青藏高原不同载体中微生物类脂物GDGTs的研究进展及展望

Progress and Prospects of Microbial Membrane Lipids GDGTs in Different Archives on the Qinghai-Xizang Plateau

甘油二烷基链甘油四醚是一类结构稳定、来源广泛、对气候环境响应敏感的微生物标志物,也是古气候与古环境重建的重要工具。相对于其他地区,青藏高原极端微生物对环境因子的响应机理复杂,不同载体中甘油二烷基链甘油四醚的分布特征不同,这给青藏高原古气候和古环境定量重建研究带来了不确定性,限制了甘油二烷基链甘油四醚在青藏高原研究中的充分应用。首先,总结了青藏高原不同载体中甘油二烷基链甘油四醚的分布特征、来源及影响因素;其次,概述了甘油二烷基链甘油四醚指标在青藏高原古气候环境重建中的应用,重点阐述了甘油二烷基链甘油四醚在青藏高原应用中的不确定性来源及其成因解释;最后,结合青藏高原多圈层相互作用对甘油二烷基链甘油四醚的影响机理,对青藏高原各载体中甘油二烷基链甘油四醚的研究进行了讨论和展望。

Glycerol Dialkyl Glycerol Tetraethers(GDGTs)are structurally stable,ubiquitously distributed,climate-sensitive microbial biomarkers that serve as important proxies for paleoclimatic and paleoenvironmental reconstruction.Compared to other regions,the extreme environment of the Tibetan Plateau triggers complex microbial responses that cause variations in GDGT distribution characteristics across various archives.These introduce uncertainties that limit the full potential of GDGTs in paleoclimate studies on the Tibetan Plateau.This paper summarizes the distribution,sources,and influencing factors of GDGTs in different Tibetan Plateau archives.It also outlines GDGT-based paleotemperature reconstructions,along with their associated uncertainties.The sources of uncertainty and their explanatory mechanisms are highlighted.Finally,considering the interactions between earth system spheres affecting GDGT proxies on the Tibetan Plateau,perspectives on GDGT research across the Tibetan Plateau archives are discussed,and future directions are proposed.