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首页> 外文期刊>Estuarine Coastal and Shelf Science >Phosphorus storage and mobilization in coastal Phragmites wetlands: Influence of local-scale hydrodynamics
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Phosphorus storage and mobilization in coastal Phragmites wetlands: Influence of local-scale hydrodynamics

机译：沿海芦苇湿地的磷存储和动员：局部水动力的影响

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摘要

Coastal Phragmites wetlands are at the interface between terrestrial and aquatic ecosystems and are important for nutrient retention and regulation. They can act both as nutrient sinks and sources for phosphorus, depending on environmental conditions, sediment properties as well as antecedent nutrient loadings and sorption capacities of the sediments. The Darss-Zingst Bodden Chain is a shallow lagoon system at the German Baltic coast with a long eutrophication history which is lined almost at its entire length by Phragmites wetlands. In order to elucidate under which conditions these wetlands act as sources or sinks for phosphorus, in-situ data of chemo-physical characteristics of water and sediment samples were combined with hydrodynamic measurements and laboratory experiments. A basin zone within the wetland serves as accumulation sink for fine-grained particles rich in phosphorus, iron, manganese and organic matter. The Phragmites stems reduce the water flow and allow the accumulation of organic matter and minerals. Without turbulent mixing and downward flow the bottom water and the sediment surface lack replenishment of oxygen. The relationship between oxygen saturation in the water and soluble reactive phosphorus (SRP) concentrations showed a threshold-type behavior. Under oxygen deficiency soluble reactive phosphorus concentrations in the water were significantly higher than under aerated conditions (oxygen saturation < 10%; mean SRP = 0.22 mg/L vs. oxygen saturation > 10%; mean SRP = 0.02 mg/L). During stagnant periods with low water level, low-turbulence and thus low-oxygen conditions phosphorus from the sediments is released. But the sediments are capable of becoming sinks again once oxygen is resupplied. When vertical downward flows are dominant in the water and turbulent kinetic energy rises, oxygen saturation increases. A thin oxic sediment surface layer rich in iron and manganese is able to readsorb phosphorus quickly as kinetic sorption experiments show, but due to its redox sensitivity the immobilization is at least in part only temporary. This study demonstrated that sediments in coastal Phragmites wetlands can switch their function from sink to source of soluble reactive phosphorus on a very short time-scale, depending on local-scale hydrodynamic conditions and the state of the oxic anoxic sediment interface. (c) 2015 Elsevier Ltd. All rights reserved.
机译：沿海芦苇湿地位于陆地和水生生态系统之间的界面，对养分保持和调节至关重要。它们可以充当养分汇和磷的来源，这取决于环境条件，沉积物特性以及养分的前期养分含量和沉积物的吸附能力。 Darss-Zingst Bodden链是德国波罗的海沿岸的一个浅泻湖系统，富营养化历史悠久，芦苇湿地几乎覆盖了整个长度。为了阐明在哪些条件下这些湿地充当磷的来源或汇，将水和沉积物样品的化学物理特性的原位数据与流体动力学测量和实验室实验相结合。湿地内的盆地区域是富含磷，铁，锰和有机物的细颗粒颗粒的聚集汇。芦苇茎减少了水的流动，​​并允许有机物质和矿物质的积累。在没有湍流混合和向下流动的情况下，底部水和沉积物表面缺乏氧气的补充。水中的氧饱和度与可溶性反应性磷（SRP）浓度之间的关系显示出阈值型行为。在缺氧条件下，水中的可溶性反应性磷浓度显着高于充气条件下（氧饱和度<10％；平均SRP = 0.22 mg / L，而氧饱和度> 10％；平均SRP = 0.02 mg / L）。在低水位，低湍流和低氧条件的停滞期，会释放出沉积物中的磷。但是一旦重新补充氧气，沉积物便能够再次下沉。当垂直向下流动在水中占主导地位并且湍动能增加时，氧饱和度增加。如动力学吸附实验所示，富含铁和锰的薄的含氧沉积物表面层能够快速重新吸收磷，但是由于其对氧化还原的敏感性，固定化至少部分只是暂时的。这项研究表明，沿海芦苇湿地的沉积物可以在很短的时间内将其功能从水槽转变为可溶性反应性磷的来源，这取决于当地的水动力条件和有氧缺氧沉积物界面的状态。 （c）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2015年第5期|124-133|共10页
  • 作者

    Karstens Svenja; Buczko Uwe; Glatzel Stephan;

  • 作者单位

    Univ Rostock, Fac Agr & Environm, Landscape Ecol & Site Evaluat, D-18059 Rostock, Germany|Univ Rostock, Fac Interdisciplinary Res, Dept Maritime Syst, D-18059 Rostock, Germany;

    Univ Rostock, Fac Agr & Environm, Landscape Ecol & Site Evaluat, D-18059 Rostock, Germany|Univ Rostock, Fac Interdisciplinary Res, Dept Maritime Syst, D-18059 Rostock, Germany;

    Univ Rostock, Fac Agr & Environm, Landscape Ecol & Site Evaluat, D-18059 Rostock, Germany|Univ Rostock, Fac Interdisciplinary Res, Dept Maritime Syst, D-18059 Rostock, Germany|Univ Vienna, Dept Geog & Reg Res, Geoecol, A-1090 Vienna, Austria;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Phosphorus Coastal wetland; Phragmites australis; Turbulent kinetic energy; Germany; Southern Baltic Sea; Darss-Zingst Bodden Chain;

    机译：磷沿海湿地;芦苇;湍动能;德国;波罗的海南部;Darss-Zingst Bodden链;

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