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中文摘要：
对贵阳地区2008年10月1日至2009年9月30日大气降水样品中的NO3-浓度和δ^15N组成进行了测定．结果表明，这一年大气降水中NOr浓度加权平均值为0．45mg·L^-1，δ^15N组成的变化范围为-8．0‰-28．7‰，年均值为2．3‰，且主要来源于燃煤释放的含氮物质．NO3-浓度呈现冬高夏低的变化趋势，这可能是受降水量等因素的影响．但δ^15N组成的季节变化与NOr浓度有所不同，呈现秋冬季偏正，而春夏季偏负的特征，推测可能是由生物释放氮、大气雷电固氮及NOx本身的大气行为等引起δ^15N组成的季节差异．
英文摘要：
This study analyzed the concentrations of NO3- and values of δ^15N-NO3- in precipitation taken at Guiyang throughout one year from October 1, 2008 to September 30, 2009. The results indicated that the volume - weighted average concentration of NO3- was O. 45 rag·L^-1 , and the value of δ^15 N- NO3- ranges from - 8. 0‰ to 28.7‰ with the annum average of 2. 3‰ This implied that the source of NO3- was mainly from coal combustion. Significantly higher NO3- concentration in winter than summer suggested that NO3- concentration was mainly affected by precipitation. Seasonal variation of nitrogen isotopic composition was a bit different, with positive in autumn and winter and negative in spring and summer. This suggested that δ^15N-NO3- was mainly affected by biologically-released N, atmospheric nitrogen fixation and NOx behavior in the atmosphere.
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