鹤地水库有色溶解性有机物来源与组成特征  

Characterizing sources and optical composition of chromophoric dissolved organic matter in Hedi Reservoir

作　　者：蔡启佳 耿征颜 孙瑞欣 苟婷 梁荣昌 赵瑞 冯雁辉 马千里 姚玲爱 CAI Qijia;GENG Zhengyan;SUN Ruixin;GOU Ting;LIANG Rongchang;ZHAO Rui;FENGYanhui;MA Qianli;YAO Ling′ai(South China Institute of Environmental Sciences,Ministry of Ecology and Environment(Institute of Ecological and Environmental Emergency Research,Ministry of Ecology and Environment),Guangzhou 510535;State Key Laboratory of Water Environment Simulation and Pollution Control,Guangzhou 510530)

机构地区：[1]生态环境部华南环境科学研究所(生态环境部生态环境应急研究所),广州510535 [2]国家环境保护水环境模拟与污染控制重点实验室,广州510530

出　　处：《环境科学学报》2024年第11期205-214,共10页Acta Scientiae Circumstantiae

基　　金：广州市科技计划项目(No.SL2022A04J01045);广东省水利科技创新项目(No.2024-01)。

摘　　要：鹤地水库作为湛江市集中式饮用水源地与环北部湾水资源配置工程重要节点,水环境与水生态变化对当地用水安全影响重大.有色溶解性有机物(CDOM)是水体有机物重要组成部分,其来源与组成不仅影响水质,也反映污染源特征.因此研究CDOM来源与组成特征对保障鹤地水库供水安全的管理工作有着重要支撑作用.在枯、平与丰水期采集鹤地水库水样,运用吸收光谱与荧光光谱等揭示鹤地水库CDOM的组成与来源的时空特征.结果显示,鹤地水库CDOM库中,陆源类腐殖质(32.2%~38.4%)、微生物源类腐殖质(26.6%~32.1%)与类色氨酸(25.2%~41.2%)贡献均衡,意味着鹤地水库受外源输入与内源自生的协同影响.时空分布特征显示上游九洲江、长径河与塘拱(丹兜)河是类腐殖质的主要贡献来源,自河口至库心类腐殖质递减;类色氨酸则随Chl a的分布特征而变化.结合相关性分析与冗余分析结果,类腐殖质与NH4+相伴输入(p<0.05),类色氨酸与藻类活动密切相关(p<0.05).相关研究结果可为鹤地水库营养状态判断与污染物质溯源提供有效指示作用.The Hedi Reservoir,as a key drinking water source and a pivotal component of the Beibu Gulf Water Resources Allocation Project,experiences environmental and ecological changes that significantly impact local water security.Chromophoric dissolved organic matter(CDOM)is a critical constituent of aquatic organic matter.Its sources and composition not only affect water quality but also reflect pollution characteristics.Therefore,investigating the sources and compositional traits of CDOM is essential for ensuring the safety of the Hedi Reservoir's water supply.This study collected Water samples from the Hedi Reservoir across dry,normal,and wet seasons and employed absorption and fluorescence spectroscopy to elucidate the spatial and temporal characteristics of CDOM composition and sources in the Hedi Reservoir.The results indicated that terrestrial humic substances(32.2%~38.4%),microbial humic substances(26.6%~32.1%),and tryptophan-like substances(25.2%~41.2%)contribute almost equally to the CDOM pool,suggesting that the reservoir is influenced by both external inputs and internal production.The Spatial and temporal distribution patterns revealed that the Jiuzhou,Changjing,and Tanggong Rivers,particularly upstream,are the primary sources of humic substances,with their influence decrease from the estuary to the reservoir’s center.In contrast,the distribution of tryptophan-like substances correlated with chlorophyll a(Chl a)levels.Correlation and redundancy analyses further indicated that humic substances are associated with NH4+input(p<0.05),while tryptophan-like substances are closely related to algal activity(p<0.05).These findings provide valuable indicators for evaluating the trophic state and identifying pollutant sources within the Hedi Reservoir.

关 键 词：鹤地水库 有色溶解性有机物(CDOM) 光谱特征 平行因子分析 

分 类 号：X522[环境科学与工程—环境工程]