Agricultural non-point source pollution in the Yongding River Basin

Abstract More and more nitrogen and phosphorus chemical fertilizers are applied in the upstream of the Yongding River Basin. With the aid of convertibility between emergy and value, the calculated ESI (Environmental Sustainability Index) of basin agricultural production is 0.1056, indicating that local agriculture is seriously unsustainable. According to the different combining types of nitrate and ammonium salts with soil particles, soil nitrogen losses under the influence of rainfall-runoff are quantitatively evaluated from the perspective of the nitrogen cycle. By virtue of the content of dissolved and particulate phosphorus in soil, the calculation process for soil phosphorus loss is modeled according to the field runoff volume. The total nitrogen and total phosphorus losses from soil are 96 kg hm −2 and 9 kg hm −2 , respectively. The calculation result of nitrogen and phosphorus losses in the basin is certainly reasonable. Finally, the research emphasis of calculation method for reducing basin agricultural non-point source pollution is represented from management level.

[1]  L. R. Ahuja,et al.  Infiltration and soil water movement , 1992 .

[2]  A. Sakoda,et al.  Simplified dynamic model on carbon exchange between atmosphere and terrestrial ecosystems , 1993 .

[3]  Zhang Shen,et al.  Bioavailable Phosphorus Export by Surface Runoff from Agricultural Field Plots in Guanting Watershed,Beijing , 2003 .

[4]  Maria Nicolina Ripa,et al.  Phosphorus export from agricultural land : a simple approach , 2008 .

[5]  Colorado Colorado,et al.  AMERICAN SOCIETY OF CIVIL ENGINEERS , 2010 .

[6]  Jiawen Wang,et al.  Pay Attention to Rural Non-Point Source Pollution, Guarantee the Security of Drinking Water , 2009, 2009 3rd International Conference on Bioinformatics and Biomedical Engineering.

[7]  Cecília M.V.B. Almeida,et al.  Emergetic ternary diagrams: five examples for application in environmental accounting for decision-making , 2007 .

[8]  Cecília M.V.B. Almeida,et al.  Ferramenta para tomada de decisão considerando a interação dos sistemas de produção e o meio ambiente , 2005 .

[9]  C. Drury,et al.  The indicator of risk of water contamination by nitrate-nitrogen , 2007 .

[10]  Tom Addiscott,et al.  Modeling for All Scales: An Introduction to System Simulation , 2001 .

[11]  M. Jalali.  Phosphorus status and sorption characteristics of some calcareous soils of Hamadan, western Iran , 2007 .

[12]  Saied Mostaghimi,et al.  Dynamic agricultural non-point source assessment tool (DANSAT): model development. , 2009 .

[13]  Zhang Fu-suo,et al.  Nitrogen cycling and balance in winter-wheat-summer-maize rotation system in Northern China Plain. , 2009 .

[14]  Cecília M.V.B. Almeida,et al.  A combined tool for environmental scientists and decision makers: ternary diagrams and emergy accounting , 2006 .

[15]  R. Shibasaki,et al.  Modelling a global biogeochemical nitrogen cycle in terrestrial ecosystems , 2000 .

[16]  Feng Xu,et al.  Yongding River Basin water environmental restoration cost , 2012 .

[17]  Ji Hong-jie.  Estimation of Agricultural Non-Point Source Pollution in Chinaand the Alleviating Strategies III. A Review of Policies and Practices for Agricultural Non-Point Source Pollution Control in China , 2004 .

[18]  O. Akinremi,et al.  Evaluation of phosphorus retention equations for Manitoba soils , 2008 .

[19]  D. Makowski,et al.  Agri-environmental indicators to assess cropping and farming systems. A review , 2011, Agronomy for Sustainable Development.

[20]  S. Smith,et al.  Assessing environmental sustainability of agricultural systems by simulation of nitrogen and phosphorus loss in runoff , 1995 .