湖泊科学2025，Vol.37Issue(6)：2090-2103,14.DOI:10.18307/2025.0628
我国北方典型湖库水体溶解性有机质赋存特征及影响因素
Distribution characteristics and environmental controls of dissolved organic matter in typi-cal lakes and reservoirs in northern China
摘要
Abstract
Dissolved organic matter(DOM)is pivotal in aquatic ecosystems and biogeochemical cycles.Understanding the compo-sition characteristics,sources,and influencing factors of DOM in typical lakes and reservoirs across northern China is crucial for ef-fective organic matter pollution control and safe water transfer.This study collected 130 surface water samples from eight represent-ative water bodies:Lake Xiaoxingkai,Lake Songhua,Dahuofang Reservoir,Guanting Reservoir,Yuqiao Reservoir,Lake Baiyang-dian,Lake Hengshui,and Lake Nansi.The key findings are as follows:(1)Through parallel factor analysis(PARAFAC),three distinct fluorescent components were identified in the DOM of these lakes and reservoirs:humic-like substances(C1),tryptophan-like substances(C2),and tyrosine-like substances(C3).DOM in northern lakes and reservoirs exhibited strong humification characteristics with relatively low autochthonous contributions,while those in northern China demonstrated pronounced autochtho-nous features.Notably,Lake Baiyangdian displayed unique DOM characteristics with higher DOM content and protein-like compo-nents than other studied water bodies.(2)Humic-like substances from anthropogenic sources significantly positively correlated with CODMn and humification index(HIX).Protein-like components(C2,C3)showed significant positive correlations with dis-solved organic carbon,fluorescence index,and autogenetic index but negative correlations with HIX.DOM components correlated more strongly with nitrogen than phosphorus nutrients.(3)A larger watershed area extends the retention time of DOM in lakes,promoting the accumulation of endogenous DOM components,while deeper water bodies facilitate the preservation of DOM.Elevat-ed temperatures enhance the in-lake transformation of DOM,intensifying its endogenous characteristics and reducing its exogenous features.In regions with higher precipitation,rainfall-runoff transports terrestrial humic-like substances into water bodies,increas-ing the exogenous DOM signature.Aquatic vegetation and microorganisms predominantly influence DOM dynamics through endoge-nous processes,collectively regulating nutrient cycling and ecological functions in aquatic systems.Human activities introduce sub-stantial amounts of organic matter into water bodies,altering the characteristics of DOM.Agricultural practices enhance the endog-enous DOM signature by stimulating microbial metabolism;areas with high vegetation coverage contribute more terrestrial humic-like components to water bodies;and urban areas introduce substantial amounts of organic matter and pollutants,modifying the composition and characteristics of DOM.关键词
北方湖库/溶解性有机质/平行因子分析(PARAFAC)/相关性分析/冗余分析(RDA分析)Key words
Northern lakes and reservoirs/dissolved organic matter/parallel factor analysis(PARAFAC)/correlation analysis/redundancy analysis(RDA)引用本文复制引用
黄鑫鑫,焦立新,刘亚萍,程云轩,张渝婷,刘静,冯雅茹..我国北方典型湖库水体溶解性有机质赋存特征及影响因素[J].湖泊科学,2025,37(6):2090-2103,14.基金项目
国家科技基础性工作专项(2015FY110900-005)资助. （2015FY110900-005）
