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Effects of Near-Surface Hydraulic Gradients on Nitrate and Phosphorus Losses in Surface Runoff

Fen-Li Zhenga,*, Chi-Hua Huangb and L. Darrell Nortonb

a State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, CAS and MWR, Northwestern Sci-Tech University of Agriculture and Forestry, 26 Xinong Road, Yangling, Shaanxi, 712100 China
b USDA-ARS National Soil Erosion Research Laboratory, 275 South Russell Street, Purdue University, West Lafayette, IN 47907-2077



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  		Fig. 1. Hillslope position and hydrologic condition.

 


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  		Fig. 2. Experimental setup.

 


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  		Fig. 3. The NO3–N concentration in runoff during a 90-min run under different hydraulic gradients. Error bars indicate standard derivation.

 


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  		Fig. 4. The PO4–P concentration in runoff during a 90-min run under different hydraulic gradients. Error bars indicate standard derivation.

 




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