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首页> 外文期刊>Environmental Science & Technology >Oxygen Consumption and Organic Matter Remineralization in Two Subtropical, Eutrophic Coastal Embayments
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Oxygen Consumption and Organic Matter Remineralization in Two Subtropical, Eutrophic Coastal Embayments

机译：两种亚热带富营养质沿海堤岸的耗氧量和有机质再矿化

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There is a strong need to understand sources of organic matter in coastal lagoons because these systems often have long water residence times, are susceptible to eutrophication, and display symptoms such as low-oxygen conditions. We found that integrated dissolved oxygen (DO) consumption in the water column accounted for 67-73% of total DO consumption in two eutrophic coastal lagoons (Baffin Bay and Oso Bay) in the northwestern Gulf of Mexico. The delta C-13 of particulate organic carbon (delta C-13(POC)) showed temporal variations that corresponded with hydrological condition changes in Baffin Bay but fewer temporal changes in Oso Bay, whereas the lower delta N-15(PON) values in Baffin Bay indicated more agricultural influence than in Oso Bay, where urban sewage influences dominated. Based on closed-system incubation experiments, water-column respiration in Baffin Bay was driven by the respiration of a combination of phytoplankton, carbon from near-shore and benthic macrophytes, and other allochthonous organic carbon sources depending on hydrological conditions. However, respiration of algal carbon dominated DO consumption in Baffin Bay sediments. In comparison, Oso Bay water-column respiration was largely attributed to the degradation of phytoplankton, the growth of which was sustained by nutrient discharge from wastewater treatment plants in the watershed. In contrast to the water column, seagrass and saltmarsh carbon appeared to be the primary organic carbon source that drove DO consumption in Oso Bay sediments. These observations highlight the complexity of organic carbon sources that contribute to DO consumption in estuaries affected by human activities, especially in systems with long water residence times that can retain both organic matter and nutrients for extended periods of time.
机译：迫切需要了解沿海泻湖中的有机物来源，因为这些系统通常具有较长的水停留时间，易发生富营养化，并表现出诸如低氧条件的症状。我们发现，在墨西哥西北部两个富营养化的沿海泻湖（巴芬湾和奥索湾）中，水柱中的综合溶解氧（DO）消耗量占溶解氧总消耗量的67-73％。颗粒有机碳的δC-13（δC-13（POC））表现出与巴芬湾水文条件变化相对应的时间变化，但与奥索湾的时间变化相对应，而δ13的较低N-15（PON）值巴芬湾显示出比奥索湾更大的农业影响力，在奥索湾，城市污水影响占主导地位。根据封闭系统的孵化实验，巴芬湾的水柱呼吸作用是由浮游植物，近岸和底栖植物的碳以及其他异源有机碳源（取决于水文条件）的呼吸作用共同驱动的。然而，藻类碳的呼吸作用是巴芬湾沉积物中溶解氧消耗的主要来源。相比之下，奥索湾水柱的呼吸作用主要归因于浮游植物的退化，浮游植物的生长由流域废水处理厂的养分排出而得以维持。与水柱相比，海草和盐沼碳似乎是推动奥索湾沉积物中溶解氧消耗的主要有机碳源。这些观察结果突显了有机碳源的复杂性，这些有机碳源会在受人类活动影响的河口中消耗溶解氧，特别是在水停留时间长的系统中，可以长时间保留有机物和养分。

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  • 来源
    《Environmental Science & Technology》 |2018年第22期|13004-13014|共11页
  • 作者

    Wang Hongjie; Hu Xinping; Wetz Michael S.; Hayes Kenneth C.;

  • 作者单位

    Texas A&M Univ, Dept Life Sci, Corpus Christi, TX 78412 USA;

    Texas A&M Univ, Dept Phys & Environm Sci, Corpus Christi, TX 78412 USA;

  • 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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