红壤团聚体特征与坡面侵蚀定量关系

为明确红壤结构特征对坡面侵蚀过程的影响，选取6种典型红壤为研究对象，通过团聚体稳定性分析和野外原位人工模拟降雨试验，就红壤团聚体稳定性特征与坡面侵蚀过程定量关系进行了初步探讨。结果表明：在野外尺度上，红壤团聚体稳定性是影响坡面侵蚀的重要因素；能定量描述土壤可蚀性的团聚体特征参数Ka，与径流强度、产沙强度等侵蚀参数显著相关；将Ka代入WEPP模型，建立了细沟间侵蚀预测方程，方程可决系数较高（R2＝0.86），显示了较好的预测性能。该研究扩展了团聚体稳定性作为土壤可蚀性指标的适用范围，为红壤侵蚀机理研究提供了新思路。

Quantitative relationship between aggregate characteristics of red soil and slope erosion

In order to determine the effect of structure characteristic of red soil on slope erosion, the relationship between aggregate characteristic of red soil and slope erosion was preliminary studied based on the analysis of aggregate stability and the simulated rainfall experiment in field. Six typical red soils were chosen for the study. The results showed that the aggregate stability of red soil was the important factor effecting slope erosion in field. The aggregate characteristic parameter Ka which could quantitatively describe soil erodibility showed a significant correlation with the runoff intensity and sediment-yield intensity. By introducing Ka into the WEPP (Water Erosion Production Project) model, the erosion prediction equation was established with a good correlation coefficient (R2 = 0.86). The equation showed a good prediction performance. The study extends the scope of application of the aggregate stability as soil erodibility index, and provides a new way to revel the erosion mechanism of red soil.