稻叶瘟对水稻光谱特性的影响研究

Effects of rice leaf blast on spectrum reflectance of rice

本文通过对 4个感染不同等级稻叶瘟的水稻冠层反射光谱进行测试 ,并对光谱反射曲线进行微分分析 ,研究了绿光区、红光区和近红外区反射光谱的变异特征。结果表明 :绿光区、红光区和近红外区的水稻冠层光谱反射率随病情程度的加重分别呈现下降、上升和下降的趋势 ;绿光吸收边缘的特征波长值发生红移 ,红光吸收边缘和近红外吸收边缘的特征波长值发生蓝移。受害轻时近红外区反射率变化幅度大 ,受害重时绿光区和红光区反射率变化幅度大。本研究为应用遥感技术早期探测稻叶瘟的发生提供了实验依据。

Rice spectrum features at green, red and near infrared regions were studied by measuring and analysing rice canopy reflectance and differential spectrums with 4 levels of rice leaf blast. When rice leaf blast became more serious, the canopy reflectance rate at green, red and near infrared bands was down, up and down, respectively, and the value of character wavelength shifted to red at green absorption edge, and to blue at near infrared and red absorption edges. The reflectance mean range was great at near infrared band under the light infection, but they were great at green and red bands under the heavy infection. The study provided an experimental reference for the early infection forecast of rice leaf blast with remote sensing.