Nitrogen Pollution Characteristics and Genetic Analysis of FengHe River and its Tributaries

In December 2011,April 2012 and September 2012, the surface water of the Fenghe River and its tributaries were collected.The temporal variation characteristics of concentration of nitrate nitrogen (NO3-- N), ammonium nitrogen (NH4+- N), and total nitrogen (TN) in the water were studied. Combined with basin characteristics such as land use and precipitation, causes were analyzed. The results showed that NO3-- N content in water gradually increased along the direction of flow spatially, which was closely related to the spatial distribution of land use and pollution sources distribution. In dry period and flood period, the NO3-- N content in water was less than that in usual discharge period. NO3-- N content t in April,2012 reflected the nitrate nitrogen pollution characteristics in storm period. Fenghe River and its tributaries, from source to import into the Weihe River, the concentration of ammonium salt little changed, and at the most sample sites the ammonium salt concentration were not more than 1 mg/L. NO3-- N is drainage nitrogen main stable form in Fenghe River. TN content in Fenghe River system was obviously higher than that of the vclass of the surface water environment quality standard.