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中龄山杨林下清除枯落物和原状枯落物（２ｃｍ厚），在天然降雨下分别测定溅蚀量和小区冲刷量，研究枯落物对面蚀的影响。表明有原状枯落物覆盖下不发生溅蚀，清除枯落物有微量溅蚀发生。其侵蚀径流量由有枯落物的０．２５７４ｍ￣３／（１００ｍ￣２·ａ）变为清除枯落物的０．２８２０ｍ￣３／（１００ｍ￣２·ａ），增加了侵蚀径流量８．７２％，有枯落物覆盖地表其侵蚀模数为１．５９１５ｔ／（ｋｍ￣２·ａ）比清除枯落物的林下侵蚀模数３．６２３５ｔ／（ｋｍ￣２·ａ）减少５６．０８％，在山杨林集水区，因原状枯落物保护较好，所以在该流域几乎不发生面蚀。
Under the middle-aged poplars, the litter and litter (2 cm thick) were removed. The amount of splash erosion and the amount of erosion in the plot were measured under natural rainfall to study the effect of litter on the erosion. Show that the original state of littering does not happen under the splash, clear the litter there is a trace of sputtering occurred. The erosion runoff increased from 0.2574 m 3 / (100 m 2 · a) with litter to 0.2820 m -3 / (100 m 2 · a) clearing litter, which increased the erosion runoff 8 .72%. The erosion modulus with litter cover was 1.5915t / (km ~ 2 · a), which was 56% less than the forest erosion modulus with clear litter of 3.6235t / (km ~ 2 · a) .08%. In the Yangling catchment area, due to the better protection of the original litter, almost no surface erosion occurs in this catchment.