黄钰莹^1,2,,
裴宏业²,
李婧婧³,
党心悦²,
钱施²,
赵世锦²,
杨欢^1,2,,
1. 中国地质大学(武汉)流域关键带演化湖北省重点实验室, 湖北 武汉 430074
2. 中国地质大学(武汉)生物地质与环境地质国家重点实验室, 湖北 武汉 430078
3. 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 江苏 南京 210008

基金项目: 国家自然科学基金项目（批准号：41830319）资助


详细信息

作者简介: 黄钰莹, 女, 24岁, 硕士研究生, 地理学专业, E-mail: huangyuying1996@163.com

通讯作者: 杨欢, E-mail: yhsailing@163.com

中图分类号: P593;P534.63

收稿日期:2021-02-19
修回日期:2021-05-25
刊出日期:2021-07-30

Lipid-based pH proxies and their applications: Progresses and perspectives

HUANG Yuying^1,2,,
PEI Hongye²,
LI Jingjing³,
DANG Xinyue²,
QIAN Shi²,
ZHAO Shijin²,
YANG Huan^1,2,,
1. Hubei Key Laboratory of Critical Zone Evolution, China University of Geosciences(Wuhan), Wuhan 430074, Hubei
2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences(Wuhan), Wuhan 430078, Hubei
3. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu


More Information

Corresponding author: YANG Huan,E-mail:yhsailing@163.com

MSC: P593;P534.63

--> Received Date: 19 February 2021
Revised Date: 25 May 2021
Publish Date: 30 July 2021


摘要
摘要:pH是环境中影响生物地球化学过程的关键因子之一，其变化能够影响土壤肥力、改变环境微生物群落结构、影响海洋生物形成钙质骨骼和介壳等。不同沉积环境中pH的变化受控于不同的因素。对于地质历史时期一些重建起来难度较大的环境因素，如降雨量和大气CO₂浓度等的变化，pH能够充当"桥梁"的作用。通过重建沉积物或者水体中pH的变化进而间接实现对这些环境因子变化的反演。通过调查现代环境中生物脂类与环境关系等手段，已经逐渐发展起来一系列的环境pH代用指标，包括细菌支链型甘油二烷基甘油四醚化合物（GDGTs）的环化指标（CBT、CBT_5ME、CBT_6ME）和异构体指标IR（IR_6ME、IBT等）、革兰氏阴性菌3-羟基脂肪酸的RIAN、Branched Index、RIN指标、C₃₁藿烷的ββ/（αβ+ββ）立体异构体指标、长链正构2-烷基酮指标等。本文总结了基于生物脂类的pH指标其建立过程及应用原理，并对这些指标在古环境中的应用进行概述，归纳各自优缺点和应用范围，并提出了这些指标未来的研究方向。
关键词: pH/
代用指标/
GDGTs/
单醚类化合物/
3-羟基脂肪酸/
藿烷/
脂肪酮

Abstract:pH is one of the key factors affecting biogeochemical processes in diverse environments. For example, soil pH can affect soil fertility and exert a significant impact on the microbial community structures in soils. The seawater pH could influence the growth of marine calcareous planktons. Thus, pH records in the geological past could be useful in biogeochemical studies. In addition, pH could be used as a 'bridge' to reconstruct other environmental variables that are not readily reconstructed, e.g., mean annual precipitation(MAP) and pCO₂. To date, a series of pH proxies have been developed based on the investigation of the relationship between the distribution of lipid biomarkers and pH in a variety of geological settings. These proxies include the cyclization index of branched glycerol dialkyl glycerol tetraethers(brGDGTs; CBT, CBT_5ME, CBT_6ME, CBT'), the isomerization index of brGDGTs(IR_6ME, and IBT, etc.), 3-hydroxyl fatty acid-derived indices(RIAN, and Branched Index, etc.), C₃₁ hopane ββ/(αβ+ββ) ratio, and long-chain n-alkan-2-one-derived proxies. In this paper, we summarized the rationale for how these pH proxies were developed. The brGDGT-based pH proxies could be used in soils, lake sediments, stalagmites, as well as marine sediments. However, other lipid-based pH proxies could only be used in sediments where these proxies were initially developed, and it remains to be determined whether their applications could be extended to other geological settings. The pH range reconstructed from 3-hydroxyl fatty acid-derived proxies appears to be wider than GDGT-based pH proxies, suggesting that they could be used as pH proxies in extremely acid or alkaline sediments. Some lipid-based pH proxies, including TEX₈₆, and isoGDGT_IsomerIndex, could only be used to reconstruct environmental pH qualitatively because factors other than pH might also affect these indices. The brGDGT-based proxies have an advantage over other pH proxies, i.e., brGDGTs were ubiquitous in diverse environments but the distributions of other lipids, e.g. hopanes, MAGEs, n-alkan-2-one, were limited. We urge that the rationale of these lipid-based pH proxies should be made clear in the future study.
Key words:pH/
proxies/
GDGTs/
MonoAlkyl Glycerol Ether(MAGEs)/
3-hydroxy fatty acids/
hopane/
ketone



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