紫色土丘陵区横坡耕作措施在不同坡度上的水土保持性研究

目的]为紫色土坡耕地的水土保持理论及技术基础上提供科学依据。方法]采用人工降雨的方法,考虑降雨初期和降雨后期水平沟内溢流或者横垄坍塌破坏的横坡垄作的2种状态,从坡度与耕作措施相结合的角度研究紫色土丘陵区在不同坡度上的水土保持性,并针对不同坡度下的水平沟沟底0~30 cm的耕层,分析体积含水量随时间和坡度的变化规律。结果]从水土保持性和耕层含水量变化分析得出横坡措施的水土保持性优于其他措施,且临界坡度在15°~20°。结论]紫色土丘陵区要采取横坡措施。

Research on the Soil and Water Conservation of Purple Soil in Hilly Area through the Cross-slope Farming Measure

Objective] The theory and technical basis for soil and water conservation of purple soil in slope cultivated land was provided.Method] The artificial rainfall being taken and two situations: the run-off in the trench and the collapsed ridge,being considered,the soil and water conservation of purple soil at the different slopes in hilly region was researched from the perspective of the combination of farming measure and slope.The change law of moisture in 0-30 cm cultivated land under the trench at different slopes was analyzed with the variation of time and slope.Result] The farming measure of cross-slope was superior to others in the soil and water conservation based on the research on the soil and water conservation and analysis of water contain in the cultivated land,and the critical slope was at 15°-20°.Conclusion] The farming measure of cross-slope in purple soil hilly region could be adopted.