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This paper revealed the spatial and temporal distribution and source characteristics of dissolved organic nitrogen (DON) in the watershed through the joint analysis of water quality indicators, three-dimensional fluorescence spectroscopy (3DEEM) and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The results showed that the proportion of DON concentration to total dissolved nitrogen concentration in all counties of the watershed in all seasons ranged from 15% to 20%. The overall DON level was low, while the DON/TN ratios in the main stream sections of the two downstream counties were significantly higher than those in the upstream. 3DEEM showed that DOM was dominated by humus of terrestrial origin, and the activity of the protein-like fractions was enhanced in summer and autumn. The fluorescence index indicated that agricultural input dominated the exogenous pollution. FT-ICR MS detected that nitrogenous organic matter was dominated by lignin-like substances. The input of Yellow Water (YH) elevated the percentage of condensed aromatics downstream by 11.4%. The lower amount of nitrogenous organic matter in the water body in summer compared with autumn at Gaojiaxie Village (G9) revealed the influence of land-source humus input. The transformation of dissolved organic nitrogen in the Fen River basin was synergistically driven by exogenous inputs, biodegradation and photolysis, which formed the characteristics of DON sources under the action of multiple mechanisms. The study suggested that priority should be given to the control of tributary inputs of difficult-to-degrade organics to enhance the effectiveness of management.

, authors=Hui SUN^{1, 2}, Feng ZHANG^{1, 3, *}, Xiao-yu YANG¹, Yan WANG¹, Chao-xu WANG^{1, 3}, Hong-yan LI¹, Xiao-bo CUI², Li-bo MAO⁴, authorsList=Hui SUN, Feng ZHANG, Xiao-yu YANG, Yan WANG, Chao-xu WANG, Hong-yan LI, Xiao-bo CUI, Li-bo MAO, authorCompany=null, correspAuthors=Feng ZHANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314918466860179808, articleId=1314918465484448094, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=水体中含氮有机物的分布特征及来源解析——以汾河水库上游流域为例, columnId=1234106388268503686, journalTitle=中国环境科学, columnName=环境生态, runingTitle=null, highlight=null, articleAbstract=

通过水质指标、三维荧光光谱（3DEEM）与傅里叶变换离子回旋共振质谱（FT-ICR MS）联合分析，揭示了流域内溶解性有机氮（DON）的时空分布及来源特征．结果表明：流域各县四季DON浓度占总溶解态氮浓度的比例在15%~20%之间，整体DON水平较低，而下游两县干流断面的DON/TN比值明显高于上游．3DEEM显示溶解性有机物（DOM）以陆源腐殖质为主，夏秋季类蛋白组分活性增强，荧光指数表明农业输入主导外源污染．FT-ICR MS检测到含氮有机物以木质素类为主，引黄水（YH）输入使下游稠合芳香物占比提升 11.4%，高家舍村（G9）相比秋季，夏季水体含氮有机物数量较低，揭示了陆源腐殖质输入的影响．汾河流域溶解性有机氮的转化受外源输入、生物降解与光解协同驱动，形成多机制作用下的DON来源特征，研究建议优先管控支流难降解有机物输入以提升治理效能．

, authors=孙晖^{1, 2}, 张峰^{1, 3, *}, 杨晓宇¹, 王岩¹, 王朝旭^{1, 3}, 李红艳¹, 崔晓波², 毛立波⁴, authorsList=孙晖, 张峰, 杨晓宇, 王岩, 王朝旭, 李红艳, 崔晓波, 毛立波, authorCompany=null, correspAuthors=张峰, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=/sX8RQj3FAuwOZoyxv/1Fg==, magXml=xRl8Pg7SnqV1f/lvnfglAw==, pdfUrl=null, pdf=2/r/WlzPu66KF+9d+4NmJA==, pdfFileSize=3995398, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=fwSISauTxKxEHWlIXfS72A==, mapNumber=null, fund=null)}, authors=[Author(id=1314918467673874798, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918465484448094, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=997613678@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314918467900367217, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918465484448094, authorId=1314918467673874798, language=EN, stringName=Hui SUN, firstName=Hui, middleName=null, lastName=SUN, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=^{1, 2}, address=^1.College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong 030600, China
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孙晖（1993-），男，山西太原人，太原理工大学硕士研究生，主要从事饮用水风险监测．发表论文3篇．997613678@qq.com.

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孙晖（1993-），男，山西太原人，太原理工大学硕士研究生，主要从事饮用水风险监测．发表论文3篇．997613678@qq.com.

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