城市蔓延真的抑制城市创新空间集聚吗

利用我国地级市面板数据，分别基于创新效率、知识溢出、就业匹配3种机制，解析城市蔓延对城市创新空间集聚的影响效应。研究发现：城市蔓延普遍对城市创新空间集聚产生负向全局处理效应，但经过创新效率、就业匹配以及知识溢出机制的调节后，该负向效应可以得到缓解甚至扭转。当城市蔓延导致城市就业密度、基础设施或工资水平下降时，则可能加剧这种负向效应；相对其它城市，东部地区或规模较大城市的城市蔓延会对创新空间集聚发挥提升效应。

Does Urban Sprawl Really Makes Against Spatial Agglomeration of Urban Innovation

Using the panel data of prefecture-level cities in China from 2007 to 2017, respectively from respective three mechanism of innovation efficiency, knowledge spillover and employment matching, this article analyzes mechanism effects of urban sprawl on urban innovation agglomeration, finding that: ① Urban sprawl widely makes negative global treatment effects on innovation agglomeration, which can be mediated by mechanism of knowledge spillover, innovation efficiency or employment matching, to generate positive effects. ②If urban sprawl lows employment density, infrastructure input or wage level, urban sprawl will does more harm to urban innovation agglomeration. ③Urban sprawl of the eastern region or large-scale city could plays relatively positive global treatment effects on urban innovation agglomeration more easily through mediating by above three mechanism than others.