Abundance and Distribution of GDGTs in Incubated Artificial Soils with No Fossil Pool

MIAO Rui; ZHAO Zenghao; CAI Zeyuan; LIU Xu; WANG Huanye

doi:10.15898/j.ykcs.202405240120

2025 Vol. 44, No. 2

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Article navigation > Rock and Mineral Analysis > 2025 > 44(2): 316-329

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MIAO Rui, ZHAO Zenghao, CAI Zeyuan, LIU Xu, WANG Huanye. Abundance and Distribution of GDGTs in Incubated Artificial Soils with No Fossil Pool[J]. Rock and Mineral Analysis, 2025, 44(2): 316-329. doi: 10.15898/j.ykcs.202405240120

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MIAO Rui, ZHAO Zenghao, CAI Zeyuan, LIU Xu, WANG Huanye. Abundance and Distribution of GDGTs in Incubated Artificial Soils with No Fossil Pool[J]. Rock and Mineral Analysis, 2025, 44(2): 316-329. doi: 10.15898/j.ykcs.202405240120

Abundance and Distribution of GDGTs in Incubated Artificial Soils with No Fossil Pool

1.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Xi’an Institute for Innovative Earth Environment Research, Xi’an 710061, China

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Corresponding author: WANG Huanye, wanghy@ieecas.cn

Received Date: 24 May 2024

Revised Date: 22 July 2024

Accepted Date: 24 July 2024

Available Online: 06 September 2024

Publish Date: 20 March 2025

Abstract

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.
- GDGTs /
- incubation experiment /
- high resolution mass spectrometry /
- soil moisture proxy /
- temperature proxy

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References

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