{"title":"Spatial differences of dissolved organic matter composition and humification in an artificial lake.","authors":"Jin Zhang, Jiajia Tan, Yingjie Wang","doi":"10.2166/wst.2024.267","DOIUrl":null,"url":null,"abstract":"<p><p>The depth-dependent dynamics of dissolved organic matter (DOM) structure and humification in an artificial lake limits the understanding of lake eutrophication and carbon cycling. Using fluorescence regional integration (FRI) and parallel factor analysis (PARAFAC) models to analyze the 3D fluorescence spectroscopy dataset, we revealed the depth-dependent structure and vertical distribution of DOM in the estuarine and center regions of Lake Hongfeng. The percentage fluorescence response (<i>P<sub>i,n</sub></i>) showed humic acid is an important part of DOM in Lake Hongfeng. Fluorescence results show that the fulvic-like and protein-like materials in HF1-DOM located at the estuarine position showed greater variation in the middle stage, probably due to human influence and sediment suspension. Fluorescence index (<i>P<sub>I</sub></i><sub>+<i>II</i>+<i>IV</i>,<i>n</i></sub>/<i>P<sub>III</sub></i><sub>+<i>V,n</i></sub> and FI<sub>C4</sub>/FI<sub>C3</sub>) can be used to indicate the degree of humification of DOM in artificial lakes. Results of each index show that the estuary is more affected by human activities, and the humification degree is significantly lower than that of the center of the lake. The evaluation index system of the humification degree of artificial lake established in this study can effectively predict the eutrophication state of the typical area of artificial lake and deeply understand the possible important influence of human activities on the carbon cycle of lake.</p>","PeriodicalId":23653,"journal":{"name":"Water Science and Technology","volume":null,"pages":null},"PeriodicalIF":2.5000,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water Science and Technology","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.2166/wst.2024.267","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/8/2 0:00:00","PubModel":"Epub","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
The depth-dependent dynamics of dissolved organic matter (DOM) structure and humification in an artificial lake limits the understanding of lake eutrophication and carbon cycling. Using fluorescence regional integration (FRI) and parallel factor analysis (PARAFAC) models to analyze the 3D fluorescence spectroscopy dataset, we revealed the depth-dependent structure and vertical distribution of DOM in the estuarine and center regions of Lake Hongfeng. The percentage fluorescence response (Pi,n) showed humic acid is an important part of DOM in Lake Hongfeng. Fluorescence results show that the fulvic-like and protein-like materials in HF1-DOM located at the estuarine position showed greater variation in the middle stage, probably due to human influence and sediment suspension. Fluorescence index (PI+II+IV,n/PIII+V,n and FIC4/FIC3) can be used to indicate the degree of humification of DOM in artificial lakes. Results of each index show that the estuary is more affected by human activities, and the humification degree is significantly lower than that of the center of the lake. The evaluation index system of the humification degree of artificial lake established in this study can effectively predict the eutrophication state of the typical area of artificial lake and deeply understand the possible important influence of human activities on the carbon cycle of lake.
人工湖中溶解有机物(DOM)结构和腐殖化的深度动态限制了对湖泊富营养化和碳循环的理解。利用荧光区域集成(FRI)和并行因子分析(PARAFAC)模型分析三维荧光光谱数据集,我们揭示了红枫湖河口区和中心区溶解有机物(DOM)随深度变化的结构和垂直分布。荧光响应百分比(Pi,n)表明腐植酸是红枫湖DOM的重要组成部分。荧光结果表明,位于河口位置的HF1-DOM中的类富营养化物质和类蛋白物质在中期变化较大,可能是受人为影响和沉积物悬浮的影响。荧光指数(PI+II+IV,n/PIII+V,n 和 FIC4/FIC3)可用来表示人工湖中 DOM 的腐殖化程度。各指标结果表明,河口受人类活动影响较大,腐殖化程度明显低于湖中心。本研究建立的人工湖腐殖化程度评价指标体系可有效预测人工湖典型区域的富营养化状态,深入了解人类活动对湖泊碳循环可能产生的重要影响。
期刊介绍:
Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.