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首页> 外文期刊>Estuarine Coastal and Shelf Science >Phosphorus mobility under short-term anoxic conditions in two shallow eutrophic coastal systems (Curonian and Sacca di Goro lagoons)
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Phosphorus mobility under short-term anoxic conditions in two shallow eutrophic coastal systems (Curonian and Sacca di Goro lagoons)

机译：短期缺氧条件下两个浅水富营养化沿海系统（库鲁尼亚和萨卡迪戈罗泻湖）的磷迁移率

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摘要

The effects of short-term anoxia on phosphorus mobility were investigated in estuarine sediments collected from two eutrophic European lagoons. Study areas differ with regard to climate and salinity: the boreal Curonian Lagoon (Lithuania) is oligohaline while the Mediterranean Sacca di Goro (Italy) is mesohaline. In each lagoon two sites were chosen representing areas impacted by river plume discharge and areas impacted by high organic matter deposition. Benthic fluxes of dissolved oxygen, inorganic phosphorus (DIP), iron (Fe2+) and manganese (Mn2+) were measured by dark intact core incubations in oxic and anoxic conditions. The latter were induced by incubation prolonged by up to 40 h depending on oxygen consumption rates. Solid phase P pools and pore water profiles of DIP, Fe2+, Mn2+ and sulfides were also measured before and after the induction of anoxia. Although incubation temperature and organic matter content were similar in plume and organic impacted areas of the two estuaries, higher benthic oxygen consumption rates were observed in Sacca di Goro, suggesting higher reactivity of the organic pool. Short-term anoxia had a significant effect on benthic fluxes of DIP (sulfide and Fe2+) only at the organic-rich and saline site of Sacca di Goro while internal buffers prevented inorganic P regeneration at the remaining sites. However, the analysis of pore water and solid phase pools revealed large variations during the transition and provided insights on the mechanisms controlling P dynamics. Both stations influenced by river plume deposition had high total inorganic P content (but most of it was refractory) and high reactive Mn pools, continuously regenerated by ventilation and irrigation of sediments by macrofauna. In these sites, oxygen depletion resulted in large accumulation of reduced Mn in the pore water but high fluxes of Mn2+ were also measured in the oxic part of the incubation suggesting the relevance of this respiration process. Thus Mn reduction preserved oxidized Fe pool and ultimately prevent P mobilization. Our results suggest that fluxes of DIP across the sediment water interface are controlled by an array of different and site-specific mechanisms. These biogeochemical buffers are effective and contrast massive P release to the water column in highly productive systems as coastal lagoons, where episodes of transient oxygen shortage are frequent. (c) 2015 Elsevier Ltd. All rights reserved.
机译：在从两个富营养化欧洲泻湖收集的河口沉积物中，研究了短期缺氧对磷迁移率的影响。研究区域在气候和盐度方面有所不同：北部库尔斯沙嘴泻湖（立陶宛）为低盐，而地中海萨卡迪戈罗（意大利）为中卤。在每个泻湖中，选择了两个站点，分别代表受河羽排放影响的区域和受高有机质沉积影响的区域。通过在有氧和无氧条件下进行完好无损的核心孵育，测量了溶解氧，无机磷（DIP），铁（Fe2 +）和锰（Mn2 +）的底通量。后者是通过孵育延长长达40 h来诱导的，具体取决于耗氧率。在诱导缺氧之前和之后，还测量了DIP，Fe2 +，Mn2 +和硫化物的固相P池和孔隙水剖面。尽管在两个河口的羽流和受有机物影响的区域中，孵化温度和有机物含量相似，但在萨卡迪戈罗观察到底栖氧气消耗率较高，表明有机池的反应性较高。短期缺氧仅对Sacca di Goro富含有机物和盐分的地点的DIP底栖通量（硫化物和Fe2 +）有显着影响，而内部缓冲液可防止其余地点的无机P再生。然而，对孔隙水和固相池的分析揭示了过渡过程中的巨大变化，并为控制P动力学的机理提供了见识。受河羽沉积影响的两个站都具有较高的总无机P含量（但大部分是难熔的）和高反应性Mn池，它们通过大型动物区系的通风和沉积物灌溉而连续再生。在这些位置，耗氧导致孔隙水中大量还原的Mn积累，但在培养的有氧部分也检测到高通量的Mn2 +，表明此呼吸过程具有相关性。因此，Mn还原保留了氧化的Fe并最终阻止了P的迁移。我们的结果表明，穿过沉积物水界面的DIP通量受一系列不同的，针对特定地点的机制控制。这些生物地球化学缓冲剂是有效的，并且可以在高产系统（如沿海泻湖）中大量磷释放到水柱中，在沿海泻湖中经常发生短暂的氧气短缺事件。 （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|134-146|共13页
  • 作者

    Zilius M.; Giordani G.; Petkuviene J.; Lubiene I.; Ruginis T.; Bartoli M.;

  • 作者单位

    Ctr Klaipeda Univ, Marine Sci & Technol, Coastal Res & Planning Inst, LT-92294 Klaipeda, Lithuania;

    Univ Parma, Dept Life Sci, I-43124 Parma, Italy;

    Ctr Klaipeda Univ, Marine Sci & Technol, Coastal Res & Planning Inst, LT-92294 Klaipeda, Lithuania;

    Ctr Klaipeda Univ, Marine Sci & Technol, Coastal Res & Planning Inst, LT-92294 Klaipeda, Lithuania;

    Ctr Klaipeda Univ, Marine Sci & Technol, Coastal Res & Planning Inst, LT-92294 Klaipeda, Lithuania;

    Ctr Klaipeda Univ, Marine Sci & Technol, Coastal Res & Planning Inst, LT-92294 Klaipeda, Lithuania|Univ Parma, Dept Life Sci, I-43124 Parma, Italy;

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

    Phosphorus; Sediments; Anoxia; Buffer capacity; Iron; Manganese;

    机译：磷;沉积物;缺氧;缓冲能力;铁;锰;

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