【摘要】：通過(guò)室內(nèi)人工模擬降雨試驗(yàn),研究了聚丙烯酰胺(polyacrylamide,PAM)施用量(0、0.5、1.0和2.0 g/m2)對(duì)凸型坡(上、下坡坡度分別為5°、10°、15°和20°、25°)和凹型坡(上、下坡坡度分別為20°、25°和5°、10°、15°)土壤侵蝕規(guī)律的影響。結(jié)果顯示,無(wú)PAM應(yīng)用時(shí),凹型坡或小坡度凸型坡(上坡坡度為5°)徑流含沙量隨降雨歷時(shí)逐漸減小,而大坡度凸型坡(上坡坡度≥10°)徑流含沙量在降雨過(guò)程中會(huì)急劇增大。凸型坡平均土壤流失量是凹型坡的8.4倍。PAM應(yīng)用顯著增大了凹型坡和小坡度凸型坡徑流含沙量和土壤流失量(P0.05),但減小了大坡度凸型坡土壤流失量。PAM應(yīng)用后,土壤流失量與坡度大小無(wú)明顯關(guān)系,此時(shí)凸型坡平均土壤流失量為凹型坡的1.2倍。在生產(chǎn)實(shí)踐中PAM可用于控制較陡(≥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 擄, 10 擄, 15 擄and 20 擄, 25 擄, respectively) and concave slopes (upper, lower, 10 擄, 15 擄and 20 擄, 25 擄, respectively) are studied by artificial rainfall simulation in laboratory. The effect of downslope slope on soil erosion law is 20 擄, 25 擄and 5 擄, 10 擄, 15 擄, 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 擄), while sediment concentration in large slope and convex slope (upper slope 鈮，

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