中文关键词硝酸盐汾河下游同位素氮污染氮素分馏 英文关键词nitratedownstream of Fenhe Riverisotopenitrogen pollutionnitrogen fractionation

作者	单位	E-mail
汪银龙	西安理工大学省部共建西北旱区生态水利国家重点实验室, 西安 710048	1093620282@qq.com
冯民权	西安理工大学省部共建西北旱区生态水利国家重点实验室, 西安 710048	mqfeng@xaut.edu.cn
董向前	山西水利职业技术学院水利工程系, 运城 044000

中文摘要 通过应用多同位素示踪、IsoSource模型计算及微生物检测等方法，对汾河下游硝酸盐污染来源进行甄别，计算得出各来源贡献率.结果表明，汾河下游河流含氮物质的主要存在形式为NO₃^--N和NH₄⁺-N，77.8%的样品中NO₃^--N含量超过国家饮用水标准.稷山、河津和入黄口反硝化微生物丰度较高，很多优势菌属参与反硝化作，造成了氮素的分馏.同位素中δ¹⁵N-NO₃^-和δ¹⁸O-NO₃^-含量变化范围分别为5.30‰~12.90‰和1.3‰~1.8‰，粪便和污水是临汾段河流硝酸盐主要来源，约占总硝酸盐来源的68%；在襄汾段，河流中硝酸盐主要来源为粪便和污水以及农业化肥，其贡献比例分别为37.5%和37%；农业化肥是河津段河流硝酸盐的主要来源，其贡献比例为49.3%. 英文摘要 Through the application of multi-isotope tracing, IsoSource model calculation, and microbial detection, the source of nitrate pollution in the lower reaches of the Fenhe River was screened, and the contribution rate of each source was calculated. The results showed that the main forms of nitrogen-containing substances in the lower reaches of the Fenhe River are NO₃^--N and NH₄⁺-N and that the NO₃^--N content in 77.8% of the samples exceed the national drinking water standard. The abundance of denitrifying microorganisms in Jishan, Hejin, and the Fenhe River into the Yellow River is high, and many dominant bacteria participate in denitrification, resulting in nitrogen fractionation. The contents of δ¹⁵N-NO₃^- and δ¹⁸O-NO₃^- in the isotopes ranged from 5.30‰ to 12.90‰ and from 1.3‰ to 1.8‰, respectively. Manure and sewage were the main sources of nitrate in the Linfen section, accounting for 68% of the total nitrate source. In the Xiangfen section, the main sources of nitrate in the river were manure and sewage, at 37.5%, and agricultural fertilizer, at 37%. Agrochemicals are the main sources of nitrate in the Hejin section of the river, with a contribution ratio of 49.3%.

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