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以地物谱仪作为核心的数据采集平台采集光谱数据后通过计算机进行处理拟合,利用光谱分析软件ViewSpecPro,辅助以Excel、SPSS等数据统计软件进行光谱数据反演,探究柑橘树冠层光谱的4种形式与叶面积指数(leaf area index,LAI)的相关性,从而利用相关性最高的光谱参数对LAI进行定量化模拟估算和实时采集。结果表明,LAI与光谱信息系数NDVI、ρ550的反射能量、ρ850的反射能量、一阶导数、红边幅值、红边面积等的拟合方程相关系数(R)分别为0.886、0.906、0.871、0.912、0.798、0.870,相应方程的显著水平P<0.05。NDVI、红边幅值和红边面积与LAI都达到较高的相关水平,可以对柑橘树冠层LAI进行模拟估算。
Spectral data was collected by using the spectrometer as the core data acquisition platform and then processed by computer. Spectral analysis was performed using Spectral analysis software ViewSpecPro and spectral data inversion software Excel, SPSS and other data statistical software to explore the spectral structure of citrus canopy spectrum 4 The correlation between species forms and leaf area index (LAI) was used to quantitatively estimate LAI and acquire them in real time using the most relevant spectral parameters. The results show that the correlation coefficients (R) of the fitting equations between the LAI and the spectral information coefficients NDVI, ρ550, the reflected energy ρ850, the first derivative, the red edge amplitude, the red edge area are 0.886, 0.906, 0.871, 0.912,0.798,0.870, the corresponding level of the significant level of P <0.05. NDVI, red edge amplitude and red edge area all reached higher correlation with LAI, which could simulate the LAI of citrus canopy layer.