| 北京城区大气氮湿沉降特征研究 |
| 摘要点击 2391 全文点击 1309 投稿时间：2013-06-20 修订日期：2013-09-10 |
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| 中文关键词 北京城区 大气氮湿沉降 离子交换树脂法 |
| 英文关键词 Beijing urban area atmospheric nitrogen wet deposition ion exchange resin method |
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| 中文摘要 |
| 采用离子交换树脂法研究2012年6~10月北京五环内城区大气中不同形态氮在不同月份环路（五环、四环、三环和二环）以及功能区（文教区、环路、生活区、火车站和公园）的湿沉降差异，探索城市区域内不同形态氮在时间、空间和功能区上沉降的特征. 结果表明氨氮、硝态氮和亚硝态氮的沉降均体现出明显的时间特征. 其中，在研究时段内，氨氮和硝态氮沉降均呈现出先升高后降低的趋势，7月达到最大值；亚硝态氮沉降呈现出先降低后上升的趋势，9月达到最大值. 大气氨氮和硝态氮沉降量受到降雨量的影响显著（P<0.05）. 在空间沉降特性方面，氨氮、硝态氮和亚硝态氮在不同环路上沉降没有显著的差别，环路和火车站等功能区氮沉降高于其它功能区. |
| 英文摘要 |
| With the ion-exchange resin method, the atmospheric nitrogen wet deposition in Beijing urban area within the Fifth Ring Road was investigated from June to October, 2012. The relationship between atmospheric nitrogen wet deposition and rainfall precipitation was investigated, the differences of nitrogen wet deposition in different months, different ring roads (the Fifth Ring Road, the Fourth Ring Road, the Third Ring Road and the Second Ring Road) and different functional areas (institutes and colleges district, ring-road, residential areas, railway station and public garden) were also investigated. The results showed that the average value and standard deviation of ammonia-nitrogen, nitrate-nitrogen and nitrite-nitrogen were significantly different during different months in 2012. The atmospheric nitrite nitrogen deposition first decreased and then increased, the maximum value appeared in September. The positive relationships between ammonia nitrogen (nitrate nitrogen) and mean monthly precipitation and negative relationships between nitrite nitrogen and mean monthly precipitation were both significant (P<0.05). The three nitrogen depositions of ring-road and railway station were higher than other functional areas, but only the nitrite nitrogen deposition had obvious regional difference. The differences of the three nitrogen depositions among different ring roads were all not significant and it meant that the nitrogen wet deposition was equally distributed in Beijing urban area. |
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