Spatial Distribution Characteristics Of Total Nitrogen, Total Phosphorus And Organic Matter In Surface Sediments Of Duliujianhe River

Sediment is the sink and source of nutrients in overlying water. The study of the total nitrogen(TN), total phosphorus(TP) and organic matter(OM) in surface sediments is significant to understand their circulation in water-sediment interface. In this study, the distribution characteristics of the TN, TP and OM contents in the surface sediments of Duliujianhe River were investigated. The experimental results showed that the contents of TN, TP and OM of the entire Duliujianhe River were 124.00-1948.44 mg/kg, 481.67-1635.33 mg/kg and 24397.28-91400.00 mg/kg. TN, TP and OM had the same distribution trend along Duliujianhe River, which increased firstly and then decreased then increased. According to the results of correlation analysis, TN, TP and OM had a certain degree of connection with each other: TN and OM might be derived from the same pollution sources, and there was an obvious interaction between TN and TP. Duliujian River was polluted by organic materials and organic nitrogen, and the pollution of upper and middle reaches was more serious than the downstream.