不同水稻品种主要生育期冠层光谱特征分析

Canopy Spectral Characteristics of Different Varieties of Rice during Main Growth Stages

以2个籼稻品种和2个粳稻品种为试材,分析了主要生育期不同品种间水稻冠层光谱反射率差异和同一品种不同生育期水稻冠层光谱反射率的变化趋势。结果表明,在350~750 nm波段品种间光谱反射率差异很小,在750~1 300 nm波段品种间光谱反射率差异随着生育进程的推进开始逐渐减小,每个品种随着生育期的推进光谱反射率有着明显的变化。总体而言,同一时期不同品种间水稻冠层光谱反射率存在一定差异,同一品种不同时期水稻冠层光谱反射率也存在一定差异。因此,在水稻高光谱研究中,应考虑不同品种和不同生育期的影响。

Based on the two indica rice varieties and two japonica varieties, the difference of canopy spectral reflectance between dif- ferent rice in major growth period, and the variation trend of canopy spectral reflectance of different varieties at different growth stages were analyzed. The results showed that the differences of canopy spectral reflectance in 350-750 nm band was very small, but the dif- ferences of canopy spectral reflectance were gradually decreased with the advance of the growth process in 750-1300 nm band. There had obvious difference of canopy spectral reflectance of each variety at the same growth stage, and also had obvious difference of canopy spectral reflectance of the same variety at different growth stages. Therefore, the effects of different varieties and different growth stages should be considered in the hyperspectral study of rice.