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| Effect of macromolecule polymers on soil physical characteristics and runoff and sediment generation on slopeland |
| Feng Hao,Wu Shufang,Wu Pute |
| Northwest Sci-Tech University of Agriculture and Forest,Institute of Soil and Water Conservation,Chinese Academy of Sciences,Ministry of Water Resources,National Engineering Research Center for Water Saving Irrigation at Yangling,712100,Yangling,Shaanxi,China |
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Abstract Through the simulated rainfall experiment and indoor experiment for the purpose of studying macromolecule polymers on soil improvement and controlling soil erosion,three types of macromolecule polymers with different concentrations including polypropylene acid,polythene hydrin and urea-formaldehyde resin on changing soil property and controlling soil and water loss are focused.The results showed that,all three types of macromolecule polymers have significant effect of improving soil physical properties.Compared with the control,the content of water-stable aggregate and the soil permeability increased by 17.27% and 41.81% respectively,and the soil bulk density decreased by 11.18% and the ability of holding water increased by 2.8 times.Runoff and soil erosion amount on the slope land applied macromolecule polymers decreasedby 42.05% and 58%,respectively,in comparison to the control because it can put off runoff generation and（decrease） velocity of it.Based on the comprehensive effects on improving soil structure, increasing soil infiltration and controlling runoff and sediment,the best application concentration range of three types of macromolecule polymers should be polypropylene-acid 116～145?mL/m2,polythene-hydri 36～40?g/m2 and ureaformaldehyde resin 180.0～240.0?mL/m2,respectively,and the polypropylene acid has the best effect.These three macromolecule polymers has the wide application foreground for soil and water conservation in the future,whose duration of their effects and the optimal application concentration need to be researched further,however.
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Received: 11 May 2005
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