、范围以及时空过程的规律性亟待深入研究。以黄河“几”字弯都市圈15个城市为研究单元,运用超效率SBM模型测算2011—2021年基础设施投资效率,同时采用空间杜宾模型(SDM)揭示其空间溢出效应及其衰减边界,并对导致非线性影响关系的中间机制进行探讨。研究发现:黄河“几”字弯都市圈交通基础设施投资效率大体上呈现“U”字型变化,随着经济水平的发展,交通基础设施的投资效率也会随之提高,但经济发展水平对投资效率呈现出负的空间溢出效应,会降低邻近地区的交通基础设施投资效率。

The investment efficiency of transportation infrastructure is increasingly influenced by factors such as economic development level and population movement scale.However,many aspects of this influence remain to be studied,including the strength and scope of the spatial effect,as well as the regularity of the space-time process.Taking 15 cities in the backward U-shaped bend metropolitan area of the Yellow River basin as the research units,this paper used the super-efficiency SBM model to estimate the efficiency of infrastructure investment in this area from 2011 to 2021,employed the Spatial Durbin Model to reveal the spatial spillover effect and the decay boundary,and discussed the intermediate mechanism leading to nonlinear influence relationships.The research found a U-shaped change for the investment efficiency of transportation infrastructure in the metropolitan area of the Yellow River basin.With the development of the economy,the investment efficiency of local transportation infrastructure will also increase.Meanwhile,economic development level has a negative spatial spillover effect on investment efficiency which will reduce the efficiency of transportation infrastructure investment in adjacent areas.