岩矿测试2025，Vol.44Issue(2)：316-329,14.DOI:10.15898/j.ykcs.202405240120
人工无本底土壤培养实验下GDGTs的含量与分布特征
Abundance and Distribution of GDGTs in Incubated Artificial Soils with No Fossil Pool
摘要
Abstract
Glycerol dialkyl glycerol tetraethers(GDGTs)derived from microorganisms are important tools for the study of paleoclimate changes.Incubation experiments are helpful to clarify the mechanisms for the responses of GDGTs to environmental parameters,and to test the reliability of related climatic proxies.However,previous GDGT incubation experiments were mainly conducted on a single strain or suffered from the influence of a background signal,hampering systematically understanding the precise response of this biomarker to environmental factors in a soil environment.In this paper,artificial soils without GDGTs were incubated under the same temperature but different soil water content(SWC)conditions.The results showed that:(1)The abundances of GDGTs were positively correlated with SWC,but phosphate buffer could inhibit the production of GDGTs;(2)The branched and isoprenoid tetraether index(BIT),a soil moisture proxy developed in natural soils,was not significantly correlated with SWC;(3)6-methyl brGDGTs were more abundant than 5-methyl brGDGTs,resulting in extremely high values of MBT'5ME and low MBT'.The results suggest that the BIT soil moisture proxy may indirectly(rather than directly)respond to SWC changes and confirm that high relative abundance of 6-methyl brGDGTs can affect the applicability of the MBT'5ME paleothermometer in soils.The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202405240120.关键词
GDGTs/培养实验/高分辨质谱/土壤湿度指标/温度指标Key words
GDGTs/incubation experiment/high resolution mass spectrometry/soil moisture proxy/temperature proxy分类
天文与地球科学引用本文复制引用
苗瑞,赵增浩,蔡泽园,刘旭,王欢业..人工无本底土壤培养实验下GDGTs的含量与分布特征[J].岩矿测试,2025,44(2):316-329,14.基金项目
国家自然科学基金项目(42122021) （42122021）
国家重点研发计划项目(2023YFF0804300) （2023YFF0804300）
中国科学院青年创新促进会会员项目(2019403) （2019403）
