依据1985与1994两个年份的分县粮食生产统计数据,运用GIS为分析手段,从空间变化特征、变化成因及变化趋势三个方面,着重对1984年以来我国粮食单产的空间变化进行了定量研究。结果表明:在过去十年里,我国粮食单产增长占绝对优势,其中北方地区增产强度较大、南方地区下滑现象明显;生产条件的改善对北方粮食单产的增长有重要作用,比较利益的驱使导致南方粮食单产下滑。

Using GIS as an analyzing tool, the characteristics, reasons, and trends of spatial variation of China’s grain yield are studied quantitatively based on the national grain production database ( by county unit ) in two periods (in 1985 and 1994). The result is that the increase of China’s grain yield in the past decade was very obvious, especially in north area, while the decrease of grain yield was exist in some of the south area of China. The increase of grain yield in north area was mainly come from the improvement of grain production condition while the decrease of grain yield in south area was driven by the comparison profits.