橡胶树叶片高光谱特征分析

从光谱曲线特征和光谱变换特征分析橡胶树(Hevea brasiliensis)叶片反射曲线特征.结果表明,蓝边、红边、黄边位置特征分别出现于525 nm、725 nm、550 nm波段附近,红谷位置特征变化较大,并提取了红边积分面积等重要光谱变量特征.叶片氮含量与反射光谱的相关分析表明橡胶树叶片氮素敏感波段为700～1300 nm,其中730 nm处相关性最好,达到0.8422的极显著水平,以730 nm处的反射率与叶片氮含量建立线性模型,其复相关系数R2达到0.7094.

The Analysis of Hyperspectral Characteristics of Rubber Leaves

The reflectance characteristics of Hevea brasiliensis leaves were analyzed by using spectral curve and transform features. The results showed that the positions of blue edge, red edge and yellow edge were appeared at near 525 nm, 725 nm and 550 nm, respectively. The correlation between the reflectance spectral data and nitrogen content in rubber leaves was significant within the sensitive waveband (700~1300 nm), which correlation coefficient was the highest (r=0.8422) at the most sensitive waveband (730 nm). The linear regression between the reflectance spectral data and the nitrogen contents was established with the multiple correlation coefficient (R2) at 0.7094.