| 贵阳地区大气降水中δ15N-NO3-组成及来源分析 |
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| 引用本文： | 肖红伟,肖化云,龙爱民,王燕丽.贵阳地区大气降水中δ15N-NO3-组成及来源分析[J].环境科学学报,2012,32(4):940-945. |
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| 作者姓名： | 肖红伟 肖化云 龙爱民 王燕丽 |
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| 作者单位： | 1. 中国科学院南海海洋研究所热带海洋环境国家重点实验室,广州,510301
2. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳,550002 |
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| 基金项目： | 国家自然科学基金资助项目(No. 40573006,40721002,40373039) |
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| 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δ15N组成进行了测定.结果表明,这一年大气降水中NO3-浓度加权平均值为0.45mg·L-1,δ15N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δ15N组成的季节变化与NO3-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δ15N组成的季节差异.
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| 关 键 词： | 贵阳 降水 硝酸盐 氮同位素 季节变化 |
| 收稿时间： | 6/1/2011 12:00:00 AM |
| 修稿时间： | 2011/7/29 0:00:00 |
Nitrogen isotopic composition and source of nitrate in precipitation at Guiyang |
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| XIAO Hongwei,XIAO Huayun,LONG Aimin and WANG Yanli.Nitrogen isotopic composition and source of nitrate in precipitation at Guiyang[J].Acta Scientiae Circumstantiae,2012,32(4):940-945. |
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| Authors: | XIAO Hongwei XIAO Huayun LONG Aimin and WANG Yanli |
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| Institution: | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 |
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| Abstract: | This study analyzed the concentrations of NO-3 and values of δ15N-NO-3 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 NO-3 was 0.45 mg·L-1, and the value of δ15N-NO-3 ranges from -8.0‰ to 28.7‰ with the annual average of 2.3‰ This implied that the source of NO-3 was mainly from coal combustion. Significantly higher NO-3 concentration in winter than summer suggested that NO-3 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 δ15N-NO-3 was mainly affected by biologically-released N, atmospheric nitrogen fixation and NOx behavior in the atmosphere. |
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| Keywords: | Guiyang precipitation NO3- nitrogen isotope seasonal variation |
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