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| Effect of Polyacrylamide Hydrolysis on Sandy Loam Infiltration Under Different Wetting Rates |
| Received:January 15, 2015 |
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| KeyWord:wetting rate;polyacrylamide;hydrolysis process;infiltration |
| Author Name | Affiliation | E-mail | | HAN Dong | Institute of Water Conservancy and Civil and Architectural Engineering, Inner Mongolia Agriculture University, Hohhot 010018, China | | | WEI Zhan-min | Institute of Water Conservancy and Civil and Architectural Engineering, Inner Mongolia Agriculture University, Hohhot 010018, China | wei_zhanmin@aliyun.com | | YU Jian | Water Resources Research Institute of Inner Mongolia, Hohhot 010020, China | | | SONG Ri-quan | Water Resources Research Institute of Inner Mongolia, Hohhot 010020, China | |
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| Abstract: |
| In order to reveal the influence of polyacrylamide(PAM) on soil infiltration under different wetting rates, 3 PAM amounts(0 kg·hm-2, 22.5 kg·hm-2 and 45 kg·hm-2) and 2 water inflow rates(2.5 mm·min-1 and 6.25 mm·min-1) were used in soil box to study the variation of soil infiltration parameters and to characterize soil structures by measuring capillary porosity, gas conductivity and aggregate content. Cumulative infiltration amount and stable infiltration rate were significantly influenced by wetting rates,and they were respectively 23.75% and 26.70% lower under high wetting rate than under low wetting rate. Under the same wetting rate, PAM had two quite different effects on soil infiltration over wetting course. At wetting phase, PAM was hydrolyzing and its long-chain molecules clogged soil pores and thus inhibited soil water movement, resulting in decreases in the cumulative soil infiltration, soil non-capillary porosity and conductivity gas rate, with more reduction at higher PAM rate. At continuous flow phase, PAM was completely hydrolyzed and it thus increased soil structure stability and water-stable aggregates, thereby improving soil infiltration rate, soil non-capillary porosity and conductivity gas rate in a dose-effect manner. These results would provide theoretical evidence for PAM application to improvement of soil structure. |
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