袁河流域沉积物中溶解性有机质的光谱特征  

Spectral Characteristics of Dissolved Organic Matter in Sediments from Yuanhe River Basin

作　　者：罗月萱 吕泽兰 晏彩霞 聂明华 王鹏[1] 丁明军[1] LUO Yue-xuan;LÜZe-lan;YAN Cai-xia;NIE Ming-hua;WANG Peng;DING Ming-jun(Key Laboratory of Poyang Lake Wetland and Watershed Research,Ministry of Education,School of Geography and Environment,Jiangxi Normal University,Nanchang 330022,China)

机构地区：[1]江西师范大学地理与环境学院,鄱阳湖湿地与流域研究教育部重点实验室,南昌330022

出　　处：《环境科学》2024年第8期4553-4564,共12页Environmental Science

基　　金：国家自然科学基金项目(42067058,42067034);江西省主要学科学术和技术带头人培养计划项目(20212BCJL23058);江西省杰出青年基金项目(20232ACB213014);江西省自然科学基金项目(20232BAB203083)。

摘　　要：溶解性有机质(DOM)对于指示水环境污染具有重要作用,而沉积物作为水环境内源污染的主要来源,研究沉积物DOM光谱特性对于解释该区域水环境污染具有重要意义.利用紫外-可见吸收光谱和三维荧光光谱,并结合平行因子分析法(PARAFAC),分析了袁河流域沉积物DOM的物质组成、来源特征及其影响因素.结果表明,袁河流域沉积物ω(TN)、ω(TP)和ω(OM)平均值分别为0.25、0.66和21.22 g·kg^(-1),随水流方向TN和TP含量呈增加趋势.袁河流域沉积物DOM主要为陆源输入,下游区域沉积物DOM的有色溶解性有机质浓度和芳香性明显高于上、中游区域.通过PARAFAC解析出3个腐殖质组分(C1、C3、C4)和1个类蛋白组分(C2),以腐殖质组分为主,荧光物质在下游区域更高.此外,干流及下游区域中沉积物理化性质对沉积物DOM光谱参数变化的解释量更高.其中,磷污染与沉积物DOM的陆源腐殖质具有同源性.以上结果说明在人类活动较强的区域范围内DOM光谱性质对水环境污染具有指示意义.Dissolved organic matter(DOM)plays an important role in indicating the pollution of the water environment,and sediment is the main source of endogenous pollution of the water environment.Research on the spectral characteristics of DOM in sediments was important for the interpretation of water environment pollution.In this study,UV-visible absorption spectroscopy and three-dimensional fluorescence spectroscopy combined with the parallel factor analysis(PARAFAC)were used to analyze the fluorescent components,sources,and influencing factors of DOM in sediments from the Yuanhe River Basin.The results showed that the average ofω(TN),ω(TP),andω(OM)in sediments from the Yuanhe River Basin were 0.52,0.66,and 21.22 g·kg^(-1),respectively.The concentrations of total nitrogen and total phosphorus increased along the flow direction.In addition,the sediment DOM from the Yuanhe River Basin mainly originated from terrestrial sources.The chromophoric DOM concentration and aromaticity of DOM from the downstream reaches were significantly higher than those from the upstream and midstream reaches.Based on PARAFAC,four fluorescent components of DOM in sediments from the Yuanhe River Basin were identified,including three humus-like components(C1,C3,and C4)and one protein-like component(C2).The sediment DOM was dominated by humus-like materials.Moreover,the fluorescent intensity of the fluorescent components was higher in the downstream reaches.Redundancy analysis revealed that the physicochemical properties of sediments in the mainstream and downstream reaches played a more significant role in the spectral properties of DOM.Phosphorus pollution and the terrestrial humus-like substance of sediment DOM were homologous.These results indicated that the spectral properties of DOM were the indicator of water environmental pollution in the region with strong anthropogenic influence.

关 键 词：溶解性有机质(DOM) 沉积物 紫外-可见吸收光谱 三维荧光光谱 袁河 

分 类 号：X522[环境科学与工程—环境工程]