聚丙烯酰胺对凹凸型坡土壤侵蚀影响的室内试验
发布时间：2019-03-13 13:45
【摘要】：通过室内人工模拟降雨试验,研究了聚丙烯酰胺(polyacrylamide,PAM)施用量(0、0.5、1.0和2.0 g/m2)对凸型坡(上、下坡坡度分别为5°、10°、15°和20°、25°)和凹型坡(上、下坡坡度分别为20°、25°和5°、10°、15°)土壤侵蚀规律的影响。结果显示,无PAM应用时,凹型坡或小坡度凸型坡(上坡坡度为5°)径流含沙量随降雨历时逐渐减小,而大坡度凸型坡(上坡坡度≥10°)径流含沙量在降雨过程中会急剧增大。凸型坡平均土壤流失量是凹型坡的8.4倍。PAM应用显著增大了凹型坡和小坡度凸型坡径流含沙量和土壤流失量(P0.05),但减小了大坡度凸型坡土壤流失量。PAM应用后,土壤流失量与坡度大小无明显关系,此时凸型坡平均土壤流失量为凹型坡的1.2倍。在生产实践中PAM可用于控制较陡(≥10°)凸型坡的土壤流失。
[Abstract]:The effects of polyacrylamide (polyacrylamide,PAM) application (0, 0.5, 1.0 and 2.0 g/m2) on convex slopes (upper and lower slopes are 5 掳, 10 掳, 15 掳and 20 掳, 25 掳, respectively) and concave slopes (upper, lower, 10 掳, 15 掳and 20 掳, 25 掳, respectively) are studied by artificial rainfall simulation in laboratory. The effect of downslope slope on soil erosion law is 20 掳, 25 掳and 5 掳, 10 掳, 15 掳, respectively. The results show that in the absence of PAM, runoff sediment concentration decreases with rainfall duration on concave slope or small slope (up slope is 5 掳), while sediment concentration in large slope and convex slope (upper slope 鈮，
本文编号：2439439
[Abstract]:The effects of polyacrylamide (polyacrylamide,PAM) application (0, 0.5, 1.0 and 2.0 g/m2) on convex slopes (upper and lower slopes are 5 掳, 10 掳, 15 掳and 20 掳, 25 掳, respectively) and concave slopes (upper, lower, 10 掳, 15 掳and 20 掳, 25 掳, respectively) are studied by artificial rainfall simulation in laboratory. The effect of downslope slope on soil erosion law is 20 掳, 25 掳and 5 掳, 10 掳, 15 掳, respectively. The results show that in the absence of PAM, runoff sediment concentration decreases with rainfall duration on concave slope or small slope (up slope is 5 掳), while sediment concentration in large slope and convex slope (upper slope 鈮，
本文编号：2439439
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