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首页> 外文期刊>Environmental Science & Technology >Decoupling between Water Column Oxygenation and Benthic Phosphate Dynamics in a Shallow Eutrophic Estuary
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Decoupling between Water Column Oxygenation and Benthic Phosphate Dynamics in a Shallow Eutrophic Estuary

机译:浅水富营养化河口水柱充氧与底栖磷酸盐动力学之间的解耦

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摘要

Estuaries are crucial biogeochemical filters at the land-ocean interface that are strongly impacted by anthropogenic nutrient inputs. Here, we investigate benthic nitrogen (N) and phosphorus (P) dynamics in relation to physicochemical surface sediment properties and bottom water mixing in the shallow, eutrophic Peel-Harvey Estuary. Our results show the strong dependence of sedimentary P release on Fe and S redox cycling. The estuary contains surface sediments that are strongly reducing and act as net P source, despite physical sediment mixing under an oxygenated water column. This decoupling between water column oxygenation and benthic P dynamics is of great importance to understand the evolution of nutrient dynamics in marine systems in response to increasing nutrient loadings. In addition, the findings show that the relationship between P burial efficiency and bottom water oxygenation depends on local conditions; sediment properties rather than oxygen availability may control benthic P recycling. Overall, our results illustrate the complex response of an estuary to environmental change because of interacting physical and biogeochemical processes.
机译:河口是陆地-海洋界面上至关重要的生物地球化学过滤器,受到人为养分输入的强烈影响。在这里,我们研究浅水,富营养化的皮尔-哈维河口中底栖氮(N)和磷(P)的动力学与理化表面沉积物特性和底水混合的关系。我们的结果表明,沉积物P的释放强烈依赖于Fe和S的氧化还原循环。尽管物理沉积物在含氧水柱下混合,但河口的表层沉积物仍会大量还原并作为净磷源。水柱氧合作用与底栖磷动力学之间的这种解耦对于理解海洋系统中随着养分含量增加而养分动力学的演变非常重要。此外,研究结果表明,P埋葬效率与底部水氧合之间的关系取决于当地条件。沉积物的性质而不是氧气的可用性可以控制底栖磷的再循环。总体而言,我们的结果表明,由于物理和生物地球化学过程的相互作用,河口对环境变化的复杂反应。

著录项

  • 来源
    《Environmental Science & Technology》 |2013年第7期|3114-3121|共8页
  • 作者单位

    Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore, Australia;

    Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore, Australia;

    Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore, Australia;

    Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore, Australia;

    Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore, Australia;

    Southern Cross GeoScience, Southern Cross University, P.O. Box 157, Lismore, Australia;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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