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依据塞罕坝华北落叶松放叶期和生长季７个晴天完整的野外分层实测资料，研究了光在林分优势木、平均木和被压木单株树冠中的衰减和吸收过程，比较了林分中不同类型林木的冠结构与光分布规律的关系。研究发现，光在不同类型林木单株树冠中的传递均呈负指数衰减过程，累积吸收率则呈幂函数递增。并就不同冠层对光吸收的贡献与树冠结构动态分析及抚育间伐修枝方面的关系进行了讨论。
Based on the complete field data of seven clear days of Larix principis-rupprechtii and its growing season in Saihanba, the decay and absorption process of light in the canopy of dominant tree, average tree and pressed tree were studied. The relationship between crown structure and light distribution of different types of forest stands was studied. The results showed that the light exponentially decayed in the canopy of different types of tree canopy while the cumulative absorption rate increased exponentially. The contribution of different canopy to light absorption was also discussed in relation to the dynamic analysis of canopy structure and the thinning and pruning practices.