中文摘要：

黄土丘陵区严重的水土流失是制约该区农业可持续发展的主要问题。近年来,退耕还林草政策使得该区枣树面积大幅增长,但不合理的枣园管理制度（清耕制）更加剧了水土流失等自然灾害。采用模拟试验手段,研究了枣树枝全园覆盖,白三叶全园、行间生草及行间生草＋冠下枣树枝覆盖处理下坡面径流、泥沙过程,对径流量、泥沙量与盖度的关系及径流与泥沙关系进行了定性定量分析,探讨了适宜的径流-泥沙调控措施。结果表明,枣树枝及生草覆盖显著推迟了坡面径流产生的时间,且对坡面径流量及泥沙量有显著调控效应,以白三叶全园生草效果最佳。径流量与泥沙量随坡面覆盖度的增加呈指数型减小趋势。径流量与泥沙量散点分析表明二者呈非常好的线性关系,清耕处理下泥沙量较其他处理随径流量增大增加的更快。综合考虑,白三叶全园生草径流泥沙调控能力强,为该研究尺度下最优的坡面覆盖措施。

英文摘要：

The severe soil erosion is the main barrier for sustainable agriculture development in Loess hilly region .Recently ,the area of jujube in this region rose rapidly as “farmland to grass land” policy ,however ,the natural hazards especially soil erosion was ag‐gravated due to unsuitable jujube orchard management （clean cultivation） .This paper studied the runoff-sediment process under the treatments of whole ground jujube branches mulch ,white-clover cover ,strip white-clover cover ,strip white clover cover ＋ branches mulch beneath the tree ,besides ,the relationship between runoff amount ,sediment amount and coverage was analyzed qualitatively and quantitatively ,the suitable runoff-sediment regulation measure was also discussed .The results indicate that branches mulch and vegetation cover significantly postponed the time for runoff occurring and affected slope runoff and sediment ,white clover showed the best effects .The runoff and sediment declined with slope coverage increase by exponential curve .The scatters between runoff and sediment showed a significant linear relation ,sediment under clean cultivation increased sharper with runoff rise than under others . Comprehensively ,white clover cover is considered to be the best measure at such scale with its excellent regulation ability on runoff sediment .