水稻多组分双向反射模型的建立

在作物多组分双向反射模型的基础上，基于辐射传输原理和水稻群丛结构特征，特别是考虑水稻不同生长时期的特点，建立了水稻的多组分双向反射模型。模拟与实测结果的比较表明：模型基本上能反映水稻多组分反射光谱的角度分布特征，特别是较准确地模拟水稻不同生长期，不同太阳天顶角下，“热点”的右移和乳熟期前向反射中的反射高峰点。分蘖期和抽穗期，水稻冠层“热点”效应在水稻各组分的平均倾角约37°左右时达到最大，然后随平均倾角的增大，“热点”效应明显减弱。从数学的角度，模型计算值与实测值通过了t-检验，证明模拟值是可接受的。

Modeling Bidirectional Reflectance of Multicomponent Rice Canopies

Based on the bidirectional reflectance model of multicomponent vegetation canopies and the radiative transfer theory, the bidirectional reflectance model of multicomponent rice canopies was developed considering the features of rice cluster architecture and the different characteristics of rice in its different growth period. The comparison between the calculated and measured values show that the model can basically simulate the angular distribution characteristics of reflectance spectrum of rice canopies. The hotspot effect of rice canopies reached the peak at about 37°, which was the average inclination angle of all components belonging to rice, and then the hotspot effect decreased with the increasing average inclination angle of these components of rice. The results of sensitivity analysis proved that the model is feasible in mathmatics.