河流输入决定着水源地水库DOM组成的时空变异  

River Inputs as Determining Factor for the Spatiotemporal Variations of DOM Composition in Drinking Water Source Reservoirs

作　　者：张辰雪 段梦伟 严诺霄 仇志强 唐登淼 刘东 ZHANG Chen-xue;DUAN Meng-wei;YAN Nuo-xiao;QIU Zhi-qiang;TANG Deng-miao;LIU Dong(School of Geographical Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang 110168,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Urban and Environmental Sciences,Northwest University,Xi'an 710127,China;Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Northwest University,Xi'an 710127,China)

机构地区：[1]南京信息工程大学地理科学学院,江苏南京210044 [2]中国科学院南京地理与湖泊研究所,中国科学院流域地理学重点实验室,江苏南京210008 [3]沈阳建筑大学交通与测绘工程学院,辽宁沈阳110168 [4]中国科学院大学,北京100049 [5]西北大学城市与环境学院,陕西西安710127 [6]西北大学陕西省地表系统与环境承载力重点实验室,陕西西安710127

出　　处：《光谱学与光谱分析》2025年第4期1175-1182,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(42271376);中国科学院青年创新促进会(2021313)资助。

摘　　要：流域经济发展会对饮用水源地水库的水质产生剧烈影响,其中一个重要方面是通过河流输入加剧溶解性有机物(DOM)污染,而关于河流输入对水源地水库DOM组成时空变异影响尚缺乏系统研究。基于不同季节溧阳沙河水库及入库河流的同步现场采样,通过对有色溶解有机物(CDOM)三维荧光光谱的平行因子分析等方法,探究了沙河水库中DOM组成的时空变异特征及河流输入的影响。结果表明:(1)水库DOM包含腐殖质C1、类蛋白酪氨酸C2、类蛋白色氨酸C3和陆源腐殖质C4四种组分,且C2在大部分点位的占比超过50%。(2)水库DOM组成具有十分明显的季节变化特征,腐殖质DOM组分含量均在春季时最低;对主要组分C2,春夏秋冬含量分别为53.11%、35.22%、60.05%和57.88%。(3)河流输入对水库DOM空间分布具有决定性影响,除了主要来源于生活污水的酪氨酸组分C2,其他组分含量均在河口区域较高。尽管河流向水库输入的DOM以陆源腐殖质C1为主(春夏秋冬占比分别为28.80%、30.51%、27.11%和22.19%),但沙河水库DOM腐殖质化程度较低,即沙河水库DOM以自生源为主。水库自生源DOM主要与藻类增殖有关,类蛋白色氨酸C3组分与叶绿素(Chl-a)含量线性显著正相关(R2=0.51,p<0.01)。这些研究结果对改善水源地水库水质、降低有机污染和保障居民饮用水安全具有十分重要的意义。A watershed s economic development can significantly impact the water quality of drinking water reservoirs,with one important aspect being the exacerbation of dissolved organic matter(DOM)pollution through river inputs.However,there is a lack of systematic studies on the spatiotemporal variability of DOM composition in drinking water reservoirs due to river inputs.Based on synchronous field sampling of the Shahe Reservoir and its inflowing rivers during different seasons,this study explored the spatiotemporal variation characteristics of DOM composition and the influence of river inputs using methods such as parallel factor analysis of three-dimensional fluorescence spectra of colored dissolved organic matter(CDOM).We obtained the following results.①Reservoir DOM contained four components:humic substance C1,protein-like tyrosine C2,protein-like tryptophan C3,and terrestrial humic substance C4,with C2 accounting for over 50%of the proportion at most sampling points.②The composition of reservoir DOM exhibited significant seasonal variation,with humic substance DOM components being lowest in spring;for the main component C2,the content proportions in spring,summer,autumn,and winter were 46.66%,34.58%,54.74%,and 56.00%,respectively.③River inputs had a decisive impact on the spatial distributions of reservoir DOM,with the contents of components other than tyrosine,the main source of which was domestic sewage,being higher in the river mouth area.Although the DOM input from rivers to reservoirs was mainly terrestrial humic substance C1(with proportions of 28.80%,30.51%,27.11%,and 22.19%in spring,summer,autumn,and winter,respectively),the degree of humification of DOM in Shahe Reservoir was low,indicating that autochthonous sources dominated the DOM in the reservoir.Autochthonous DOM in the reservoir was mainly related to algal proliferation,and the component of protein-like tryptophan C3 was linearly significantly positively correlated with chlorophyll-a content(R 2=0.51,p<0.01).This study is of great significance

关 键 词：沙河水库 溶解性有机物 有色溶解性有机物 三维荧光光谱 平行因子分析 

分 类 号：X143[环境科学与工程—环境科学]