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Soil Erosion as Affected by Polyacrylamide Application Under Simulated Furrow Irrigation with Saline Water

查看全文 作　　者：DOU Chao-[1]Yin;LI Fa-[1,2]Hu;[3]L.S.WU 高影响力作者 机构地区：[1]College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083(China);[2]State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Yangling 712100(China);[3]Department of Environmental Sciences,University of California,Riverside 92521(USA)高影响力机构 出　　处：《Pedosphere》索引2012年第22卷第5期,共8页高影响力期刊 基　　金：the National Natural Science Foundation of China (No.40635027);the State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau of China (No.10501-169) 摘　　要：The reduction of soil and water losses under furrow irrigation with saline water is important to environmental protection and agricultural production. The objective of this study was to determine the effect of polyacrylamide (PAM) application on soil infiltration and erosion under simulated furrow irrigation with saline water. Polyacrylamide was applied by dissolving it in irrigation water at the rates of 1.5, 7.5, and 15.0 mg L-1 or spreading it as a powder on soil surface at the rates of 0.3, 1.5, 3.0, and 6.0 g m-2, respectively. The electrolyte concentration of tested irrigation water was 10 and 30 mmolc L-1 and its sodium adsorption ratio (SAR) was 0.5, 10.0, and 20.0 (mmolc L-1)0.5. Distilled water was used as a control for irrigation water quality. Results indicated that the electrolyte concentration and SAR generally did not significantly affect soil and water losses after PAM application. Infiltration rate and total infiltration volume decreased with the increase of PAM application rate. Polyacrylamide application in both methods significantly reduced soil erosion, but PAM application rate did not significantly affect it. The solution PAM application was more effective in controlling soil erosion than the powdered PAM application, but the former exerted a greater adverse influence on soil infiltration than the latter. Under the same total amounts, the powdered PAM application resulted in a 38.2%-139.6% greater infiltration volume but a soil mass loss of 1.3-3.4 times greater than the solution PAM application. 关 键 词：聚丙烯酰胺 土壤侵蚀 咸水 沟灌 模拟 应用程序 电解质浓度 灌溉水质量
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