中文摘要：

利用野外径流小区观测获得的径流泥沙数据与降雨资料,分析了黔西北地区坡面产流产沙随坡面坡度变化产生的变化规律。结果表明：（1）坡面产流量与产沙量随坡度的增加呈先增大后减小再增大的变化趋势。（2）坡面产流量和产沙量与大雨和暴雨存在显著性相关关系,这2类降雨条件下产流量占总产流量的71.3%-76.5%;产沙量占总产沙量的75.9%-93.8%。（3）坡面产流量与中雨强型侵蚀性降雨显著相关;坡面产沙量与高雨强型侵蚀性降雨显著相关,该类降雨条件下产沙量占总产沙量的46.6%-76.4%。（4）坡面产流产沙与降雨复合因子PI30在不同坡度条件下呈幂函数关系。

英文摘要：

Based on field observations of runoff and sediment generated on runoff plots and rainfall characteristics,the variation rules of slope runoff and sediment with the change of slope gradient in northwest Guizhou were analyzed.The results showed that：（1）Slope runoff and sediment yield showed a trend of increasingdecreasing-increasing with the increase of slope gradient.（2）Slope runoff and sediment yield were significantly correlated with heavy rain and rainstorm events.Runoff and sediment yield under these two types of rainfall conditions accounted for the range of 71.3%to 76.5%of the total runoff yield and 75.9%to93.8% of the total sediment yield,respectively.（3）Slope runoff yield was significantly related to moderate intensity rainfall,whereas sediment yield was significantly related to high intensity rainfall,and 46.6% to76.4% of the total sediment produced under this type of rainfall.（4）Runoff and sediment yield had power function relations with mixed factors of rainfall（PI30）.