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利用delta~(15)N-NO_3~-和 delta~(18)O-NO_3~-示踪北京城区河流硝酸盐来源
Alternative Titledelta~(15)N-NO_3~- and delta~(18)O-NO_3~- Tracing of Nitrate Sources in Beijing Urban Rivers
赵庆良; 马慧雅; 任玉芬; 王效科; 彭剑锋; 贺成武; 武俊良; 刘梦贞; 闫苗苗
Source Publication环境科学
Abstract为定量化识别北京城区河流硝酸盐来源,采用delta~(15)N-NO_3~-和delta~(18)O-NO_3~-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(NO_3~--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delta~(15)N-NO_3~-值范围为6.26~24.94,delta~(18)O-NO_3~-值范围为-0.41~11.74; 下游delta~(15)N-NO_3~-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%.
Other AbstractIn 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, delta~(15)N-NO_3~- and delta~(18)O-NO_3~- 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 NO_3~--N pollution was the main inorganic nitrogen pollution in Beijing rivers and pollution of downstream was more serious than that of upstream. ②delta~(15)N-NO_3~- in Beijing urban surface rivers was in range of 6.26-24.94, while delta~(18)O-NO_3~- ranged -0.41-11.74; delta~(15)N-NO_3~- 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.
Keyword同位素示踪 硝酸盐污染 稳定同位素混合模型 贡献率
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GB/T 7714
赵庆良,马慧雅,任玉芬,等. 利用delta~(15)N-NO_3~-和 delta~(18)O-NO_3~-示踪北京城区河流硝酸盐来源[J]. 环境科学,2016,37(5):1692-1698.
APA 赵庆良.,马慧雅.,任玉芬.,王效科.,彭剑锋.,...&闫苗苗.(2016).利用delta~(15)N-NO_3~-和 delta~(18)O-NO_3~-示踪北京城区河流硝酸盐来源.环境科学,37(5),1692-1698.
MLA 赵庆良,et al."利用delta~(15)N-NO_3~-和 delta~(18)O-NO_3~-示踪北京城区河流硝酸盐来源".环境科学 37.5(2016):1692-1698.
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