The high concentration of total nitrogen (TN) is the main threat of water quality safety of Danjiangkou Reservoir,so it is very important to identify the change trends of TN in Reservoir,study the transport characteristic of TN of main tributaries and identify the main source of TN.The monitoring data of TN,nitrate and ammonia in Danjiangkou Reservoir in past 10 years show that the concentration of TN in reservoir is stable at about 1.50 mg/L in recent 10 years,and has a slight increase trend.The concentrations of TN in 16 tributaries are generally higher than that of reservoir,and the contribution rate from non-point pollution source is about 60％.The main component of TN is nitrate.The countermeasures of TN control in Thirteen Five-Year Plan Period are also preliminarily put forward.%总氮浓度过高是丹江口水库水质安全保障的主要威胁,辨析丹江口水库总氮的变化趋势,研究主要入库支流总氮的输出浓度特征,识别水库总氮得主要来源十分重要.丹江口水库近10年的总氮及各形态氮浓度监测数据表明,水库总氮浓度基本稳定在1.50 mg/L左右,稍有增加趋势.16条入库河流总氮浓度普遍较高,且流域面源对总氮的贡献率达到了60％左右,总氮的主要成分是硝态氮.为此,初步提出了十三五期间水源区总氮防控的对策措施.
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