重庆市粮食单产及均衡增产潜力空间分异

以县域为基本研究单元,利用变异系数、泰尔指数、ESDA方法和区域粮食增产潜力测算,探究粮食单产空间差异变化及空间格局演变,并在此基础上进行粮食均衡增产潜力分析。结果表明:(1)2000~2014年间,重庆市粮食单产变动态势呈现"V"型,2007年单产水平最低。(2)重庆市粮食单产总体差异呈缩小趋势,总体差异贡献度为一小时经济圈渝东北区渝东南区,区域差异为渝东北区一小时经济圈渝东南区。(3)研究期间,粮食单产存在明显的空间集聚特征。(4)重庆市可划为3个一级、8个二级均衡增产类型区,粮食单产增产潜力为一小时经济圈渝东北区渝东南区,总增产潜力表现为渝东北区一小时经济圈渝东南区,全市总增产潜力为4.20×10~6 t。

Spatial Difference of Grain Yield per Unit Area and Equilibrium Increasing Yield Potential in Chongqing

The basic research unit at the county level,the variation coefficient,Theil index,ESDA method and regional grain production potential estimation,to explore the change and the spatial pattern of differences in grain yield spatial evolution,and analyzes the grain equilibrium yield increasing potential.The results showed that:(1) during 2000 to 2014,the variation trend of unit area grain yield showed a V shape,the lowest level of yield per unit was in 2007.(2) The overall difference of grain yield per unit in Chongqing was decreasing,the contribution to the overall difference could be sorted as one hour economic circle,northeast area of Chongqing,southeast Chongqing;regional difference could be sorted as northeast area of Chongqing,one hour economic circle,southeast Chongqing.(3) During the study period,there were obvious spatial agglomeration characteristics of grain yield.(4) Chongqing city can be divided into threelstlevel,eight 2ndlevel equilibrium increasing production area,grain yield increasing potential could be sorted as one hour economic circle,northeast of Chongqing area,southeast Chongqing area;the total increasing yield potential could sorted as northeast of Chongqing area,one hour economic circle,southeast Chongqing area,the city's total increasing yield potential is 4.20 × 106 t.