甲藻甾醇在海洋和湖泊古环境重建中的应用

Application of Dinosterol in Marine and Lacustrine Environments:Implication for Paleoenvironment Reconstruction

甲藻甾醇(dinosterol)是甲藻(dinoflagellate)细胞膜脂的重要组分,作为甲藻的生物标志物,它具有来源特异性、结构稳定、抗降解能力强等特点,广泛分布于海洋、湖泊等各类沉积载体中,有效记录不同地质历史时期古环境的信息。目前,利用甲藻甾醇质量分数及其单体氢同位素组成开展重建早期生态环境变化的研究,为理解早期气候和环境变化、生态系统响应提供新视角,因此甲藻甾醇是近年来海洋和湖泊古环境重建研究的热点生物标志物之一。基于此,本文首先介绍甲藻甾醇的结构、生物来源及其在海洋、湖泊等环境的分布特征,简要概述且对比甲藻甾醇的几种纯化方法,并在阐述其重建古环境、古气候原理的基础上,进一步总结甲藻甾醇的古环境指示意义,特别是其质量分数在古生产力重建以及甲藻甾醇单体氢同位素组成在盐度、降水重建上的研究进展。据此,我们提出甲藻甾醇在古环境重建研究中应注意的问题,如甲藻甾醇的具体生物来源、环境因子对甲藻甾醇的影响等。

Dinosterol,also known as dinoflagellate sterol,is an important component of cell membrane lipids of dinoflagellate.As a biomarker of dinoflagellate,dinosterol is featured by high source specificity,structural stability,and resistance to degradation.It widely distributed in various sedimentary environments,such as oceans and lakes as well as peat,and this compound effectively records paleoenvironmental information from different geological periods.Currently,dinosterol and its hydrogen isotope composition have been used to reconstruct past ecological and environmental changes.The application of dinosterol provides a new perspective for understanding past climate and environmental changes and ecosystem responses.Therefore,dinosterol has become one of the key biomarkers in marine and lake paleoenvironmental reconstruction studies in recent years.Based on this,this paper first introduced the structure,biological sources,and distribution characteristics of dinosterol in marine and lake environments.It briefly outlined and compared several purification methods of dinosterol,and then explained the principles underlying its use in reconstructing paleoenvironments and paleoclimates.Furthermore,the paper summarized the paleoenvironmental implications of dinosterol,particularly its content in reconstructing paleoproductivity and its hydrogen isotope ratios in reconstructing salinity and precipitation.Accordingly,the paper also presented future considerations for dinosterol in paleoenvironmental reconstruction studies,such as the specific biological sources of dinosterol and the impact of environmental factors on dinosterol.