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林冠截留是林分水量平衡的主要分量之一．通过选取影响樟子松林冠截留的主要因子：雨强、雨量、叶面积指数和雨前枝叶干燥度４个因子，分成５个水平，经正交试验组合，进行了２５场林冠截留实验．通过分析各因子对截留的影响，得出叶面积指数的影响最大，极显著，雨强次之；为此建立了截留量与叶面积指数和雨强关系的模拟方程；在降水量小、叶面积指数较大的情况下，截留量与降水量呈正比，为此建立了截留量与降水量关系的模拟方程．
Canopy retention is one of the major components of the stand volume of water balance. By selecting four factors that affect the interception of Pinus sylvestris var. Mongolica crown, including rainfall intensity, rainfall, leaf area index and branch and leaf dryness before rain, five levels were divided into five levels, and 25 canopy interception experiments were conducted through orthogonal experiment. By analyzing the influence of various factors on the interception, the leaf area index is the most significant and extremely significant, and the rainfall intensity is the second. Therefore, the simulation equation of interception and leaf area index and rainfall intensity is established. Under the condition of large area index, the interception is proportional to the precipitation, so a simulation equation of interception and precipitation is established.