• 关键词：溶解性有机物(DOM)  三维荧光光谱  平行因子法(PARAFAC)  水质  圆明园

• 基金项目：新疆维吾尔自治区重点实验室开放课题（No.2017D04024）；国家自然科学基金（No.51778618，52070192）；中国人民大学科学研究基金（中央高校基本科研业务费专项资金资助）项目成果（No.RUCJJ2019014）

• 蒋丹阳
• 中国人民大学环境学院, 北京 100872

• 彭玮瑄
• 中国人民大学环境学院, 北京 100872

• 廖思颖
• 中国人民大学环境学院, 北京 100872

• 郑祥
• 1. 中国人民大学环境学院, 北京 100872;2. 北京市可持续城市排水系统构建与风险控制工程技术研究中心, 北京 100044

• 陈惠鑫
• 中国人民大学环境学院, 北京 100872

• 程荣
• 中国人民大学环境学院, 北京 100872

• 于亚男
• 北京市海淀区圆明园管理处, 北京 100084

• 摘要：天然水体中的溶解性有机物（Dissolved Organic Matter，DOM）具有多样的生态意义，已被用作评价天然水体水质状况的一项重要指标.本研究运用三维荧光光谱（Excitation-Emission Matrix Spectroscopy，EEMs）测量了圆明园水体中溶解性有机物的四季变化情况，利用平行因子法进行组分解析，分离得到类腐殖酸（C1）、类酪氨酸（C2）、类色氨酸（C3）3种DOM组分，且3种组分具有一定同源性.类腐殖酸组分含量在季节间的变化较大，夏季明显高于其他季节，另外两种组分的含量在四季间的变化不大.计算FI、HIX、BIX、β：α 4项特征参数，结果表明，所有样本在4个季节的内源性特征明显，受人为排放等陆源输入影响较小，水体DOM腐殖化程度较低，新鲜DOM占比大.对3种DOM组分、荧光特征参数与水质指标进行斯皮尔曼相关性分析，发现类酪氨酸与类色氨酸可能是TOC的重要组成部分.类腐殖质组分与4种荧光特征参数均显著相关，并与水体中氮（p<0.01）、磷（p<0.05）的循环与迁移有关，具有重要的生态意义.水体中的N/P比与DOM存在显著的负相关关系（p<0.05），可通过控制N/P比来抑制水体中浮游植物的生长，减少内源DOM的产生与释放，从而达到降低水体DOM的目的.

• Abstract：Dissolved Organic Matter (DOM) in natural water bodies has diverse ecological significance, and it has been used as an important indicator to evaluate the water quality of natural water bodies. In this study, the distribution and characteristics of DOM in the water body of Yuanmingyuan were investigated using Excitation-Emission Matrix Spectroscopy (EEMs) and parallel factor analysis (PARAFAC). And three components of DOM were separated, including one humic-like substance (C1), one tyrosine-like substance (C2), and one tryptophan-like substance (C3), which share the same source to certain extent. The concentration of humic-like substance varies with different seasons, with the highest concentration in summer, while other two substances stay stable over the year. The results of fluorescence characteristic indices (FI, HIX, BIX and β:α) show significant autochthonous production, small continental input, low humification degree, and large share of newly generated DOM in all samples during four seasons. Spearman correlation analysis reveals that the tyrosine-like substance and tryptophan-like substance may be the main components of TOC in Yuanmingyuan. The humic-like substance significantly correlates with four fluorescence characteristic indices, the migration and transformation of nitrogen (p<0.01), and phosphorus (p<0.05), indicating an important role of the humic-like substance in the water system. N/P ratio negatively correlates with the concentration of DOM in Yuanmingyuan, which suggests that controlling the N/P ratio can inhibit biological activity and then reduce the autochthonous DOM in Yuanmingyuan.

• Key words：dissolved organic matter (DOM)  three-dimensional fluorescence  parallel factor (PARAFAC) analysis  water quality  Yuanmingyuan

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