在二向反射物理模型的反演研究中,李小文和Strahher等提出基于知识的反演,强调了地面知识积累对反演的重要性。根据在北京、山东禹城和河北亲城等地不同年份积累的不同品种冬小麦实测数据,按照二向反射理论模型及模型反演研究的要求,分析了冬小麦群体植被组分的几何结构、光学特性和土壤光学特性等参数的季相变化特征。具体内容包括;(1)叶面积指数的季相变化;（2)叶、茎、穗面积在它们总面积中比例的季相变化;(3)叶倾角分布的季相变化;(4)叶茎穗光学特性的季相变化(5)土壤背景垂直向上反射率的季相变化,文中各项季相变化特征覆盖的冬小麦生育期长。这是一份比较系统和有较好代表性的结果。

In the study of inversion of BRDF physical models Li and Strahler presented an option of inversion based onthe priori knowledge. They emphasized that to accumulate the knowledge of ground objects is important. For thepurpose of the requirement of study of BRDF physical model and the model inversion, in this article, based on thedata collected in the field experiments on different varieties of winter wheat, in Beijing, Luan Cheng of Hebei Provinceand Yu Cheng of Shandong Province in different years, the seasonal change of geometry and optics of foliagecomponents and the optics of soil background are presented. It consists of the following five contents. (1) the seasonalchange of leaf area index, (2) the seasonal change of ratio of leaf area, stem area and ear area to the sum area of thesethree foliage components, (3) the seasonal change of leaf inclination, (4) the seasonal change of optics of leaf, stem andear, (5) the seasonal change of upward reflectance of soil background. It is a set of representative results in coverage ofmain growing period, of different varieties of winter wheat in the middle part of North China Plain.