摘要
为了解生态脆弱的农牧交错地区典型湖泊岱海水体的溶解性有机质(DOM)的成分特征及其来源信息,使用三维荧光光谱(3DEEM)、平行因子分析模型(PARAFAC)和荧光吸收峰(B、T、A、M、C、D、N)对水体DOM荧光特征进行研究,探究岱海水体DOM荧光特征与环境因子的关系.结果表明,岱海水体整体呈弱碱性,营养盐浓度较高,有机污染严重.岱海水体DOM具有陆源与内源的双重特性,生物源组分占比较高.PARAFAC解析出3种组分:类色氨酸C1组分、微生物来源腐殖质C2组分和类酪氨酸C3组分.其中类色氨酸C1组分和微生物来源腐殖质C2组分占DOM总荧光强度的80%左右;荧光吸收峰分析结果显示,类蛋白荧光吸收峰(B、T、N)总占比为49.67%,陆源输入主要来源于密集的农业活动和流域生态环境的快速恶化.DOM的组成、转化过程主要与水体营养状态和高盐环境下的微生物过程密切相关,NH_(4)^(+)-N、DOP、TP、DO、高锰酸盐指数等环境因子在此过程中具有显著影响(P<0.05).通过揭示岱海水环境现状与DOM环境特征,可以岱海为例的寒旱区内陆湖泊的环境治理提供基础数据与思路.
The composition and source information of the aquatic dissolved organic matter(DOM)in the Daihai Lake,a typical saline lake at the ecologically fragile agro-pastoral area,were explored with three-dimensional excitation and emission matrix fluorescence(3DEEM),parallel factor analysis(PARAFAC),and fluorescence peaks(B,T,A,M,C,D,and N).Further,the relationship between aquatic DOM fluorescence characteristics and environmental factors were analyzed using correlation analysis in the Daihai Lake.The results showed that the water of Daihai was weakly alkaline,with high nutrient salt concentration and serious organic pollution.Two protein-like substances(C1 and C3)and one humic-like substance(C2)were identified using PARAFAC.The sum of C1+C2 accounted for 80%of DOM.The results of fluorescence peaks showed that the total percentage of protein-like fluorescence absorption peaks(B,T,and N)was 49.67%.Aquatic DOM of Daihai demonstrated both terrigenous and endogenous characteristics.Terrestrial inputs were mainly from intensive agricultural activities and rapid ecological degradation of the watershed leading to large amounts of organic matter entering the lake.The environmental behavior of DOM was highly correlated with the metabolic activity of organisms and nutrient status of lakes.NH_(4)^(+)-N,DOP,TP,DO,and permanganate index characterized the effect of the lake trophic state on DOM composition.DO,SAL,and Chla were mainly related to microbial metabolic processes(P<0.05).This study provides basic data and insights for the improvement of inland lake environments in saline lakes.
作者
王世欢
史小红
赵胜男
陶玉龙
孙标
冯伟莹
张生
WANG Shi-huan;SHI Xiao-hong;ZHAO Sheng-nan;TAO Yu-long;SUN Biao;FENG Wei-ying;ZHANG Sheng(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;National Positioning Observatory for Ecosystems in the Ulangsuhai Wetland,Bayannur 015000,China;Inland Lakes Research Institute for Cold and Arid Northern Areas in Hulunbuir,Hulunbuir 021000,China;School of Space and Environment,Beihang University,Beijing 100191,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2024年第11期6574-6582,共9页
Environmental Science
基金
内蒙古重点研发和成果转化计划项目(2021GG0089)
国家自然科学基金项目(52060022,52260028)。
