中文摘要：

为探究多年从事精准作业后作物产量的时空变异情况,对近10年从事精准作业历史的吉林省榆树市十三号村的农用土地的单元格内玉米的产量做空间分析和时间对比研究。通过多种方法比较研究发现,经过多年的精准作业后,其单元格内作物产量的变化趋势趋于平稳,其变异系数逐年减少,变异系数均低于20%,属于中等变异,产量的空间变化频率也逐年减弱。

英文摘要：

In order to explore maize yield of spatial and temporal changes after several years＇precision operation,temporal and spatial analysis was done with the corn yield in cells,data is from No.13 village agricultural land,at Yushu city of Jilin Province which has nearly 10 years precision operation history.Through the comparison of several methods,the change trend of corn production in the cell was found to be stable.Variation coefficient decreases year by year,and lower than 20%,which belonged to medium variation.At the same time,spatial variation also weakens gradually.