赣江流域水体无机氮分布特征

于2006年1月和7月对赣江流域地表水进行了系统采集,分析研究了水体中各形态无机氮分布特征,结果表明,赣江水体中主要的氮素形式是NO-3-N,枯水期赣江流域NO-3-N、DIN从上游至下游呈明显的上升趋势,NH 4-N变化不明显.丰水期从上游至下游NO-3-N含量逐渐降低,但降幅不大,而NH 4-N和DIN在中游含量最低,下游最高.主要支流中枯水期以袁水NO-3-N和DIN含量最高,赣江中支NH 4-N含量为全流域最大值,而丰水期以禾水NO-3-N为流域最高值.赣江主干流丰水期各形态无机氮含量明显低于枯水期.氮污染较重的袁水的输入致使G38(樟树)处氮含量明显高于其它地方.

The Distributive Character of Inorganic Nitrogen in the Ganjiang River Catchments

Various forms of inorganic nitrogen(N) of surface water were investigated in the Ganjiang River catchments during January(dry season) and July(flood season),2006.The results indicated that nitrate N(NO-3-N) was the main existence form of inorganic N among the Ganjiang River catchments.The concentrations of NO-3-N and DIN showed increasing trend from upstream to downstream in the Ganjiang River catchments during dry season,but NH+4-N showed no significant variation trend.The concentrations of NO-3-N showed slight decreasing trend from upstream to downstream in the Ganjiang River catchments during flood season,but the concentrations of NH+4-N and DIN were the lowest in the middle stream and the highest in the downstream.The concentrations of NO-3-N and DIN in the Yuanshui River were the highest than the other major tributaries during dry season,and the concentrations of NH+4-N were the highest in the Ganjiang middle tributaries.But the NO-3-N concentrations were the highest in the Heshui River.The concentrations of various forms of inorganic N were apparently lower in the flood season than in the dry season.The N concentrations were apparently higher at the G38 than other sites due to the recharge from the Yuanshui River that was polluted by nitrogen seriously.