海洋科学2023，Vol.47Issue(11)：24-34,11.DOI:10.11759/hykx20230327001
长江口及邻近海域沉积物中四醚脂类的来源及其对底层溶解氧指示作用探究
Source of tetraether lipids in sediments of the Changjiang River Estuary and adjacent sea:Indication of bottom water dissolved oxygen
摘要
Abstract
Glycerol dialkyl glycerol tetraethers(GDGTs),membrane lipids of archaea and certain bacteria,are widely distributed in marine water columns and sediments.Due to the temperature sensitivity of GDGTs,TEX86(TetraEther indeX of tetraethers comprising 86 carbons)is widely used in marine paleotemperature reconstruction.However,some evidences suggest that dissolved oxygen(DO)could also play an important role in determining GDGTs distributions in cultured archaeal strains,but how GDGTs composition in marginal sea surface sediments respond to DO levels has remained unclear.The composition of GDGTs both in particulate matters and surface sediments in the Changjiang River Estuary and adjacent sea area in summer were investigated in this study,to iden-tify the source of GDGTs in sediments and trace the responses of sedimentary GDGTs to bottom DO.This result showed that concentration of GDGTs in particulate matters increased with depth,and both the ratios of GDGT-2/GDGT-3 and GDGT-0/Cren in particulate matters of bottom layer were similar with those in surface sedi-ments,suggesting that the main source of sedimentary GDGTs are from the deposition of bottom particulate matter.Further studies found that after excluding stations that were heavily affected by terrestrial factors(BIT>0.2,the relative abundance of branched GDGTs and crenarchaeol),the relationships between GDGT-0/Cren and bottom DO(R2=0.57,P<0.01)showed significant positive correlation.This result suggests that GDGT-0/Cren can be potentially used to indicate the changes of bottom DO in the studied area.Further studies should be conducted by combining analysis of archaea communities with intact polar GDGTs to elucidate the driving mechanisms and applicability of GDGTs for DO indicating.关键词
GDGTs/溶解氧/长江口及邻近海域/指示作用Key words
GDGTs/dissolved oxygen/Changjiang River Estuary adjacent sea area/indication分类
海洋科学引用本文复制引用
王宗月,袁华茂,宋金明,贺志鹏,段丽琴,李学刚..长江口及邻近海域沉积物中四醚脂类的来源及其对底层溶解氧指示作用探究[J].海洋科学,2023,47(11):24-34,11.基金项目
中国科学院战略先导性专项(XDA23050501) （XDA23050501）
中国科学院大科学中心重点资助项目(COMS2019Q12)Project supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA23050501) （COMS2019Q12）
The Key Project of Center for Ocean Mega-Science of the Chinese Academy of Sciences(No.COMS2019Q12)本研究的数据及样品采集得到国家自然科学基金委员会共享航次计划项目(批准号:42149903)的资助,该航次(编号:NORC2022-03)由"中渔科 211"号科考船实施,在此一并致谢. （No.COMS2019Q12）
