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引用本文:沈丽丽,孙婷婷,郭晓宇,黄涛.南极湖泊沉积物中有机硫组成及其与铁硫化物的联系.湖泊科学,2022,34(1):142-150. DOI:10.18307/2022.0113
Shen Lili,Sun Tingting,Guo Xiaoyu,Huang Tao.Organic sulfur compositions and their relationships with iron sulfides in Antarctic lake sediments. J. Lake Sci.2022,34(1):142-150. DOI:10.18307/2022.0113
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南极湖泊沉积物中有机硫组成及其与铁硫化物的联系
沈丽丽, 孙婷婷, 郭晓宇, 黄涛
安徽大学资源与环境工程学院, 湿地生态保护与修复安徽省重点实验室, 合肥 230601
摘要:
本文利用有机硫硫同位素组成(δ34Sorg)及活性铁的黄铁矿化度(DOP)和硫化度(DOS)研究了南极阿德雷岛受企鹅活动影响的Y2湖和未受影响的菲尔德斯半岛燕鸥湖YO沉积物中有机硫的来源组成及其与铁硫化物的联系.结果表明,Y2沉积物1~15 cm较低的δ34Sorg指示有机质硫化形成的贫34S成岩有机硫(Sdiag)占比较高,其中在8~15 cm较高的DOS指示铁硫化物形成和有机质硫化同时发生,源于该层位高含量的活性铁供给.Y2剖面48~56 cm沉积物有机硫富集34S显著,对应于企鹅数量高峰期,表明大量企鹅粪的外部输入使沉积物中富34S的生物有机硫(Sbio)快速增加,并超过了内部硫转化过程中成岩有机硫的增加.YO沉积物在28 cm处δ34Sorg显著降低,主要是由于该层位硫酸盐异化还原强,有机质硫化形成的大量Sdiag成为有机硫的主要成分,同位素质量平衡计算结果显示该层位Sdiag占比高达95.4%;同时,28 cm处较高的DOP指示沉积物黄铁矿的形成与有机质硫化同时发生,主要源自沉积物中高硫酸盐还原强度产生了足够多的硫化氢前体.本研究表明,有机硫组分的来源转化与有机质、活性铁紧密耦合,对区域湖泊有机质成岩埋藏及潜在的气候环境效应具有重要的指示意义.
关键词:  硫同位素  硫化度  黄铁矿化度  生物有机硫  成岩有机硫
DOI:10.18307/2022.0113
分类号:
基金项目:国家自然科学基金项目(41476165)和安徽省高校自然科学研究重点项目(2019KJ0042)联合资助.
Organic sulfur compositions and their relationships with iron sulfides in Antarctic lake sediments
Shen Lili, Sun Tingting, Guo Xiaoyu, Huang Tao
Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration, School of Resources and Environment Engineering, Anhui University, Hefei 230601, P. R. China
Abstract:
Sulfur isotope ratios of organic sulfur (δ34Sorg), degrees of pyritization (DOP) and sulfurization (DOS) in sediments were analyzed to reveal the organic sulfur compositions and their relationships with iron sulfides in a penguin-affected lake Y2 and a pristine Yanou Lake (YO) at Ardley Island and Fildes Peninsula, Antarctica, respectively. The depleted δ34Sorg values in Y2 sediments of 1-15 cm indicated a high proportion of 34S-depleted diagenetic organic sulfur (Sdiag) in total sulfur. Meanwhile, the high DOS in Y2 sediments of 8-15 cm indicated a concurrent sulfurization of iron and the organic matter, likely due to the high availability of active iron in this layer. The observed much enriched δ34Sorg in Y2 sediments of 48-56 cm corresponding to the period of high penguin populations, which indicated that large external inputs of penguin guanos result in a rapid increase in 34S-enriched biological organic sulfur (Sbio) in the sediments, and exceeds the Sdiag that from the internal sulfur transformations. The depleted δ34Sorg in YO sediment of 28 cm indicates a high proportion (95.4%) of 34S-depleted Sdiag which was from strong sulfurization of organic matter, corresponding to the strongest sulfate reduction in this layer. Meanwhile, the high DOP in YO sediment of 28 cm indicated a concurrent formation of pyrite sulfur and the sulfurization of organic matter in this layer, due to the high available precursors of hydrogen sulfide and/or intermediate species of sulfur from the sulfate reduction. Our study indicates that the components of organic sulfur are coupled tightly with organic matter and reactive iron and provides a direct implication for the depositions of organic matter and thus the potential climatic and environmental effects in regional aquatic ecosystems.
Key words:  Sulfur isotope ratios  degree of sulfurization  degree of pyritization  biological organic sulfur  diagenetic organic sulfur
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