产业集聚驱动粮食高质量发展机制

从产业经济学和空间经济学双重视角,探讨产业集聚对绿色全要素生产率的影响机制及其与 粮食高质量发展的内在逻辑关联,使用 ＧＭＬ指数、动态面板和中介效应模型对其作用效果与机制进行 实证检验。研究发现,产业集聚与绿色全要素生产率存在非线性的“倒 Ｕ”型关系,内部规模经济、资源 共享和技术溢出是产业集聚影响绿色全要素生产率的中介渠道,规模报酬递减、资源共享不足与技术锁 定会显著抑制绿色全要素生产率提升。从现实来看,产业集聚度不断提高促使中国粮食发展质量得到 持续改善,但目前集聚水平远未达到“倒 Ｕ”曲线拐点,利用集聚提升绿色全要素生产率尚有较大空间。 因此,通过适度规模经营、资源共享和技术溢出等中介机制充分释放集聚规模效应,实现绿色全要素生 产率持续稳步提升,是推动粮食高质量发展的基本立足点。

Mechanism of Industrial Agglomeration Driving High quality Development of Grain

From the dual perspectives of industrial economics and spatial economics, this article explores the mechanism of industrial agglomeration affecting green total factor productivity and the relationship between green total factor productivity and high quality development of grain. The GML index, the dynamic panel models and mediation model are used to empirically test the effect and mechanism of agglomeration on the high quality development of grain. It is found that the effect of industrial agglomeration on the green total factor productivity of grains is in a nonlinear "inverted U" shape. Internal economies of scale, resource sharing and technology spillover are three intermediate channels for industrial agglomeration to influence green total factor productivity, and diminishing returns to scale, insufficient resource sharing and locked technology significantly inhibit the improvement of green total factor productivity. Based on the reality, the improvement of the industrial agglomeration level has promoted the development quality of China''s grain continuously. However, the current level of agglomeration is far from reaching the inflection point of the "inverted U" curve, and there is still much room for using agglomeration to promote green total factor productivity. Therefore, the scale economy of agglomeration can be fully released through the intermediary mechanism of appropriate scale farming, resource sharing and technology spillover, so as to realize the sustained and steady growth of green total factor productivity, which is the basic foothold to promote the high quality development of grain.