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林地对于保持水土具有重要的作用，关键在于林地对降雨的再分配作用。本交通过五年的林地降雨分配规律观测发现，在油松林林龄35年，郁闭度80％的情况下，林内透流雨量占降雨量的87．73％，树干茎流量占1．83％，林冠截持损失量占10．44％。30年生刺槐林，郁闭度65％，林内透流雨量占降雨量的92．86％，树干茎流量占4．28％、林冠截持损失量占2．86％。且林内透流量，树干茎流量及林冠截持损失率均与空地降雨量有一定的规律。从而为进一步探讨水土流失规律提供了科学依据。
The key role of woodland in maintaining soil and water plays an important role in the redistribution of rainfall to the forest. The five-year observation and comparison of rainfall distribution patterns of forest land showed that in the case of Pinus tabulaeformis forest age of 35 years and canopy density of 80%, the trans-flow rainfall in the forest accounts for 87.73% of the rainfall and the trunk flow accounts for 1.83 %, Canopy intercept loss accounted for 10.44%. The 30-year-old Robinia pseudoacacia forest has 65% canopy density, 92.86% of rainfall, 4.28% of trunk stem flow and 2.86% of canopy interception loss. In addition, the amount of transpiration, loss of trunk stem flow, and loss of canopy interception are all related to the amount of rainfall. Thus providing a scientific basis for further studying the law of soil and water loss.