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| Influence of different drainage conditions on soil erosion and nutrient loss of slope land |
| Wang Hui1,2,Wang Quanjiu2,4,Shao Ming-an2,3 |
| 1.College of Resources and Environment,Northwest A&F University;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Water and Soil Conservation,CAS and MWR: 712100,Yangling,Shaanxi;3.Institute of Geographical Sciences and Natural Resources Research,CAS,100101,Beijing;4.Institute of Water Resource,Xi'an University of Technology,710048,Xi'an: China |
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Abstract To study mass transport from slope land,the process and mechanism of soil erosion and nutrient loss on the slope land under different drainage conditions were investigated by simulating rainfall.Results had indicated that,runoff from the impervious-base soil boxes was generated 5～7min earlier than those from slurry and impervious-base boxes.The total amount of soil erosion from the impervious-base was much more than the sum of those of slurry and impervious-base.Especially,soil erosion of the impervious-base was extremely(intensive) during the second simulating rainfall,and the amount of soil loss was much 5 times than the sum.There was no significant discrepancy for chemical concentration in runoff from the three kinds of base boxes during the initial rainfall.However,during the second rainfall,there was notable discrepancy for chemical concentration in runoff from the different conditions.Therefore,the existing impervious base and low-infiltrate rate ploughed-base slope lands are the potential hazards of soil erosion and phosphorus and potassium loss,(especially) under initial soil water high content.The work may provide some useful information for allocating water and soil conservation management measurements and preventing nutrient loss on the slope land.
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Received: 23 October 2005
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