中文关键词李家河水库暴雨径流溶解性有机质(DOM)紫外-可见(UV-Vis)吸收光谱三维荧光光谱(EEMs) 英文关键词Lijiahe Reservoirstorm runoffdissolved organic matter (DOM)ultraviolet-visible (UV-Vis) spectrumthree dimensional excitation-emission matrix spectroscopy (EEMs)

作者	单位	E-mail
李程遥	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055	xauatlichengyao@163.com
黄廷林	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055	huangtinglin@xauat.edu.cn
温成成	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055
梁伟光	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055
林子深	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055
杨尚业	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055
李凯	西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055 西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055
蔡晓春	李家河水库管理有限公司, 西安 710016

中文摘要 为探究汛期暴雨径流对水库有机质的影响，以李家河水库为例，采用三维荧光光谱-平行因子法（EEMs-PARAFAC）及紫外-可见（UV-Vis）吸收光谱法分析径流过程中4个时期（径流前、径流洪峰期、径流1周后和6周后）溶解性有机质（DOM）含量及组分变化.结果表明：①径流洪峰期水库水体浊度、DOC含量显著升高（P<0.01），洪峰期后逐步下降；②紫外-可见光谱特征参数显示，径流洪峰期a（254）和a（355）显著升高（P<0.01），而E2/E3和E3/E4显著降低（P<0.01），表明暴雨径流使水库水体DOM的浓度、相对分子质量和腐殖化程度升高；③李家河水库共解析出4种荧光DOM组分，分别为陆源腐殖质组分（C1、C2）、微生物腐殖质组分（C3）和类色氨酸组分（C4），径流洪峰期C1~C3组分荧光强度显著升高（P<0.05），表明暴雨径流大幅增加了水库DOM类腐殖质组分含量，洪峰期后C1~C4组分荧光强度不断降低，表明径流后DOM不断沉降和降解.④ Pearson相关性分析显示暴雨径流后水体DOM荧光强度和浊度呈现显著的相关性（r>0.467，P<0.05），表明DOM的减少和悬浮物沉降有关，主成分分析（PCA）表明暴雨径流事件的各个时期水库水质呈现出不同的特征.本研究阐明了暴雨径流对李家河水库DOM含量和组分短期及后续影响，为饮用水水库水质管理提供了科学支撑. 英文摘要 To explore the influence of storm runoff on reservoir organic matter during the flood season, the Lijiahe Reservoir was selected to analyze variations in the content and components of dissolved organic matter (DOM) during four periods (before runoff, flood peak period, 1 week after runoff, and 6 weeks after runoff) using three-dimensional fluorescence spectroscopy parallel factor analysis (EEMs-PARAFAC) and ultraviolet-visible (UV-Vis) spectra. The results showed that:① the turbidity and DOC content of the reservoir increased significantly during the flood peak period (P<0.01) and gradually decreased thereafter; ② the UV-Vis spectrum characteristics showed that a(254) and a(355) were significantly increased in the flood peak period (P<0.01) while E2/E3 and E3/E4 were significantly decreased (P<0.01), indicating that the concentration, relative molecular weight, and degree of DOM humification in the reservoir were increased by storm runoff; ③ four DOM components were identified as terrestrial humus (C1 and C2), microbial humus (C3), and a tryptophan-like component (C4). The fluorescence intensity of the C1-C3 components increased significantly during the flood peak period (P<0.05), indicating that the increase in the DOM humic-like component was caused by the storm runoff. At the same time, a decrease in the fluorescence intensity of the C1-C4 components was observed after the flood peak period, indicating that DOM continuously settled and degraded after runoff; and ④ Pearson's correlation analyses showed that DOM fluorescence intensity and turbidity were significantly correlated (r>0.467, P<0.05), indicating that the observed decrease in DOM content was related to the sedimentation of suspended solids. A principal component analysis (PCA) showed that the water quality in the reservoir reflected the observed characteristics during the different runoff periods. Overall, this study reveals the effects of the storm runoff on DOM content and its components over the short and long term, providing scientific support for the management of drinking water quality.

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