【摘要】 根据纸坊沟流域土壤侵蚀制图和多年径流泥沙观测资料 ,在阐明该流域土壤侵蚀特征的基础上 ,对比分析了“六五”、“七五”、“八五”和“九五”各治理期间流域输沙量的变化 ,重点定量评价了‘八五’和‘九五’期间降雨衰减影响和综合治理影响在流域输沙量减少中的作用。降雨衰减影响占 1 3;而综合治理影响占 2 3。更多还原

【Abstract】 Based on soil erosion mapping and observed data of long_term runoff and sediment from Zhifanggou watershed, soil erosion characteristics in Zhifanggou watershed were addressed, and variations of sediment yield from Zhifanggou watershed at different periods 1981～1985, 1986～1990, 1991～1995, 1996～2000 were analyzed. Contributions of rainfall decreasing and watershed comprehensive controls to the reduction of watershed sediment delivery were respectively estimated. The results showed that the contribution of rainfall decreasing to the reduction of sediment delivery occupied 1/3, and the contribution of watershed comprehensive control to the reduction of sediment delivery accounted for 2/3.更多还原