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林木依靠其庞大的树冠、根系和大量的枯枝落叶,拦截降雨,减少地表径流,对改善土壤结构、保持水土有重要作用。树冠像雨伞一样,能截持降雨,减轻雨点对地面的冲击,缓和地表水流,减少雨水对地面的冲刷。据测定,树冠可以截留降雨量的15～30％。这些雨水,一小部分蒸发到空间,其余的经过树叶、枝于层层阻滞,慢慢渗入地表的枯枝落叶层。
Trees rely on its huge canopy, roots and a large number of litter, intercept rainfall, reduce surface runoff, to improve soil structure, maintain water and soil play an important role. Like an umbrella, the canopy intercepts rainfall and reduces the impact of rain on the ground, alleviating surface water flow and reducing the erosion of rainwater on the ground. It is determined that the crown can intercept rainfall 15% to 30%. A small part of these rain water evaporates into space, and the rest passes through the leaves and branches and is stagnant in the layers, slowly infiltrating the litter on the surface of the earth.