巢湖水体溶解性有机质动态分布特征及其与水环境因子的关系  

Dynamic distribution characteristics and its relationship with water environment factors of dissolved organic matter in Lake Chaohu,China

作　　者：柯乔君 余丽 黄显怀 黄木易 李卫华 杨厚云 申慧彦 张樊 陈凡 KE Qiaojun;YU Li;HUANG Xianhuai;HUANG Muyi;LI Weihua;YANG Houyun;SHEN Huiyan;ZHANG Fan;CHEN Fan(School of Environmental and Energy Engineering,Anhui Jianzhu University,Hefei 230601;Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse,Hefei 230601)

机构地区：[1]安徽建筑大学环境与能源工程学院,合肥230601 [2]环境污染控制与废弃物资源化利用安徽省重点实验室,合肥230601

出　　处：《安徽农业大学学报》2024年第6期1022-1031,共10页Journal of Anhui Agricultural University

基　　金：安徽省自然科学基金项目(2108085ME186,2008085QE264);国家自然科学基金青年项目(41601203,52100020,51978003);安徽省高校省级自然科学研究重点项目(KJ2020A0467);安徽建筑大学引进人才及博士启动基金项目(2019QDZ10);安徽建筑大学科研项目储备库培育项目(2023XMK04)共同资助。

摘　　要：为了解典型富营养化湖泊巢湖水体溶解性有机质(DOM)的性质和特征,在2021年3月至2022年1月对巢湖进行周年调查,并运用三维荧光光谱联合平行因子(PARAFAC)分析的方法,探究了巢湖水体中DOM组成、时空分布特征、来源及其与水环境因子的关系。结果显示,巢湖水体DOM包含3个组分:类蛋白质C1(Ex/Em=280/320)、类腐殖质C2(Ex/Em=285/380)和C3(Ex/Em=270(355)/450)。各组分荧光强度存在明显的时空分布特征,C1、C2和C3组分的荧光强度在夏季明显高于其他季节且在西湖区要显著高于湖心区和东湖区。皮尔逊(Pearson)相关性分析和冗余分析(RDA)表明,叶绿素(Chl-a)、总氮(TN)、总磷(TP)和温度(T)是影响C1、C2和C3组分时空变化的影响因子。DOM的荧光指数FI、生物源指数BIX和腐殖化指数HIX分别在1.96~2.83、0.83~1.18和1.35~5.36,表明各湖区水体DOM虽以自生源为主,但在夏季兼具陆源及内源的双重特征。研究表明,通过追踪巢湖水体DOM的组分、来源、时空分布规律及其响应机制,为富营养化湖泊的污染物控制和综合治理提供有力的科技支撑。To illuminate the properties and characteristics of dissolved organic matter(DOM)in Lake Chaohu,a typical eutrophic lake,a year-round survey was conducted from March 2021 to January 2022.Three-dimensional fluorescence spectroscopy combined with parallel factor analysis(PARAFAC)was conducted to investigate the composition,spatiotemporal distribution characteristics,sources of DOM,and its relationship with water environment factors.The results showed that the DOM in Lake Chaohu water contains of three fluorescent components:protein-like C1(Ex/Em=280/320),humic-like C2(Ex/Em=285/380)and C3(Ex/Em=270(355)/450).The fluorescence intensities of these components showed distinct spatiotemporal distribution characteristics,with C1,C2,and C3 fluorescence intensities being significantly higher in the summer than in other seasons and markedly higher in the West Lake area compared to the Central and East Lake areas.The results of Pearson correlation analysis and redundancy analysis(RDA)indicated that chlorophyll(Chl-a),total nitrgen(TN),total phosphorus(TP),and temperature(T)are influencing factors of the spatiotemporal changes of C1,C2,and C3 components.The fluorescence indices of DOM,including the fluorescence index(FI),biological source index(BIX),and humification index(HIX),ranged from 1.96 to 2.83,0.83 to 1.18,and 1.35 to 5.36,respectively,indicating that while autochthonous sources dominate the DOM in the lake water,terrestrial and endogenous sources also contribute significantly during the summer.The research findings demonstrated that by tracking the composition,sources,spatiotemporal distribution patterns,and response mechanisms of DOM in the water of Lake Chaohu,strong scientific and technological could be provided support for the control and integrated management of pollutants in eutrophic lakes.

关 键 词：溶解性有机质(DOM) 平行因子(PARAFAC)分析 荧光组分 时空动态 巢湖 

分 类 号：X524[环境科学与工程—环境工程]