细菌藿四醇异构体BHT-x:海洋水体缺氧的新型代用指标  

The application progress of BHT-x as biomarker to marine hypoxia

作　　者：朱犇 董良[1] ZHU Ben;DONG Liang(School of Oceanography,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋学院,上海200240

出　　处：《海洋地质与第四纪地质》2024年第6期152-162,共11页Marine Geology & Quaternary Geology

基　　金：国家“十三五”重点研发计划“近海脱氧环境微型生物代谢对碳源汇的影响”(2020YFA06083002);国家自然科学基金“海洋奇古菌完整极性细胞膜脂GDGTs与氨氧化速率关系研究”(42072332)。

摘　　要：海洋缺氧是当前人类面临的重大生态环境问题之一,对海洋生物、元素循环及全球气候变化都产生了重要影响。细菌藿多醇(bacteriohopanepolyols,BHPs)是一种来源于细菌细胞膜的五环三萜类化合物,也是地质体中普遍存在的藿烷类化合物的生物前体物质,作为生物标志物被广泛应用于示踪陆源有机质,指示好氧甲烷氧化等生态过程。本文聚焦于BHPs中重要的一种脂类化合物—BHT-x(细菌藿四醇异构体之一),总结了其生物来源及验证过程,并简介了目前BHT-x ratio作为水体缺氧代用指标在海洋环境中的应用研究。利用BHT-x来重建长时间尺度的缺氧现象,可以帮助我们更好地认识海洋缺氧过程,为我们预测和应对未来海洋环境的变化提供更多的理论依据。Marine hypoxia is one of the major ecological and environmental problems at present as it has important impact on marine organisms,chemical element cycle,and global climate.Bacteriohopanepolyols(BHPs)are a group of pentacyclic triterpenoid compound derived from bacterial cell membranes,and also the biological precursor of hopane that are ubiquitous in geological records.BHPs have been widely used as a biomarker in tracing terrestrial organic matter and indicating aerobic methane oxidation.By focusing on bacteriohopanetetrol(BHT)-x,an important member of BHPs that could be used to indicate anaerobic ammonia oxidation and water hypoxia,we reviewed its biological origination and the verification,and briefly introduced the application of the BHT-x ratio(the ratio of BHT-x over total BHT)as a proxy of water column hypoxia for different marine environments,including samples of suspended particles and sediments.The application of BHT-x could help us reconstruct marine hypoxia evolution,and predict and protect the modern marine environment with richer theoretical evidence.

关 键 词：细菌藿多醇 海洋缺氧 BHT-x 厌氧氨氧化 

分 类 号：P736.4[天文地球—海洋地质]