湖泊科学2024，Vol.36Issue(1)：165-176,中插2-中插3,14.DOI:10.18307/2024.0128
东北地区典型湖沼沉积物溶解态有机质组成特征及来源解析:以库里泡为例
Composition characteristics and source tracing of dissolved organic matter of lacustrine sediment in northeastern China:A case study of Lake Kulipao
摘要
Abstract
Dissolved organic matter(DOM)is one of the important components in lake sediment.Identifying the composition and sources of sediment DOM exerts great significance on the understanding of carbon biogeochemical processes and the eutrophication control of lake.To trace the source of sediment DOM in Lake Kulipao,samples of sediment and potential sources were collected in May and August 2021,including surface and core sediment samples,phytoplankton,macrophytes,C3 and C4 plants,livestock manure and treated effluent.Stable isotope(δ13C and δ15N)and fluorescence spectroscopy were applied to characterize the DOM composition of sediment and source samples.Furthermore,contribution rates of different sources to surface and core sediment DOM were calculated using IsoSource software.The calculation results showed that:(1)δ13C and δ15N of DOM in surface sediment dif-fered in May(average values of-25.54‰ and 9.02‰)and August(average values of-26.81‰ and 8.40‰).(2)δ13C and δ15N of DOM in core sediment differed in depth,with average values of-26.58‰ and 9.04‰ in depth of 0-3 cm and-25.40‰and 10.61‰ in depth of 3-30 cm.(3)Fluorescence components of surface sediment DOM were dominated by humic-like compo-nent(87.89％)in May,with HIX and BIX values of 6.27 and 0.67.In August,protein-like component increased to 49.58％with HIX and BIX values of 1.72 and 0.87.(4)Source analysis showed that allochthonous DOM(61％)dominated in surface sediment in May,with soil and treated effluent proportions of 21.40％and 18.08％,respectively.In August,proportion of autochthonous DOM increased to 55.10％,with a high contribution of emergent macrophyte(48.68％).(5)The DOM sources of core sediment showed no significant variation with depth,with treated effluent,submerged plant/algae and emergent macrophyte dominating the DOM with proportions of 42.13％,25.07％and 18.53％,respectively.In a whole,sources of sediment DOM in Lake Kulipao were mainly related to the human activities and climate features.This study can potentially improve the understanding of DOM accumula-tion and transportation in northeast watersheds of China.关键词
库里泡/沉积物/溶解态有机质/三维荧光光谱-平行因子分析/碳氮稳定同位素/来源解析Key words
Lake Kulipao/sediment/dissolved organic matter/EEM-PARAFAC/carbon and nitrogen stable isotope/source trac-ing引用本文复制引用
黄晏宇,刘婷婷,王桂燕,储昭升,高思佳,潘云凤,郑丙辉..东北地区典型湖沼沉积物溶解态有机质组成特征及来源解析:以库里泡为例[J].湖泊科学,2024,36(1):165-176,中插2-中插3,14.基金项目
国家重大科技专项(2017ZX07401003)资助. （2017ZX07401003）
