GDGTs在古环境重建中的气候指示意义
Climate Indicative Significance of GDGTs in Paleoenvironment Reconstruction
DOI: 10.12677/aep.2026.167133, PDF,   
作者: 宋兴超：云南师范大学地理学部，云南 昆明
关键词: GDGTs；指标；古环境重建；指示意义；GDGTs； Indicators； Paleoenvironmental Reconstruction； Indicative Significance
摘要: 甘油二烷基甘油四醚脂类(GDGTs)是古菌和细菌细胞膜的重要组成部分，其分子组成会随环境温度、pH等因素的变化而发生适应性调整，因而成为古环境重建的重要生物标志物。基于类异戊二烯GDGTs (isoGDGTs)的TEX86指标已广泛应用于海水和湖泊表层温度重建；基于支链GDGTs (brGDGTs)的环化指数(CBT)和甲基化指数(MBT)可有效反映环境pH和大气温度变化；近年来发展的羟基化GDGTs (OH-GDGTs)则展现出在低温环境和底层水温重建中的独特优势。陆源输入指数BIT可用于区分GDGTs的海源与陆源贡献。目前，基于GDGTs的研究已在全球海洋、湖泊、土壤等环境中广泛开展，GDGTs已成为古温度、古水文、古环境重建的重要工具。本文系统梳理了GDGTs的化学结构、生物来源、主要环境指标及其气候指示意义，总结了不同指标在实际应用中的优势与局限，并对未来研究方向进行了展望。
Abstract: Glyceryl dialkyl glycerol tetraether lipids (GDGTs) are important components of archaea and bacterial cell membranes. Their molecular composition adapts to changes in environmental temperature, pH, and other factors, thus becoming important biomarkers for paleoenvironment reconstruction. The TEX86 index based on isoprene-like GDGTs (isoGDGTs) has been widely used in the reconstruction of seawater and lake surface temperatures; the cyclization index (CBT) and methylation index (MBT) based on branched GDGTs (brGDGTs) can effectively reflect changes in environmental pH and atmospheric temperature; and the hydroxylated GDGTs (OH-GDGTs) developed in recent years have shown unique advantages in the reconstruction of low-temperature environments and bottom water temperatures. The terrestrial input index (BIT) can be used to distinguish between marine and terrestrial contributions of GDGTs. Currently, research based on paleotemperature and paleohydrology (GDGTs) has been widely conducted in global marine, lake, and soil environments, and GDGTs have become important tools for paleotemperature, paleohydrological, and paleoenvironmental reconstruction. This paper systematically reviews the chemical structure, biological origin, main environmental indicators, and climate indicative significance of GDGTs, summarizes the advantages and limitations of different indicators in practical applications, and provides an outlook on future research directions.
文章引用：宋兴超. GDGTs在古环境重建中的气候指示意义[J]. 环境保护前沿, 2026, 16(7): 1327-1333. https://doi.org/10.12677/aep.2026.167133

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