土地细碎化对粮食生产规模报酬影响的量化研究——基于江苏省盐城市、徐州市的实证数据

论文基于江苏省农户实地调查数据,以江苏省粮食产量前两位的地级市盐城、徐州为例,建立Trans-log函数,分别计算土地细碎化线性指标、对数指标下各投入要素的产出弹性,通过计算产出弹性加总后的规模报酬系数考察江苏地区粮食作物生产的规模经济性。实证结果表明：1）在考虑土地细碎化的影响后,盐城、徐州粮食生产总体上不存在明显的规模报酬递增;2）土地仍然是最重要的生产要素;3）土地细碎化对于粮食生产的规模报酬具有负影响;4）土地细碎化对不同地区的粮食产量存在正负两方面的影响。基于研究结论,研究认为在促进农村剩余劳动力转移的前提下,应该对土地细碎化现象的负面效应给予更多重视。

Quantitative Research of the Impact of Land Fragmentation on Scale Returns of Grain Production—Based on Empirical Data of Yancheng City and Xuzhou City in Jiangsu Province

The issue of grain production has always been the focus point of governments and academics. In the paper, we explore the impact of land fragmentation on grain production. Taking the field survey data from farmers in Yancheng and Xuzhou, top two cities of crop yields in Jiangsu Province, as examples, the paper establishes Trans-log function model to weigh the existence of returns to scale. By calculating yield flexibilities of input factors with linear index and logarithmic index of land fragmentation respectively, the paper adds the output elasticity to get the coefficient of returns to scale. Then we get a number which does not differ significantly from 1. The result shows that there is no obvious increasing returns to scale in general when considering the effect of land fragmentation. And the output elasticity of land which is around 0.8 means that land is still the most important factor of production. Furthermore, land fragmentation will do harm to returns to scale of crop production, but it has both positive and negative impacts on grain yield in different regions. So, it is proposed that on the premise of promoting the transfer of rural surplus labor, government should pay more attention to the negative effects of land fragmentation.