中文摘要：

以垄行结构玉米农作物为例，通过构建玉米平均理念植株进行玉米植株的参数化，解决了不同生长期玉米冠层叶片的空间分布变化问题，构建了适用于全生长期玉米冠层方向孔隙率的计算模型。模型将不同生长期的行播作物的冠层孔隙率计算归纳到同一个近似体质下，以Boolean原理为基础计算冠层的各向孔隙率。通过与RGM模型对不同生长期冠层方向孔隙率计算结果的对比，验证了本模型的计算精度。

英文摘要：

The simulation of canopy porosity have the important meaning for the directivity research of canopy optical reflec- tion and thermal infrared radiation. For the crop planted in line structure, the leaf canopy presents in the form of disperse, line structure and homogeneous distribution in different growth period. Most of researchers use different approximation methods to study the change of the canopy porosity respectively. We take maize crop as an example,and the problem of the distribution var- iation of leaf canopy was solved through structuring and parameterization of the average plant. Based on the average plant con- cept and the boolean theory,we build a canopy porosity model that can apply to all the growth period of the maize crop. Com- pared with the RGM model,the new model developed in this paper has high computational accuracy.