巢湖柱状沉积物中甘油二烷基甘油四醚脂(GDGTs)的组成特征
巢湖柱状沉积物中甘油二烷基甘油四醚脂(GDGTs)的组成特征
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DOI：
10.18307/2010.0320
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
房吉敦
中科院分区：
文献类型：
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作者：
王丽芳;李芸;熊永强;吴丰昌;房吉敦
甘油二烷基甘油四醚（GDGTs）是近年来生物地球化学研究的热点之一。 GDGT 的代理已成功用于重建许多海洋环境中的古环境和古气候，但其在湖泊环境中的应用非常有限。本研究通过分析巢湖核心沉积物中GDGTs的特征，为GDGTs在湖泊系统中的应用提供了有价值的参考。我们的研究表明，巢湖核心沉积物中分支GDGTs的代理获得的定量与巢湖流域环境温度和pH值等历史记录具有良好的一致性。类异戊二烯 GDGT 代理获得的量化结果与实际地表水温不同。沉积岩芯中可能存在不同来源。此外，与传统的湖泊总有机质参数如TOC、C/N比、δ^13C(下标org)和δ^15N值相比，GDGT代理具有更高的分辨率和更强的抗堵塞能力。因此GDGT可能是重建古环境和古气候的重要指标。
Glycerol dialkyl glycerol tetraethers (GDGTs) is one of the recent hotspot in biogeochemical study. The proxies from GDGTs have been used successfully to reconstruct paleoenvironment and paleoclimate in many marine environments, however, its application in lacustrine environment is very limited. This study provided a valuable reference for the application of GDGTs in lake systems by analyzing the characteristics of GDGTs in core sediment from Lake Chaohu. Our study suggested that the quantification that was obtained by the proxies from branched GDGTs in core sediment from Lake Chaohu had a good agreement with the historical record including environmental temperature and pH in Chaohu basin. The quantification obtained by the proxies from isoprenoid GDGTs differed from the actual surface water temperature. It was possible that there are different source in sediment core. In addition, compared with the traditional parameters of total organic matter in lake such as TOC, C/N ratios, δ^13C(subscript org) andδ^15N values, the proxies from GDGTs had higher resolution and stronger jam proof ability. So GDGTs may be a significant proxy to reconstruct paleoenvironment and palaeoclimate.