摘要
采用荧光光谱区域体积积分法定量研究洱海沉积物有色可溶性有机物(CDOM)三维荧光空间分布特性,结果表明,洱海沉积物CDOM中类腐殖酸组分占比最高(44.5%～74.2%),其次为溶解性微生物代谢产物(10.7%～20.4%)和类富里酸物质(8.19%～19.7%),而类蛋白组分占比最低,类腐殖酸占比与H/C和N/C均呈显著负相关;南部湖心平台区域沉积物类富里酸和类蛋白组分占比较高,其CDOM自生源占比较高;北部水生植物分布区溶解性微生物代谢产物占比较高,CDOM陆源性较强;中部深水区及南北湖湾区域类腐殖酸占比较高,随水深增加沉积物CDOM自生源特征增强.随沉积物深度增加类腐殖酸和溶解性微生物代谢产物占比呈下降趋势,类富里酸占比呈上升趋势,CDOM自生源特征增强,脂肪化程度增高.随湖泊富营养化程度增加沉积物CDOM受微生物代谢产物影响增强,陆源性增加,而自生源性降低,湖泊沉积物CDOM具有富营养化指示意义.
The Chromophoric Dissolved Organic Matter( CDOM) was analyzed quantitatively using fluorescence spectroscopy regional volume integral method. The spatial distribution characteristics of CDOM were studied by three-dimensional fluorescence spectroscopy in Lake Erhai sediments. The results showed that the highest proportion was the humic acid( ranging from 44.5% to 74.2% in sediments),followed by soluble microbial metabolites and fulvic acid with their content 10.7%-20.4% and 8. 19%-19.7%,respectively. The lowest was the class protein components. The proportion of humic acid was negatively correlated with H/C and N/C. The concentration of fulvic acid and the class protein components accounted for a relatively high proportion in the southern lake core platform,and CDOM had strongly self-origin. The dissolved microbial metabolites accounted for a relatively high proportion in the northern aquatic plant distribution area,and CDOM showed strongly terrestrial origin. The humic acids accounted for a relatively high proportion in the central deep water area and the north and south lake bays,with the increase of water depth,the self-origin characteristics of CDOM was increased in sediments. With the increase of sediment depth,the humic acid and soluble microbial metabolites was decreased,the fulvic acid was increased. The self-generated source characteristics and the degree of fatification of CDOM were increased. As the lake eutrophication increased,the influence of microbial metabolites on the CDOM of sediments was increased,and its terrestrial sources was increased will its self-generated source was reduced. The CDOM of lake sediments had the indicating significance to eutrophication.
作者
赵海超
李艳平
王圣瑞
焦立新
ZHAO Haichao;LI Yanping;WANG Shengrui;JIAO Lixin(College of Agricultural Science,Hebei North University,Zhangjiakou 075000,P.R.China;Chinese Research Academy of Environmental Sciences,Beijing 100012,P.R.China;College of Water Sciences,Beijing Normal University,Beijing 100875,P.R.China;Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed,Kunming 650034,P.R.China)
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2019年第2期507-516,共10页
Journal of Lake Sciences
基金
云南高原典型湖泊沉积物有机磷生物有效性项目(230200069)
国家高层次人才特殊支持计划项目(312232102)联合资助.
关键词
沉积物
CDOM
三维荧光光谱
空间分布
洱海
Sediments
chromophoric dissolved organic matter(CDOM)
three-dimensional fluorescence spectroscopy
spatial distribution
Lake Erhai
