海洋地质与第四纪地质2023，Vol.43Issue(6)：86-102,17.DOI:10.16562/j.cnki.0256-1492.2023040601
东海陆架海水和沉积物中藻类生物标志物的分布特征与比较
Characteristics and comparison of algal biomarkers in seawater and sediments of the East China Sea shelf
摘要
Abstract
Major algal biomarkers brassicasterol,dinosterol,and long-chain alkenones,representing diatoms,dinoflagellates,and haptophytes,respectively,were analyzed in seasonal suspended particles and surface sediments near Hangzhou Bay in the inland shelf of the East China Sea.The distribution characteristics and controlling factors of algal biomarkers in particles and sediments were studied.Results show that the spatial distribution characteristics of algal biomarkers in the surface sediments of the East China Sea inland shelf are obvious,and the abundances of algal biomarkers increase with the increase of water depth.The seasonal variation of algal biomarkers in particles is prominent,and the highest abundance in summer samples.Consistent with the results of previous studies,the temporal and spatial changes of biomarkers are mainly controlled by the changes of algae productivity.Due to the abundance of nutrients,high primary productivity is mainly distributed in the waters where the dilute water away from estuaries meets offshore currents.In summer,the coastal phytoplankton productivity is the highest due to the increased influence of nutrients carried by the diluted water of the Yangtze River.In addition,our results show a significant difference between the dominant sterols in surface sediments and particles.Brassicasterols dominate in particles,while dinosterols dominate in surface sediments.In addition to the common knowledge that the organic matter in particles mainly reflects the transient nature of local sites and in the surface sediment reflects the multi-year average of a wider area,we believed that the possible late hydrogenation of brassicasterol in sediments has a significant effect,leading to a significant decrease in brassicasterol abundances relative to dinosterol in the sediments.This study emphasized the complexity of sedimentary history of biomarkers in sediments.It is important to understand the relative changes of biomarkers in surface sediments for accurate interpretation of biomarkers in sedimentary records.关键词
水体悬浮颗粒物/表层沉积物/菜籽甾醇/甲藻甾醇/菜籽甾烷醇/东海陆架Key words
water suspended particles/surface sediments/brassicasterol/dinosterol/brassicastanol/East China Sea shelf分类
海洋科学引用本文复制引用
王婷男,贺娟,贾佳源,贾国东,陈岭娣,李丽..东海陆架海水和沉积物中藻类生物标志物的分布特征与比较[J].海洋地质与第四纪地质,2023,43(6):86-102,17.基金项目
国家自然科学基金面上项目"长江口外藻类生物标志化合物氢同位素与海洋盐度关系的研究"(41776049),"南海北部叶绿素氮同位素研究及古海洋学意义"(42276069) （41776049）
国家自然科学基金重点项目"南海浮游生态系统对上新世暖期气候的响应及其机制研究"(42030504)本研究的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(41849903)的资助.该航次(航次编号:NORC2019-03,NORC2021-03)由"浙渔科2"号/"润江1"号科考船实施,在此一并致谢. （42030504）
