Abstract
In order to evaluate the impacts of N and P mobility from agricultural soils on surface water quality, the dissolved N and P concentrations in the runoff, the drainage and stream waters nearby agricultural lands were investigated at the karst hilly regions in central Guizhou Province. The results shown that the concentrations of NO3−, NH4+ and PO43− in the runoff from upland soils were 9.8~22.1 mg L−1, 0.429~0.818 mg L−1 and 0.025~0.052 mg L−1, respectively, and higher concentrations of NO3− (14.5~25.3 mg L−1) in the drainage waters from paddy soils. In karst areas, the concentrations of NO3− in the stream waters nearby agricultural lands was 14.9~28.5 mg L−1, as indicated by high concentration of NO3− compared with the Grade III of Surface Water Quality Standard of China, suggesting a eutrophication problem for surface water nearby agricultural lands with intensive cultivation.
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