沟灌土壤侵蚀控制效应的室内模拟试验研究

Laboratory Simulated Experiments on Control Over Furrow-Irrigation Induced Soil Erosion

灌溉地土壤侵蚀问题已经越来越引起人们的普通关注。该文采用微型水槽的室内模拟试验 ,对利用 PAM及波涌灌溉等技术减少沟灌引起的土壤侵蚀效果进行了试验研究 ,分析了在不同坡度、不同流量条件下 PAM及灌溉间歇时间对侵蚀的影响。结果表明 :PAM可显著减少沟灌土壤侵蚀量 ,地面坡度是地面灌溉土壤侵蚀最主要影响因素 。

Soil erosion in irragated land is becoming a more and more interested problem to people in the world. Simulated laboratory experiments with mini flume were conducted to study the influences on furrow irrigation induced soil erosion of typical soil from Hetao Irrigation Scheme, Inner Mongolia. From the mini flume experimental data, the impacts of PAM and interruption time on reduction of soil erosion under influences of slope grade and inflow rate were quantitatively analyzed. The results show that PAM can reduce soil erosion in irrigated land greatly, and the land slope is the most important factor to soil erosion in surface irrigated land. While the flow rate of irrigation water into furrow and off time of surge irrigation are not very effective factors on it.