摘要
本研究以长江中下游28个湖泊为研究对象,分析不同类型GDGTs化合物的分布特征,包括相对含量以及GDGTs各相关指标.并通过对比中国境内土壤GDGTs的分布情况,以探讨湖泊GDGTs的来源问题,研究结果表明:可能受产甲烷古菌的影响,这些浅水湖泊中古菌来源isoGDGTs与土壤存在较大差异,然而细菌来源的brGDGTs与土壤差异并不显著,据此推测很有可能来源于湖泊周边土壤的贡献.此外,这些受不同程度富营养化影响的湖泊表层沉积物GDGTs与水体化学参数的相关性分析结果显示,环境参数似乎并不能影响GDGTs的分布,然而水深与crenarchaeol之间存在显著正相关,表明在这些湖泊中,水深会影响古菌特别是奇古菌的分布.
In this study,it aims to examine the fractional abundance of GDGTs and GDGT-based proxies in 28 lakes in the middle and lower reaches of Yangtze River.It compares the GDGT distributions of these lakes with the published Chinese soil data to determine the lacustrine GDGT sources.The results indicate that there are different distributions of isoGDGTs between lake sediments and soils,however,the brGDGT distributions show no significant difference between lake sediments and soils,indicating that brGDGTs from lacustrine sediments may come from soils surrounding the lakes.It further measured the relationship between chemical parameters and GDGT distributions of these lakes affected by varying degrees of eutrophication.Our results show that only the water depth displays significant correlation with crenarchaeol,which implies that water depth may influence the production of Thaumarchaeota in these lake environments.
作者
李婧婧
郑峰峰
徐敏
杨欢
Li Jingjing;Zheng Fengfeng;Xu Min;Yang Huan(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Department of Ocean Science&Engineering,Southern University of Science and Technology,Shenzhen 518055,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2023年第11期4335-4348,共14页
Earth Science
基金
国家自然科学基金项目(No.41977384)
江苏省基础研究计划(自然科学基金)面上项目(No.BK20181508)
中国地质大学(武汉)流域关键带湖北省重点实验室开放基金项目(No.2021F06).
关键词
长江中下游湖泊
GDGTs
浅水湖泊
来源
水文地质
环境地质
lakes in middle and lower reaches of Yangtze River
GDGTs
shallow water
sources
hydrogeology
environmental geology
作者简介
李婧婧(1984-),女,助理研究员,主要从事湖泊分子地球化学研究.ORCID:0000⁃0003⁃4357⁃8665.E⁃mail:jjli@niglas.ac.cn。
