Agricultural non-point source nitrogen simulation research of Yongding River in Hebei province

Comparing with point source pollution, the non-point source (NPS) one, particularly from agricultural activities, has been dominant in many countries presently, causing nutrient loss, aqueous systems damaging, and eutrophication. One of the key elements responsible for it is nitrogen (N). The Yongding River is an important watershed in North China, which relates to Beijing City (capital of China), Tianjing City and Hebei, Inner Mongolia, Shanxi province. This study, reveals agricultural NPS nitrogen of Yongding River in Hebei province. The resource, loading and distribution of agricultural NPS nitrogen are simulated and analyzed in the paper based on remoting sense and geographic information system. The result indicates that the total NPS-N loading of the research area was 5.68×10⁴ t in 2008. The loading of agricultural landuse was 4.38×10⁴ t, and that of rural life and livestock feeding was 0.90×10⁴ t and 0.40×10⁴ t respectively. As far as the spacial distribution of the loading is concerned, farm lands, villages and hoggeries were areas with heavy pollution. In the conclusion, it is suggested that the methods of agricultural landuse and N fertilizer utilization should be improved as well as the treatment efficiency of waster water and solid waste should be increased.