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引用本文:申秋实,范成新,王兆德,张雷,刘成.湖泛水体沉积物-水界面Fe2+/ΣS2-迁移特征及其意义.湖泊科学,2016,28(6):1175-1184. DOI:10.18307/2016.0603
SHEN Qiushi,FAN Chengxin,WANG Zhaode,ZHANG Lei,LIU Cheng.Effects of Fe2+ and ΣS2- transportation at sediment-water interface to the black bloom formation. J. Lake Sci.2016,28(6):1175-1184. DOI:10.18307/2016.0603
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湖泛水体沉积物-水界面Fe2+/ΣS2-迁移特征及其意义
申秋实1,2, 范成新1,2, 王兆德1,2, 张雷1,2, 刘成1,2,3
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.湖泊与环境国家重点实验室, 南京 210008;3.中国科学院大学, 北京 100049
摘要:
湖泊水底Fe2+和ΣS2-浓度的快速增加是湖泛暴发最早发生于沉积物-水界面的主要前提,缺氧环境下水底扩散层附近Fe2+和ΣS2-的迁移是其在沉积物-水界面处稳定积累的重要原因.以蓝藻聚积水体沉积物-水界面为研究对象,应用湖泊过程模拟装置及间隙水被动采样等技术,重点研究了间隙水和底层上覆水中Fe2+和ΣS2-的垂向分布特征,并定量估算了二者的扩散通量及迁移方向.结果表明:湖泛样品水体沉积物-水界面处于典型的还原性环境,表层沉积物间隙水中Fe2+和ΣS2-浓度显著高于对照样品,二者在表层沉积物中积累趋势明显.湖泛水体沉积物-水界面处Fe2+释放通量较高,表现出较强烈的自沉积物向上覆水方向的释放能力;而湖泛样品ΣS2-在沉积物-水界面处释放通量为负,迁移方向为自上覆水向沉积物扩散.Fe2+和ΣS2-在湖泛水体沉积物-水界面处不同的迁移特征证明:缺氧/厌氧条件下,湖泊水体表层沉积物间隙水中高浓度Fe2+向上覆水的扩散为湖泛致黑物质的形成提供了重要的物质基础;底层上覆水及界面水中SO42-在表层沉积物中被还原,为终端还原产物ΣS2-为湖泛致黑物质的形成提供了另一重要物质来源.
关键词:  湖泛  沉积物-水界面  沉积物  湖泊  太湖
DOI:10.18307/2016.0603
分类号:
基金项目:国家自然科学基金项目(51409241)、国家高新技术研究发展计划“863”计划(2014AA06A509)和江苏省自然科学基金项目(BK20131464)联合资助.
Effects of Fe2+ and ΣS2- transportation at sediment-water interface to the black bloom formation
SHEN Qiushi1,2, FAN Chengxin1,2, WANG Zhaode1,2, ZHANG Lei1,2, LIU Cheng1,2,3
1.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing 210008, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
The rapid increase of Fe2+ and ΣS2- in bottom water layers is a fundamental premise to the outbreak of black blooms at sediment-water interface. Transportation in hypoxic/anoxic benthic diffusion boundary layer is the main cause for the bulk accumulation of Fe2+ and ΣS2-. In the present research, the sediment-water interface in the black bloom water system was studied, in which the vertical distribution characteristics of Fe2+ and ΣS2- in pore waters were mainly focused. The diffusion fluxes of Fe2+ and ΣS2- at the sediment-water interface were also calculated either. Results showed that the sediment-water interface was under typically reduced environment in the black bloom water system. The concentrations of Fe2+ and ΣS2- in surface pore waters of the black bloom samples were significantly higher than that of check samples without black blooms. Typical accumulation of Fe2+ and ΣS2- in the surface sediment of black bloom system was observed. The Fe2+ release flux at the sediment-water interface in black bloom samples was high, which implied strong Fe2+ release ability from sediments to the overlying water. However, unlike the Fe2+ and distinguished from the check samples, the ΣS2- release flux at the sediment-water interface in black bloom samples was in minus value, which indicated the ΣS2- in the overlying water might be transported into the sediment. The transport characteristics of Fe2+ and ΣS2- at the sediment-water interface demonstrated that the release of high concentration Fe2+ from surface pore waters provided important material source to the formation of the black bloom formation, whereas ΣS2--another important material source for the black bloom formation, was the production of reduction SO42- from overlying water at the sediment-water interface.
Key words:  Black bloom  sediment-water interface  sediment  lake  Lake Taihu
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