农地细碎化、耕地质量对水稻生产效率的影响

Impact of Land Fragmentation and Land Quality on Rice Production Efficiency and Its Regional Difference

农地细碎化和耕地质量是影响农业产出及其效率的两个重要因素,且二者之间相互影响.基于湖北省武汉都市圈775份水稻种植户调查数据,选取块均面积、地块数量和地块间的平均距离作为衡量农地细碎化程度的指标,根据地貌差异将调查样本分为岗地平原区和低山丘陵区2组,通过构建4种不同形式的随机前沿生产函数和效率损失函数,聚焦于农地细碎化和耕地质量的不同组合对水稻产量和技术效率的影响及其区域差异.结果表明:农地细碎化对岗地平原区水稻产量和技术效率的影响为负但并不显著,对低山丘陵区水稻产量和技术效率的影响为正但也不显著;耕地质量对岗地平原区和低山丘陵区水稻产量和技术效率的影响均显著为正;农业收入比例、人均年纯收入和商品率对技术效率的影响显著为正.利用农地细碎化单项指标即块均面积、地块数量和地块间的平均距离分别替代农地细碎化综合指数开展稳健性检验,证实本文的主要研究结果具有相当的稳健性.

Land fragmentation and land quality are two important factors affecting agricultural output and efficiency,and the two variables interact with each other.Based on the survey data collected from 775 farmers in Wuhan metropolitan area in Hubei province and selecting the average size of plots,the number of plots and the average distance between plots as indicators of land fragmentation,this paper analyzes the impact of land fragmentation and land quality on rice yield and technical efficiency and its regional difference.All the samples are divided into two groups according to landform types and four different forms of stochastic frontier production functions and technical efficiency loss functions are constructed.he results indicate that:(1)Land fragmentation has a slightly negative impact on rice yield and technical efficiency in hillock and plain area,yet a slightly positive impact on rice yield and technical efficiency in low mountain and hilly area.(2)Land quality has a significantly positive impact on rice yield and technical efficiency both in hillock and plain area and low mountain and hilly area.(3)Agricultural income ratio,per capita annual income and commodity rate have significantly positive impacts on technical efficiency.The three single indicators of land fragmentation are used to carry out robustness test,replacing the previous comprehensive index.It is confirmed that the main results are considerably robust.