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应用地物光谱仪探讨了小麦叶片含水量对近红外 (NIR)波段光谱吸收特征参量的影响。结果表明 :1 65～ 1 85μm间的光谱反射率与小麦叶片的含水量呈显著负相关 ,而且该波段在大气窗口之内 ,受大气层水的干扰较小 ,可作为航空或卫星遥感探测指标应用。根据大量观测数据建立了叶片含水量与吸收深度及吸收面积间的线性相关关系和回归方程式 ,从而提出一种利用光谱反射率诊断小麦叶片水分状况的遥感方法。
The influence of wheat leaf water content on the spectral absorption characteristics of near infrared (NIR) band was discussed by using the surface spectrometer. The results showed that there was a significant negative correlation between the spectral reflectance of 1 65 ~ 1 85μm and the water content of wheat leaves, and this band was less disturbed by the atmospheric water within the atmospheric window and could be used as an indicator of aviation or satellite remote sensing . Based on a large number of observation data, a linear correlation between leaf water content and absorption depth and absorption area was established and a regression equation was established. A remote sensing method using spectral reflectance to diagnose the water status of wheat leaves was proposed.