灌浆期小麦倒伏后光谱变化特征

目的]研究灌浆期小麦倒伏后的光谱变化特征。方法]通过人工模拟小麦灌浆期的倒伏现象,采用光谱仪测量倒伏小麦的光谱反射率,分析了冠层光谱变化的原因及特征。结果]小麦倒伏越严重,植株光谱变化特征越明显。小麦倒伏后,其冠层光谱反射率整体增大。其中,灌浆前、中期5级倒伏小麦在近红外波段的反射率最高。随着时间的推移,正常生长和倒伏的小麦冠层光谱反射率发生了同样的变化。结论]该研究为使用遥感影像监测目标区域、获得倒伏面积及受灾程度提供了理论基础。

Spectral Variation Characteristics of Wheat Lodging in the Filling Period

Objective] The research aimed to study the spectral variation characteristics of wheat lodging in the filling period.Method] By artificially simulating the wheat lodging phenomenon in the filling period,measuring the spectral reflectivity of lodging wheat with the spectrometer,the variation reason and characteristics of canopy spectrum were analyzed.Result] The more serious the wheat lodging was,the more obvious the plant spectrum variation characteristic was.The canopy spectral reflectivity of lodging wheat increased,and the reflectivity of 5-level lodging wheat in the prior and middle periods of filling near the infrared band was the highest.As the time passed,the canopy spectral reflectivity of wheat which grew normally and lodged had the same variation.Conclusion] The research provided the theory basis for using the remote sensing image to monitor the objective zone,gain the lodging area and the affected degree.