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基于树冠层的结构特征，从方向间隙率定义了冠层中不同空间位置对天空散射入照的开放度及其在冠层中的分布，建立了入射辐射在冠层中的衰减与传输模型。应用对冠层结构、总入射辐射、辐射在冠层中衰减等的野外观测数据，对模型进行了验证。模型成功地解释了光在树冠层中辐射传输的变化规律。
Based on the structural features of tree canopy, the open degree and its distribution in the canopy of different spatial positions in the canopy were defined from the directional porosity. The attenuation and transmission model of incident radiation in the canopy was established. The field observation data of canopy structure, total incident radiation and attenuation of radiation in the canopy were used to verify the model. The model successfully explained the variation of light transmission in the canopy.