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中文摘要：
降雨侵蚀力是反映由降雨引起土壤侵蚀的潜在能力,是土壤侵蚀模型的重要因子。降雨侵蚀力指标就黄土高原,不同的学者提出不同的指标。雨型对土壤侵蚀影响很大,根据降雨特性分为三种雨型,通过对黄土丘陵沟壑区岔巴沟流域降雨的最大时段雨强与能量的乘积EIt与土壤侵蚀模数直线回归,并对各个相关性系数r之间进行了显著性分析表明,研究区所有雨型条件下从rEI10到rEI60各rEIt之间没有显著性差异;短阵型雷暴雨（A型雨）rEI10与rEI30没有显著性差异但与rEI40有显著性差异,锋面夹雷暴雨（B型雨）其rEI10与rEI100中各rEIt都没有显著性差异。因此,认为黄土丘陵沟壑区的降雨侵蚀力指标EI10到EI30各EIt都可以采用,并且可以被相应简易因子PIt替代。
英文摘要：
Rainfall erosivity is a reflection of potential soil erosion caused by rainfall and an important factor of soil erosion models.Different scholars put forward different index for rainfall erosivity on the Loess Plateau.To check the influence of rainfall on soil erosion,rainfall patterns are classified into three types according to rainfall characteristics.Linear regression between EI_t（maximum period of rainfall intensity and energy product） and soil erosion modulus within Chabagou watershed in a hilly loess region of the Loess Plateau is first analyzed.Then all coefficients of correlation r significance are tested.The results show that there is no significant difference from r_（EI10） to r_（EI60） for all rain patterns in the study area.For short thunderstorm（rain pattern A）,there is no significant difference from r_（EI10） to r_（EI30）,but significant difference between r_（EI10） and r_（EI40）. There is no significant difference from r_（EI10） to r_（EI100） for frontal rain mixed short thunderstorm（rain pattern B）.Therefore,every EI_t from EI_（10） to EI_（30） can be used as the rainfall erosivity, and can be substituted by the corresponding simple factor PI_t.
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