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在天然降雨情况下，利用自制自记装置，对油松、侧柏和灌木林的林冠截留降雨过程及截留量进行了观测。结果表明：油松林的截留量最大，灌木林次之，侧伯林最小。年截留率为２０％～３３％，截留强度与降雨强度呈正相关。林冠截留过程表示为：Ｉｔ＝Ｉｃ＋（ｆＩ０兄－Ｉｃ）ｅ－αｔ （ｆ≠０）。用实测数据确定出截留公式的特征值及参数，经检验与实际过程有良好的一致性。
In the case of natural rainfall, canopy interception rain process and interception of Pinus tabulaeformis, Platycladus orientalis and shrubbery were observed by self-made self-recording device. The results showed that the Pinus tabulaeformis forest had the largest interception rate, followed by the shrub forest and the minor forest. Annual retention rate of 20% to 33%, interception and rainfall intensity was positively correlated. Canopy interception process is expressed as: It = Ic + (fI0 brother-Ic) e-αt (f ≠ 0). The measured data are used to determine the eigenvalues and parameters of the interception formula. The results show good agreement with the actual process.