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利用美国SE590辐射分光光谱仪在晴天中午对大豆冠层各种辐射光谱成分进行了测定，研究了冠层上方总辐射、反射辐射及基部透射辐射的各种光谱变化规律。结果表明，冠层上方总辐射、反射辐射、基都透射辐射及吸收辐射中光合有效辐射所占百分比分别为47．5％、25．7％、29．6％和80．1％。在此基础上，进一步得出了大豆冠层反射率光谱变化规律，并利用三次样条函数对大豆冠层反射率光谱曲线进行模拟，结果表明256组实测数据组成的反射率──波长曲线可以由12组实测数据通过三次样条函数进行较为准确的模拟，平均模拟误差为4．9％。
Various radiation spectral components of the soybean canopy were measured by the United States SE590 radiation spectrometer at noon on a sunny day. Various spectral changes of total radiation, reflected radiation and base transmitted radiation above the canopy were studied. The results showed that the percentage of total radiation, reflected radiation, base transmitted radiation and photosynthetic active radiation above the canopy were 47.5%, 25.7%, 29.6% and 80.1% respectively. On this basis, the law of spectral reflectance of soybean canopy was further obtained, and the spectral curve of soybean canopy reflectance was simulated by cubic spline function. The results showed that the reflectance of the 256 groups of measured data ─ ─ wavelength curve can From 12 groups of measured data through cubic spline function for more accurate simulation, the average simulation error of 4.9%.