赣江水体无机氮分布特征  

The Distributive Characters of Inorganic Nitrogen in Ganjiang River

作　　者：陈多多[1] 吴敦银[1] 王鹏[1] 李微[1] 

机构地区：[1]江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,江西南昌330022

出　　处：《安徽农业科学》2014年第11期3348-3351,共4页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金项目(41201033);鄱阳湖湿地与流域研究教育部重点实验室(江西师范大学)开放基金资助(PK2012007)

摘　　要：于2013年1月(枯水期)、6月(丰水期)对赣江干流及主要支流的24个采样点进行水样采集,分析研究了赣江水体NO3--N、NH4+-N以及NO2--N的时空分布特征。结果表明,赣江水体无机氮的主要形式为NO3--N,约占78%,其次为NH4+-N,NO2--N含量很小,平均浓度低于0.02 mg/L。赣江枯水期NO3--N平均含量为1.86 mg/L,略高于丰水期的1.74 mg/L;枯水期NH4+-N含量为0.59mg/L,高于丰水期的0.45 mg/L。枯水期赣江流域上游到下游NO3--N和DIN含量呈现先下降后逐渐上升的趋势,NH4+-N含量在赣州附近出现最大值,其次在南昌下游赣江南支,其他地区含量较小,反映了城市污水排放对NH4+-N的影响。丰水期上游至下游NO3--N含量呈逐渐下降趋势,但降幅不大,NH4+-N含量变化趋势与枯水期相似。主要支流中枯、丰水期以S06样点(桃江)的DIN含量和NO3--N含量最高,主要原因为桃江流域农业化肥的氮输入;其次为S18样点(袁水),可能与新余市大量排放工业废水有关。We sampled river water regularly in 24 sampling points dispersed in the mainstream and major tributaries in June 2013 （flood season）and January of 2013 （dry season）,the spatial and temporal distribution characteristics of nitrogen in the Ganjiang River were studied.The results indicated that nitrate N （NO3--N） was the main composition of inorganic N,which is 78％,followed by NH4 ＋-N,and NO2--N concentration is very few,that average concentration is less than 0.02 mg/L.The average of NO3--N is 1.86mg/L in dry season in the Ganjiang River,higher than that of flood season,which is 1.74 mg/L; the average of NH4 ＋-N is 0.59 mg/L in dry season,higher than that of flood season,which is 0.45 mg/L.The concentrations of NO3--N and DIN showed a increasing trend after the first decline from upstream to downstream in the Ganjiang River during dry season,while NH4 ＋-N has maximum value near downstream of Ganzhou and Nanchang,which are much higher than other samples.That reflects the influence of the urban wastewater discharge on NH4 ＋-N.The concentrations of NO3--N showed slight decreasing trend from upstream to downstream in Ganjiang River during flood season,The concentrations of NH4 ＋-N showed the similar tend to the dry season.In tributaries,sample at S16 （Taojiang River）has high value in DIN and NO3--N concentration in both dry season and flood season,due to nitrogen input of agricultural fertilizer in surrounding areas; sample at S18 （Yuanshui River） followed,probably because of industrial wastewater discharge of Xinyu.

关 键 词：无机氮 赣江流域 时空分布 氨态氮 硝态氮 

分 类 号：S273.5[农业科学—农业水土工程]