中文摘要：

采用室内人工模拟降雨试验,设计降雨强度100 mm/h,坡度20°,在2个玉米秸秆缓冲带布设坡位（斜坡长4.5-5.5 m和6.5-7.5 m）与2个降雨历时（单次降雨30 min和2次连续降雨30 min＋30 min）的试验处理组合,研究在黄土坡面不同坡位布设玉米缓冲带对防治细沟侵蚀的影响。结果表明：1）玉米秸秆缓冲带可减少坡面侵蚀量和细沟侵蚀量,其中,坡面侵蚀量减少7.3%-14.2%,细沟侵蚀量减少11.0%-30.6%,细沟侵蚀量对坡面侵蚀的贡献率减少3.4%-15.0%,径流含沙量降低5.5%-12.8%;2）单次降雨情况下在斜坡长4.5-5.5 m处布设玉米秸秆缓冲带防治侵蚀的效果最佳,坡面侵蚀量、细沟侵蚀量和径流含沙量分别减少14.2%、30.6%和11.6%,细沟平面密度和细沟平均深度分别减少12.9%和21.9%;3）2次连续降雨情况下在斜坡长6.5-7.5 m处布设玉米秸秆缓冲带防治侵蚀的效果较好,坡面侵蚀量、细沟侵蚀量和径流含沙量分别减少13.5%、25.0%和5.5%,细沟平面密度和细沟平均深度分别减少15.5%和16.3%。

英文摘要：

Simulated rainfall experiments were conducted to study the effects of maize straw buffers laid on different slope positions in preventing rill erosion on loess slope. Experimental treatments include two slope positions（4. 5- 5. 5 m and 6. 5- 7. 5 m distance to the top） under a single simulated rainfall and two successive simulated rainfalls with the rainfall intensity of 100 mm / h and slope gradient of 20°. The results showed that under different maize straw buffer treatments,total erosion amount decreased by7. 3%- 14. 2%,rill erosion amount by 11. 0%- 30. 6%,sediment concentration by 3. 4%- 15. 0%and proportion of rill erosion to total erosion amount by 5. 5%- 12. 8%,respectively. Among all treatments,the best way to prevent rill erosion under the single simulated rainfall was to establish maize straw buffer in the middle slope（at 4. 5- 5. 5 m distance to the top）; the total erosion amount,rill erosion amount,sediment concentration,rill horizon density and rill average depth decreased by 14. 2%,30. 6%,11. 6%,12. 9% and 21. 9%,respectively. Under two successive simulated rainfalls,maize straw buffer should be established at the lower slope（6. 5- 7. 5 m distance to the top） for better prevention effect; the total erosion amount,rill erosion amount,sediment concentration,rill horizon density and rill average depth decreased by 13. 5%,25. 0%,5. 5%,15. 5% and 16. 3%,respectively.