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| Characteristics of total phosphorus loss into surface runoff from farmland |
| ZHU Hao1, 2, TONG Juxiu1, 2, XIA Chuanan1, 2, LI Jiayun1, 2, HU Xiaonong1, 2, YUAN Yongkun3 |
| 1. Key Laboratory of Groundwater Circulation and Evolution, of Ministry of Education China University of Geosciences, Beijing 100083, China; 2. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China; 3. Qingpu District Water Technology Extension Station of Shanghai City, Shanghai 201799, China |
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Abstract To characterize phosphorus loss in surface runoff from farmland,simulated rainfall experiments were performed in a test field in Qingpu District of Shanghai. And different methods of fertilization were implemented to study the total phosphorus loss at different stages of runoff. The results show that phosphorus loss was more in the early runoff stage than that in the late runoff stage with stable heavy rainfall, and loss rate of the former is almost three times that of the latter. However, it takes a much longer time of the late runoff stage, so the mass of phosphorus loss will be large in the late runoff stage, which is approximately 1.5 times that of the early run off stage. Moreover, the total mass of phosphorus loss has a notable correlation with runoff volume where the correlation coefficient of them is close to 1 by computation, so runoff volume has a great effect on the mass of phosphorus loss. On the other hand, different applications of fertilizer also affect the bulk of phosphorus loss. The soil phosphorus would be easier to lose if the direction of fertilizer application is parallel to the direction of surface runoff flow,compared to the perpendicular flow. And the peak value of total phosphorus concentration in the former condition is almost 2.5 times that in the latter condition. The results will provide a significant reference for the reduction of reduce phosphorus loss and the corresponding non-point source water pollution.
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Received: 19 December 2015
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