中文摘要：

对WEPP模型预测参数的偏差更易造成预测结果的不确定。检验模型不同预测参数对输出结果的敏感性，为进一步进行参数的调整提供依据，同时对于科学合理地评价预测结果的准确性具有重要的意义。以四川盆地中部遂宁紫色土区为研究区，采用单参数敏感性分析方法，分析了坡度和土壤参数对径流小区产流量与产沙量的敏感性。结果表明：（1）坡度对产流量呈正相关，且对产流量敏感度值表现为15°林地小区（3．993）〉10°农耕地小区（0．133）〉10°果园地小区（0．132）〉15。农耕地小区（0．063），除15°林地小区达到高度敏感外，其他各小区则表现为低度敏感；10°或15°农耕地小区对产沙量不敏感（敏感度值为0．000），仅10°果园小区达到中度敏感（敏感度值为0．531），且相关性表现为正相关；（2）土壤参数中，各因子或与产流量产沙量呈正相关或呈负相关，取决于各因子本身与产流产沙量的相关性；各因子对于不同地类下小区产流和产沙量敏感性差异较大，或高度敏感或不敏感。

英文摘要：

The deviation of predicting the parameters of the WEEP model is more likely to cause the re suits uncertainly. Inspecting the sensitivity of the model is not only providing the basis for the further output results by different prediction parameters of correction of the parameters, but also having impor tant significance to scientifically and rationally evaluate the accuracy of the prediction results. The sensi tivity on the production of runoff and sediment based on slope and soil parameters was studied with single parameter sensitivity analysis method in sunning purple soil area of Central Sichuan Province. The results show as follows ： （ 1 ） the slope had positive correlation with production of runoff, and the sensitivity val ues was 15°forest plot （3. 993） 〉 10° farmland plot （0. 133） 〉 10°orchard land plot （0. 132） 〉 15°farmland plot （0. 063）, in addition to 15 °forest land plot of being highly sensitive, the other each plot was behaved for low sensitive. 10° or 15°farmland plot was not sensitive to production of runoff （ sensi tivity values was 0. 000）, 10° orchard land plot was moderate sensitive （sensitivity values was 0. 531 ） and the relationship was positive. （2） The factor of soil parameters was positive correlation or negative correlation with production of runoff and sediment, depended on the correlation of each factor itself and production of runoff and sediment; the sensitivity of each factor under different kind plot on runoff and sediment quantity was quite different, highly sensitive or not sensitive.