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人们常说,林冠能截留雨水,林地枯枝落叶层和土壤能贮容雨水,因而森林有消除或削弱洪水的能力。然而,当森林在有前期降水,林冠截留、林地贮容的水已经饱和的情况下,再遇大雨、暴雨,以至特大暴雨,它还有没有抗洪能力呢? 说森林有抗洪作用,是同裸露地作比较而言的。在同样有前期降雨后再遇暴雨,暴雨发生的时间相同,强度相等,降雨量一样的情况下,有林地与裸露地在雨滴下落的情形,降雨后形成水流的特性是不同的,其抗
It is often said that canopies can retain rainwater, and that the litter layer and soil in woodland can store rainwater, so that forests have the ability to eliminate or weaken floods. However, when the forest is saturated with rainwater, canopy cover and forest land, it still has no flood-fighting capacity even after heavy rains, heavy rainstorms and even heavy rainstorms. In comparison. In the same case of rainstorm after the previous rains, heavy rains occur at the same time, the same intensity, the same rainfall, there is woodland and nudity in the case of raindrops, the formation of water after rainfall characteristics are different, the anti-