基于MODIS EVI时间序列的冬小麦长势监测

该文探讨了MODIS EVI序列与作物生长过程的互动规律,利用EVI序列分析影响冬小麦生长过程的气象因素。结果显示,冬小麦抽穗期EVI值及冬小麦返青期至收获期EVI积分值与作物产量之间有很好的相关性。冬小麦抽穗期EVI值与冬小麦产量的相关性体现了作物营养生长阶段的发育状况,可以利用抽穗期作物EVI早期预测作物产量;EVI曲线的积分值能综合反映作物整个生长发育过程,可以根据这一规律对农作物产量进行估算。冬小麦生育期内EVI均值与平均温度、降水量、日照时数相关性分析结果显示,温度和降水是冬小麦生长的主要限制因子,其中温度起主导作用。

SUPERVISION AND TESTING ON THE GROWTH OF WINTER WHEAT GROWN BASED ON MODIS EVI TIME SEQUENCE

This paper discusses about the mutual act rule between MODIS EVI sequence and crop growing process,and analyzes the weather factors influencing the growing process of winter wheat by EVI sequence.Results show the EVI value during heading period of winter wheat and the EVI accumulated value from turning green to harvest period of winter wheat possess good relativity with crop yield.The relativity between the EVI value during heading period of winter wheat and the yield of winter wheat embodies the growth status during crop nutritional growing period.The EVI value during heading period of winter wheat can be used to forecast the crop yield.The EVI accumulated value can comprehensively reflect the entire crop development process.We can also estimate crop yield according to this rule.The analysis on the relativity between average EVI values within winter wheat growing period and average temperature,rainfall,hours of sunshine shows that temperature and rainfall are the main limiting factors,among them temperature plays the leading role.