造成黄土高原水土流失的降雨主要是短历时暴雨。根据这一特点，利用人工模拟降雨方法研究了短历时暴雨条件下沙棘林的减水减沙效益，以及不同郁闷度对产流产沙过程的影响。结果表明，沙棘林郁闭度越高，减水减沙效益越好。在设计暴雨条件下，荒坡径流量、侵蚀量分别高达39860m3／km2、736．64t／km2，而郁闭度0．7的沙棘林径流量、侵蚀量分别为4790m3／km2、8．37t／km2，比荒坡分别减少87．98％和98．86％。沙棘林的有效郁闭度确定为0．5。 The rainfall that caused the soil and water loss in the Loess Plateau is mainly short-term heavy rainfall. According to this feature, the effect of reducing water and sediment of seabuckthorn forest under short-term heavy rain conditions and the effect of different depressions on runoff and sediment yield were studied by artificial simulated rainfall method. The results showed that the higher the closed degree of seabuckthorn canopy, the better the benefit of water and sediment reduction. Under the condition of heavy rain, the runoff and erosion amount of the barren slope were up to 39860m3 / km2 and 736.64t / km2, respectively. The runoff and erosion amounts of seabuckthorn forest with canopy density 0.7 were 4790m3 / km2 and 8.37t / km2, 87.98% and 98.86% less than the barren slope respectively. The effective canopy density of seabuckthorn forest is determined to be 0.5.