农机投入对农业GTFP影响及门槛效应的区域差异分析

按照粮食的产销情况，将全国划分为3类粮食功能区域，利用固定效应模型和门槛效应模型分析了农机投入对农业绿色全要素生产率（GTFP）的影响及门槛效应的区域差异。结果表明：农机投入对农业GTFP的影响程度存在区域异质性，农机投入对粮食主销区农业GTFP提升的促进作用最大，粮食产销平衡区次之，粮食主产区最小；农机投入对农业GTFP的影响路径亦存在区域差异，粮食主产区和产销平衡区的农机投入通过促进农业技术效率和农业技术进步进而推动农业GTFP提升，粮食主销区的农机投入通过促进农业技术进步推动农业GTFP提升；农机投入对粮食主产区农业GTFP的影响存在双门槛效应，对粮食主销区和产销平衡区农业GTFP的影响存在单门槛效应。

Influence of Farm Machinery Input on Agricultural GTFP and the Regional Difference of Threshold Effect

According to the production and marketing of grain, this article divides the country into 3 types of grain function regions. The influence of machinery input on agricultural green total factor productivity (GTFP) and the regional difference of threshold effect were analyzed using fixed effect model and threshold effect model. The results show that: 1) There is regional heterogeneity in the degree of impact of machinery input in 3 grain function regions on agricultural GTFP. Farming machinery input has the largest promoting effect on the improvement of agricultural GTFP in the balanced area of grain production and marketing, next came the main grain area, and the main grain-producing area is the smallest; 2) There is regional heterogeneity in the influence paths of machinery input in 3 grain function regions on agricultural GTFP, farming machinery input in the grain production and marketing balance zone promotes agricultural GTFP by promoting agricultural technical efficiency improvement and agricultural technological progress, farming machinery input in main grain-producing areas promotes agricultural GTFP by promoting the improvement of agricultural technical efficiency, farming machinery input in the main grain marketing area promotes agricultural GTFP by promoting agricultural technological progress; 3) There is a double threshold effect of machinery input on agricultural GTFP in main grain-producing areas, and there is a single threshold effect on agricultural GTFP in main grain area and production and marketing balance area.