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首页> 外文期刊>Estuarine Coastal and Shelf Science >A new insight into black blooms: Synergies between optical and chemical factors
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A new insight into black blooms: Synergies between optical and chemical factors

机译：黑花的新见解：光学和化学因素之间的协同作用

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摘要

Black blooms have been associated with fish-kills and the loss of benthic fauna as well as closure of potable water supplies. Their frequency and duration has increased in recent decades in rivers, inland lakes and reservoirs, and has often been associated with the decay and release of organic matter (planktonic algae, aquatic macrophytes, sediment release, etc.). However, the interactions between microbial, chemical, hydrodynamic and optical conditions necessary for black blooms are poorly understood. The present study combines field investigations and laboratory mesocosm studies to show that black blooms are caused by a combination of high CDOM (chromophoric dissolved organic matter) absorption, the formation of CDOM-Fe complexes and low backscattering. Mesocosm experiments showed that black bloom conditions occur after 4 days, with a significant increase in the concentrations of Fe2+ and Sigma S2-. Total absorption (excluding absorption due to water) at 440 nm increased by 30% over this time to 7.3 m(-1). In addition, the relative contribution of CDOM absorption to the non-water total absorption increased from 18% to 50%. Regression analyses between chemical and bio-optical data in both field and mesocosm experiments indicated that the concentrations of Fe2+ co-varied positively with CDOM absorption a(g)(440) (R-2 > 0.70), and the specific CDOM absorption (a(g)(440)/DOC). Conditions that favored the development of black blooms were elevated algal or macrophyte biomass and limited water column mixing. (C) 2016 Elsevier Ltd. All rights reserved.
机译：黑色水华与杀鱼，底栖动物的丧失以及饮用水的供应有关。近几十年来，它们在河流，内陆湖泊和水库中的发生频率和持续时间不断增加，并且经常与有机物（浮游藻类，水生植物，沉积物释放等）的腐烂和释放有关。但是，人们对黑花所必需的微生物，化学，流体动力学和光学条件之间的相互作用了解得很少。本研究结合了现场调查和实验室的介观研究，表明黑花是由高CDOM（发色溶解的有机物）吸收，CDOM-Fe络合物的形成和低反向散射共同引起的。介观实验表明，在4天后出现黑花现象，Fe2 +和Sigma S2-的浓度显着增加。在这段时间内，总吸收（不包括由于水引起的吸收）在440 nm处增加了30％，达到7.3 m（-1）。此外，CDOM吸收对非水总吸收的相对贡献从18％增加到50％。野外和中观实验中化学和生物光学数据之间的回归分析表明，Fe2 +的浓度与CDOM吸收a（g）（440）（R-2> 0.70）和特定CDOM吸收（a （g）（440）/ DOC）。有利于产生黑花的条件是藻类或大型植物生物量升高，水柱混合受限。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2016年第20期|118-125|共8页
  • 作者

    Duan Hongtao; Loiselle Steven Arthur; Li Zuochen; Shen Qiushi; Du Yingxun; Ma Ronghua;

  • 作者单位

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China;

    Univ Siena, Dipartimento Farmaco Chim Tecnol, CSGI, I-53100 Siena, Italy;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CDOM; Iron; Bio-optical; Hypoxia; Brown water;

    机译：CDOM;铁;生物光学;缺氧;棕色水;

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