摘要
为了研究银川市湿地表层水体中溶解性有机质(DOM)的光谱特征、空间分布及其来源,对银川市20个采样点采集的186个湿地表层水样进行了三维荧光光谱技术(EEMs)结合区域积分法(FRI)、平行因子分析法(PARAFAC)以及荧光指数法的分析。结果表明,银川市湿地水体DOM主要包括6种组分:C1组分(类酪氨酸物质)相对含量最大,占41.21%,其次为C2(微生物腐殖质),占15.54%、C4(海洋腐殖质),占15.10%、C3(红移的陆地腐殖质),占10.30%、C5(类色氨酸物质),占10.69%,相对含最小为C6(未能分离的酪氨酸样和陆地腐殖质物质),占7.20%,DOM的组分信号为蛋白质主导型;空间分布结合主成分分析显示,银川市湿地水体各研究区域DOM差异显著,主要受到湿地开发利用程度,湖泊水源补给,周围土地利用类型的影响;荧光光谱特征参数分析结果显示,银川市湿地表层水体DOM的来源为陆源-自生源复合型,但自生源特征明显,且新生的DOM的比重较大。
In order to explore the sources,spatial distribution and spectral characteristics of the dissolved organic matter(DOM)in surface waters of Yinchuan wetlands,186 water samples were collected from 20 sampling sites.The samples were analyzed by the three-dimensional fluorescence spectroscopy(EEM),the fluorescence regional integration(FRI),the parallel factor analysis(PARAFAC),and the Fluorescence index method,respectively.The results revealed that six types of components exist in the DOM,including the C1 component(tyrosine-like humus)with the largest ratio(41.21%),the C2 moiety(microbial humus)accounting for 15.54%,the C4 component(marine humus)with the proportion of 15.10%,the C3(redshifted terrestrial humus,10.30%)and C5 components(tryptophan-like humus,10.69%),the C6 element(the mixture of tyrosine-like humus and terrestrial humus)with the lowest ratio of 7.20%.It is observed that the component of DOM was dominated by protein.Moreover,the combination of spatial distribution and principal component analysis indicated that there were significant disparities in different research regions of Yinchuan wetlands,which was mainly affected by the development level of the wetlands,the water supplies from the lake,as well as the land use type.The feature analysis of fluorescence spectra pointed out that the source of DOM in the surface waters of Yinchuan wetlands was a complex of terrigenous-authigenic mode,and the authigenic component was predominant with a major proportion of new DOM.
作者
陈继芬
贺子欣
党丽慧
王媚琳
史新琛
汪岭
丁润梅
田大年
CHEN Jifen;HE Zixin;DANG Lihui;WANG Meilin;SHI Xinchen;WANG Ling;DING Runmei;TIAN Danian(College of Public Health and Management,Ningxia Medical University,Yinchuan,750004,China;College of Basic Medical Sciences,Ningxia Medical University,Yinchuan,750004,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第8期2524-2534,共11页
Environmental Chemistry
基金
2019年宁夏医科大学优势学科群建设项目资助.
