Effect of Polyacrylamide Application on Runoff,Erosion,and Soil Nutrient Loss Under Simulated Rainfall  

作　　者：WANG Ai-Ping LI Fa-Hu YANG Sheng-Min 

机构地区：[1]Inner Mongolia Coal Mine Design and Research Institute, No. 55 Xinhua Road, Hohhot 010010 (China) [2]College of Water Conservancy and Civil Engineering, China Agricultural University, No. 17 Qinghua East Avenue, Haidian District, Beijing 100083 (China) [3]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, No. 26 Xinong Road, Yangling 712100 (China) [4]Beijing Vocational College of Agriculture, No. 5 Daotiannanli, Changyang Town, Beijing 102442(China)

出　　处：《Pedosphere》2011年第5期628-638,共11页土壤圈（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.40635027);the Fund of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,China (No.10501-169)

摘　　要：Soil erosion affects soil productivity and environmental quality.A laboratory research experiment under simulated heavy rainfall with tap water was conducted to investigate the effects of anionic polyacrylamide(PAM) application rates(0,0.5,1.0,and 2.0 g m-2) and molecular weights(12 and 18 Mg mol-1) on runoff,soil erosion,and soil nutrient loss at a slope of 5°.The results showed the two lower rates of PAM application decreased runoff while the highest rate increased runoff as compared with the control.Sediment concentration and soil mass loss increased significantly with the increasing PAM application rate.Compared with the control,PAM application decreased K+,NH4+,and NO3-concentrations in sediment and K+ and NH+4 concentrations in runoff,but significantly increased the mass losses of K+,NH4+,and NO-3 over soil surface except for the NH4+ at PAM application rate lower than 1.0 g m-2.PAM application decreased the proportion of K+ loss with runoff to its total mass loss over soil surface from 60.1% to 16.4%.However,it did not affect the NH4+ and NO3-losses with runoff,and more than 86% of them were lost with runoff.A higher PAM molecular weight resulted in less soil erosion and K+ mass loss but had little effect on runoff and NH+4 and NO3-losses.PAM application did not prevent soil erosion and the mass losses of K+ and NO3-under experimental conditions.Soil erosion affects soil productivity and environmental quality.A laboratory research experiment under simulated heavy rainfall with tap water was conducted to investigate the effects of anionic polyacrylamide（PAM） application rates（0,0.5,1.0,and 2.0 g m-2） and molecular weights（12 and 18 Mg mol-1） on runoff,soil erosion,and soil nutrient loss at a slope of 5°.The results showed the two lower rates of PAM application decreased runoff while the highest rate increased runoff as compared with the control.Sediment concentration and soil mass loss increased significantly with the increasing PAM application rate.Compared with the control,PAM application decreased K＋,NH4＋,and NO3-concentrations in sediment and K＋ and NH＋4 concentrations in runoff,but significantly increased the mass losses of K＋,NH4＋,and NO-3 over soil surface except for the NH4＋ at PAM application rate lower than 1.0 g m-2.PAM application decreased the proportion of K＋ loss with runoff to its total mass loss over soil surface from 60.1% to 16.4%.However,it did not affect the NH4＋ and NO3-losses with runoff,and more than 86% of them were lost with runoff.A higher PAM molecular weight resulted in less soil erosion and K＋ mass loss but had little effect on runoff and NH＋4 and NO3-losses.PAM application did not prevent soil erosion and the mass losses of K＋ and NO3-under experimental conditions.

关 键 词：application rate mass loss molecular weight nutrient concentration sediment concentration 

分 类 号：S157.1[农业科学—土壤学] TS727.2[农业科学—农业基础科学]