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| Effect of Antecedent Soil Moisture on Runoff and Sediment and Nitrogen and Phosphorus Losses from Slope Cropland |
| Received:April 24, 2014 |
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| KeyWord:antecedent soil moisture;soil infiltration;runoff process;nutrient concentrations;loss strength |
| Author Name | Affiliation | E-mail | | WANG Li | State Key Laboratory of Soil Erosion and Dryland Farming of Loess Plateau Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation Chinese Academy of Science & Ministry of Water Resources, Yangling 712100, China | | | WANG Li | State Key Laboratory of Soil Erosion and Dryland Farming of Loess Plateau Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation Chinese Academy of Science & Ministry of Water Resources, Yangling 712100, China | wangli5208@nwsuaf.edu.cn | | WANG Quan-jiu | Institute of Soil and Water Conservation Chinese Academy of Science & Ministry of Water Resources, Yangling 712100, China | |
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| Abstract: |
| Antecedent soil moisture is one of the important factors affecting soil infiltration, runoff and solute migration. In this research, soil erosion and nutrient losses of slope cropland were studied under five different antecedent soil moisture levers of 5%, 9%, 13%, 17% and 20% with artificial rainfall method in Dark Loessial soils in gully region of the Loess Plateau. Under the same rainfall intensity and slope, the time for slope soil to reach stable infiltration and to yield stable runoff decreased with the increasing antecedent soil moisture. The amounts of runoff and sediment increased with increasing antecedent soil moisture between 5% and 17%, but reduced between 17% and 20%. There was a significant linear relationship between the amounts of sediment and runoff, with coefficient of 0.889. Concentrations and total losses of soluble phosphorus, nitrate and ammonium were the greatest at 17% of the antecedent soil moisture. Antecedent soil moisture reduced the soil depth of phosphorus and nitrogen accumulation in moist layer. There is little amount of nutrient loss at antecedent soil moisture between 5% and 9%. These results indicate that 17% of antecedent soil moisture would be a critical value for nutrient runoff losses. |
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