| 利用δ15N-NO3-和δ18O-NO3-示踪北京城区河流硝酸盐来源 |
| 摘要点击 4622 全文点击 1639 投稿时间：2015-11-02 修订日期：2015-12-27 |
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| 中文关键词 同位素示踪 δ15 N-NO3- δ18O-NO3- 硝酸盐污染 稳定同位素混合模型 贡献率 |
| 英文关键词 isotope tracing δ15 N-NO3- δ18O-NO3- nitrate pollution stable isotope mixing model contribution rate |
| 作者 | 单位 | E-mail | | 赵庆良 | 河南大学环境与规划学院, 开封 475004 | zql_01@163.com | | 马慧雅 | 河南大学环境与规划学院, 开封 475004
中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 任玉芬 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | yfren@rcees.ac.cn | | 王效科 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 彭剑锋 | 河南大学环境与规划学院, 开封 475004 | | | 贺成武 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 武俊良 | 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | | | 刘梦贞 | 河南大学环境与规划学院, 开封 475004 | | | 闫苗苗 | 首都师范大学资源环境与旅游学院, 北京 100048 | |
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| 中文摘要 |
| 为定量化识别北京城区河流硝酸盐来源,采用δ15 N-NO3-和δ18O-NO3-双同位素示踪法对北京城区河流河水硝酸盐的氮氧稳定同位素组成进行分析,利用稳定同位素混合模型追溯北京城区河流硝酸盐来源,并评估各污染源的贡献率.结果表明:1北京河流无机氮污染以硝酸盐氮(NO3--N)污染为主,且河流下游硝酸盐氮污染较为严重.2北京城区地表河流δ15 N-NO3-值范围为6.26‰~24.94‰,δ18O-NO3-值范围为-0.41‰~11.74‰; 下游δ15 N-NO3-值比上游大.3根据稳定同位素混合模型,北京河流中硝酸盐贡献率平均值分别为:粪肥及生活污水61.2%、土壤有机氮31.5%、大气沉降7.3%. |
| 英文摘要 |
| In order to quantitatively identify sources of nitrate pollution in Beijing urban area and provide effective guidance for relevant departments to control the pollution of Beijing rivers, δ15 N-NO3- and δ18O-NO3- isotope tracing method was used to analyze the composition of nitrogen and oxygen stable isotopes from nitrate in Beijing urban river. Besides, stable isotope mixing model was adopted to track nitrogen sources of nitrate in Beijing urban rivers and the contribution rates of respective pollution sources were evaluated. The results showed that:1 NO3--N pollution was the main inorganic nitrogen pollution in Beijing rivers and pollution of downstream was more serious than that of upstream. 2δ15 N-NO3- in Beijing urban surface rivers was in range of 6.26‰-24.94‰, while δ18O-NO3- ranged -0.41‰-11.74‰; δ15 N-NO3- increased from upstream to downstream along the flow of the surface water. 3The nitrate pollution composition of Beijing rivers could be gained from the stable isotope mixing model. The average contribution rates of manure and sewage, soil nitrate and atmospheric deposition were 61.2%, 31.5% and 7.3%, respectively. |
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