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Hypolimnetic Oxygen Depletion in Eutrophic Lakes

机译：富营养化湖泊中的低脂氧耗竭

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摘要

The oxygen-con sum ing processes in the hypolimnia of freshwater lakes leading to deep-water anoxia are still not well understood, thereby constraining suitable management concepts. This study presents data obtained from 11 eutrophic lakes and suggests a model describing the consumption of dissolved oxygen (O_2) in the hypolimnia of eutrophic lakes as a result of only two fundamental processes: O_2 is consumed (ⅰ) by settled organic material at the sediment surface and (ⅱ) by reduced substances diffusing from the sediment. Apart from a lake's productivity, its benthic O_2 consumption depends on the O_2 concentration in the water overlying the sediment and the molecular O_2 diffusion to the sediment On the basis of observational evidence of long-term monitoring data from 11 eutrophic lakes, we found that the areal hypolimnetic mineralization rate ranging from 0.47 to 1.31 g of O_2 m~(-2) d~(-1) (average 0.90 ± 0.30) is a function of (ⅰ) a benthic flux of reduced substances (0.37 ± 0.12 g of O_2 m~(-2) d~(-1)) and (ⅱ) an O_2 consumption which linearly increases with the mean hypolimnion thickness (z_H) up to ~25 m. This model has important implications for predicting and interpreting the response of lakes and reservoirs to restoration measures.
机译：淡水湖泊低氧导致深水缺氧的耗氧过程仍未得到很好的理解，从而限制了适当的管理理念。这项研究提供了从11个富营养化湖泊中获得的数据，并提出了一个模型来描述由于两个基本过程而导致的富营养化湖泊的低氧状态下溶解氧（O_2）的消耗：O_2被沉积物中的沉降有机物质消耗（ⅰ）。表面和（ⅱ）减少的物质从沉积物中扩散出来。除了湖泊的生产力外，其底栖O_2的消耗量还取决于沉积物上覆水中的O_2浓度以及分子中的O_2扩散到沉积物中。根据对11个富营养化湖泊的长期监测数据的观察证据，我们发现区域低铁矿化速率为0.47至1.31 g O_2 m〜（-2）d〜（-1）（平均0.90±0.30）是（ⅰ）还原物质底流通量（0.37±0.12 g O_2）的函数m〜（-2）d〜（-1））和（ⅱ）的O_2消耗量随平均次纤毛厚度（z_H）线性增加而增加，直至〜25 m。该模型对于预测和解释湖泊和水库对恢复措施的响应具有重要意义。

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  • 来源
    《Environmental Science & Technology》 |2012年第18期|p.9964-9971|共8页
  • 作者

    Beat Muller; Lee D. Bryant; Andreas Matzinger; Alfred Wiiest;

  • 作者单位

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-6047 Kastanienbaum, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-6047 Kastanienbaum, Switzerland Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CH-8092 Zurich, Switzerland;

    Department Surface Water, Kompetenzzentrum Wasser Berlin gGmbH, Cicerostrasse 24, D-10709 Berlin, Germany;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-6047 Kastanienbaum, Switzerland Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, CH-8092 Zurich, Switzerland Physics of Aquatic Systems Laboratory, School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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