通过原状土槽冲刷法研究比较了干热河谷冲沟发育区6个层位土体抗冲性变化过程及差异。结果表明，（1）各层土体抗冲性均随冲刷时间呈幂函数增大（除第Ⅳ、Ⅴ层土体因裂隙的存在而在冲刷前期表现为抗冲性能随冲刷时间呈线性增加外）；（2）不同层位土体初始抗冲性差异显著，依次为Ⅰ层＞Ⅱ层＞Ⅵ层＞Ⅲ层，Ⅳ层＞Ⅴ层；（3）土体抗冲性随土层深度的增加呈旋回式减小，具体表现为：Ⅰ层＞Ⅱ层＞Ⅲ层，Ⅳ层＞Ⅴ层＞Ⅵ层，其中，Ⅰ层和Ⅳ层冲刷模数较为接近。该研究结果可为揭示冲沟发育过程及其机理奠定基础，为冲沟侵蚀治理措施制定提供科学依据。

Abstract:Anti-scourability of undisturbed sampling soil taken fromsix different horizons in gully developed area of dry-hot valley region is analyzed and compared in this study. The result shows that: (1)the soil anti-scourability of each horizon increasesin a power function with the scouring time except the earlier stage of Layer Ⅳ、Ⅴ, which is increased in a linear function for the  existence of fissure. (2)There were significant differences insoil anti-scourabilityamong each horizon, which performs as: LayerⅠ＞LayerⅡ＞ layerⅥ＞LayerⅢ，LayerⅣ＞LayerⅤ. (3)the soil anti-scourability increases with the depth of each horizon in a gyratory function, which performs as: LayerⅠ＞LayerⅡ＞LayerⅢ，LayerⅣ＞LayerⅤ＞LayerⅥ. Finally, The results of this study can provide a basis for revealing gully development process and mechanism. It can also provide a scientific basis for controlling gully erosion.