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反射测量可用于对作物的水分状况进行快速而经济的评估。该研究以土壤最大持水量为标准,设65%、52%、39%、32.5%、26%和19.5%共6个水处理水平。小麦叶片光反射的测量用数码相机进行,测量结果用L*a*b*颜色系统进行评估和分析。在该三维系统中,参数a*和b*分别描述绿/红和蓝/黄颜色的比例,参数L*用来描述颜色的浅淡。结果表明,随水胁迫加剧,小麦叶片光反射参数a*(绿/红)和/或b*(蓝/黄)在9个特定波段表现出有规律的增加,植株含水率与光反射参数b*之间呈线性负相关关系,其中与510~780nm波段的光反射参数b*之间的决定系数r2最大,达到0.95。因此光反射测量可以作为小麦水分状况测量的一个重要工具。
Reflectance measurements can be used to quickly and economically evaluate the moisture status of crops. Based on the maximum soil water holding capacity, the study set 6 water treatment levels of 65%, 52%, 39%, 32.5%, 26% and 19.5%. Measurement of light reflectance of wheat leaves was performed with a digital camera and the results were evaluated and analyzed using the L * a * b * color system. In this three-dimensional system, the parameters a * and b * describe the proportions of green / red and blue / yellow respectively, and the parameter L * is used to describe the paleness of the color. The results showed that the light reflectance parameters a * (green / red) and / or b * (blue / yellow) of wheat leaves showed a regular increase with the increase of water stress at 9 specific wavelengths. The water cut of plant and light reflection parameter b * Is linearly negatively correlated, with the largest coefficient r2 between the light reflection parameter b * of 510-780 nm and 0.95. Light reflectance measurements can therefore be used as an important tool for measuring the moisture status of wheat.