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中文摘要：
为了分析鄱阳湖水体无机氮的时空分布，于2006年1月和7月对鄱阳湖湖面及其主要支流下游的表层水进行系统采样，分析研究了各种形态无机氮的分布变化特征。结果表明，枯水期鄱阳湖无机氮在上游主航道较低，低于全湖平均值，航道中段无机氮含量明显高于其它区；丰水期氮含量高值区出现在主航道中段．在下游处无机氮含量又呈现上升的趋势；鄱阳湖NH4^＋-N和DIN在枯、丰水期有相似的变化规律；鄱阳湖主航道枯水期NO3^-N、NH4^＋-N、DIN浓度明显高于丰水期，而NO2^- -N恰好相反，其主要支流丰水期NH4^＋ -N和DIN含量也比枯水期低。
英文摘要：
Various forms of inorganic N were investigated in the Poyang Lake and at the mouths of its major tributaries in January and July, 2006. The results showed that the concentrations of inorganic N in the upstream of the Poyang Lake were lower than the average level of the whole lake during dry season, and the highest concentrations were found in the middle reach of the lake ; during flood season, the highest concentration peaks were found in the middle stream too, and the concentrations of inorganic N again increased in the flow direction. In the lake, the variations of NH4^- - N and DIN in dry season and in flood season were similar. In the main channel, the concentrations of NO3^- - N,NH4^＋ - N and DIN during dry season were higher than those during flood season, hut the concentration of NO2^- - N was to the contrary. The concentrations of NH4^＋ - N and DIN during dry season were also higher than those during flood season in the major tributaries.
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