| 东海季节性低氧海区柱状沉积物中氧化还原敏感元素对沉积环境变化的响应 |
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| 引用本文： | 解兴伟,袁华茂,宋金明,段丽琴,梁宪萌,王启栋,任成喆,王越奇.东海季节性低氧海区柱状沉积物中氧化还原敏感元素对沉积环境变化的响应[J].海洋学报,2020,42(2):30-43. |
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| 作者姓名： | 解兴伟 袁华茂 宋金明 段丽琴 梁宪萌 王启栋 任成喆 王越奇 |
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| 作者单位： | 1.中国科学院海洋研究所 海洋生态与环境科学重点实验室，山东 青岛 266071 |
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| 基金项目： | 青岛海洋科学与技术试点国家实验室鳌山科技创新计划项目“近海生态灾害发生机理与防控策略”（2016ASKJ02-4）；山东省重大科技创新工程专项“近海富营养化及其生态灾害环境驱动作用”（2018SDKJ0504-1）；国家基金委面上项目“长江口邻近海域痕量元素沉积物-水界面迁移及对缺氧环境的响应”（41676068）。 |
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| 摘 要： | 氧化还原敏感元素(Redox Sensitive Elements，RSE)如V、Cr、Mo、U等，通常在氧化条件下呈溶解态，在还原沉积环境中除Fe、Mn外，RSE被还原成低价态转移至沉积物中富集积累，因此可以利用氧化还原敏感元素在沉积物中的富集情况反演沉积环境的氧化还原状况。本文通过研究东海内陆架季节性低氧海区Zb7沉积柱中氧化还原敏感元素V、Cr、Ni、Cu、Zn、Mo、U的垂直分布、富集特征和比值，探究沉积环境氧化还原状况；发现RSE/Al和富集系数自1978年以来呈增加的趋势，但自2009年开始有所降低，整体RSE富集系数均小于3，未见明显富集。RSE比值V/Cr<2、Ni/Co<5、U/Th<0.75、0.25<(Cu+Mo)/Zn<0.55，以及MoEF/UEF比值主要分布在0.08～0.3倍海水Mo/U值之间，均指示氧化的沉积环境。RSE/Al与Fe/Al、Mn/Al具有显著的相关性，表明RSE在剔除陆源碎屑输入后，主要通过与Fe、Mn氧化物结合进入沉积物，也指示氧化的沉积环境。研究结果与该区域溶解氧历史数据反映的季节性低氧结果不一致，可能与RSE在夏季季节性低氧时，沉积物中的富集信号在秋冬季溶氧水平恢复后缺失有关。尽管RSE不能有效指示东海季节性低氧环境，但Zb7沉积柱RSE在1978年后富集程度的增加以及2011年后的降低，在一定程度上反映了该区域自1978年后季节性低氧程度加重，2009年后又有所缓解的变化趋势。
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| 关 键 词： | 氧化还原敏感元素 沉积环境 海洋沉积物 季节性低氧 东海 |
| 收稿时间： | 2019/2/18 0:00:00 |
| 修稿时间： | 2019/12/9 0:00:00 |
Response of redox sensitive elements to changes of sedimentary environment in core sediments of seasonal low-oxygen zone in East China Sea |
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| Xie Xingwei,Yuan Huamao,Song Jinming,Duan Liqin,Liang Xianmeng,Wang Qidong,Ren Chengzhe and Wang Yueqi.Response of redox sensitive elements to changes of sedimentary environment in core sediments of seasonal low-oxygen zone in East China Sea[J].Acta Oceanologica Sinica (in Chinese),2020,42(2):30-43. |
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| Authors: | Xie Xingwei Yuan Huamao Song Jinming Duan Liqin Liang Xianmeng Wang Qidong Ren Chengzhe and Wang Yueqi |
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| Institution: | 1.Key Laboratory of Marine Ecology and Environmental Sciences of Chinese Academy Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China2.University of Chinese Academy of Sciences, Beijing 100049, China3.Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China |
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| Abstract: | Redox sensitive elements (Redox Sensitive Elements, RSE) such as V, Cr, Mo and U, et al. are dissolved under oxidation conditions. They are reduced to low-valent state under reducing sedimentary environment and transferred to sediments for enrichment and accumulation. Therefore, the enrichment of redox sensitive elements in sediments can be used to invert the redox status of sedimentary environment. In this paper, the vertical distribution, enrichment characteristics and ratios of redox sensitive elements V, Cr, Ni, Cu, Zn, Mo and U in the Zb7 core sediment in the seasonal low-oxygen sea area of East China Sea were studied. It was found that RSE/Al and enrichment coefficient had increased since 1978, but had decreased since 2009. The overall RSE enrichment coefficient was less than 3, and no obvious enrichment had been observed. RSE ratios V/Cr<2, Ni/Co<5, U/Th<0.75, 0.25<(Cu+Mo)/Zn<0.55 and MoEF/UEF ratios were mainly distributed between 0.08 and 0.3 times of seawater Mo/U ratios, indicating the oxidized sedimentary environment. RSE/Al was significantly correlated with Fe/Al and Mn/Al, which indicated that RSE entered sediments mainly by combining with Fe and Mn oxides after removing terrigenous debris inputs, and also indicated the oxidized sedimentary environment. The results were inconsistent with the results of seasonal hypoxia reflected by the historical data of dissolved oxygen in this region. It may be related to the absence of RSE enrichment signals in the sediments during seasonal hypoxia in summer after the recovery of dissolved oxygen levels in autumn and winter. Although RSE can not effectively indicate the seasonal hypoxic environment in the East China Sea, the increase of RSE enrichment in Zb7 after 1978 and the decrease after 2009 reflected to some extent the trend of seasonal hypoxia aggravating in the region since 1978 and easing after 2009. |
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| Keywords: | redox sensitive elements sedimentary environment marine sediments seasonal low-oxygen East China Sea |
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