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利用人工模拟降雨试验,定量研究了20°陡坡面在不同降雨强度(45,87,127mm/h)、不同下垫面条件(农耕地、裸地和草地)和不同草被覆盖度条件下(80%,60%,40%和20%)坡面的蓄水保土效益。试验结果表明:农耕地产沙量是草地产沙量的21.4～131.5倍,裸地产沙量是草地产沙量的18.3～182.5倍;草地相对于农耕地和裸地的蓄水效益为30.8%～71.8%,保土效益高达94.5%～99.4%;20%草被覆盖度的坡面产沙量分别是40%,60%和80%草被覆盖度坡面产沙量的1.1～1.5倍、1.2～2.9倍和1.3～6.1倍;以20%草被覆盖度的草地为参照区,40%,60%和80%草被覆盖度的草地蓄水效益和保土效益分别为6.0%～80.0%和11.4%～83.5%,草地蓄水保土效益随着草被覆盖度的增加呈增加的趋势。
Using artificial simulated rainfall test, the effects of different 20 ° steep slopes on rainfall intensity (45, 87, 127 mm / h), different underlying surface conditions (farmland, bare land and grassland) %, 60%, 40% and 20%). The results showed that the sediment yield of agricultural land was 21.4 ~ 131.5 times that of grassland, that of bare land was 18.3 ~ 182.5 times that of grassland, that of grassland was 30.8% ~ 71.8%, and the benefit of soil conservation is as high as 94.5% -99.4%. The slope sediment yield of 20% grass cover is 1.1-1.5 times of that of 40%, 60% and 80% 1.2 ~ 2.9 times and 1.3 ~ 6.1 times respectively. The grassland water storage efficiency and soil conservation benefit of 40%, 60% and 80% grass covered by 20% grass coverage were 6.0% ~ 80.0 % And 11.4% ~ 83.5%, the benefits of grassland water and soil conservation increased with the increase of grass cover.