中文摘要：

为明确红壤结构特征与抗剪强度对坡面土壤分离能力的影响，选取8种典型红壤为研究对象，通过团聚体稳定性分析，饱和抗剪强度测定，和室内模拟冲刷试验，就各参数间定量关系进行了初步探讨。研究结果表明：团聚体稳定性特征参数As集合了红壤团聚体破碎的主要机制，与不同水流剪切力中红壤分离速率有较好的相关性；红壤饱和抗剪强度（σs）与集中水流内临界水流剪切力（τc）呈较好的线性关系。基于WEPP细沟侵蚀模型，将团聚体稳定性特征参数As代替可蚀性因子Kc，饱和抗剪强度（σs）代替临界水流剪切力（τc），得出新的预测方程。结果显示预测方程能准确的预测坡面集中水流内红壤分离速率（R2=0．8871）。该结果为深入研究红壤侵蚀机理提供了新思路，对完善侵蚀物理过程模型具有重要的意义。

英文摘要：

In order to determine effects of structure characteristics and shear strength of red soil on soil detachment, relationships of soil detachment rate with soil aggregate characteristics and shear strength of the red soil were studied through indoor simulated erosion experiment with concentrated flows. Eight typical types of red soils were chosen for the study. Results show that aggregate stability index （As） integrated main mechanisms of aggregate breakdown, and was found to be well related with soil detachment rate under different flow shear stresses; A positive linear relationship was observed between saturated soil shear strength （σs） and critical flow shear stress （τc） in concentrated flow. By introducing As and σ, into the WEPP （Water Erosion Production Project） model of rill erosion, a prediction equation of red soil detachment rate was established with a good correlation coefficient （R2 = 0. 887 1 ）. The study provides a new approach to research on erosion mechanisms of red soil, which is of great significance to perfection of the physical process model of soil erosion.