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首页> 外文期刊>Estuarine Coastal and Shelf Science >Tidal variability in benthic silicic acid fluxes and microphytobenthos uptake in intertidal sediment
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Tidal variability in benthic silicic acid fluxes and microphytobenthos uptake in intertidal sediment

机译：潮间沉积物中底栖硅酸通量的潮汐变化和微底栖生物的吸收

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摘要

Silicic acid (DSi) benthic fluxes play a major role in the benthic-pelagic coupling of coastal ecosystems. They can sustain microphytobenthos (MPB) development at the water-sediment interface and support pelagic diatoms when river DSi inputs decrease. DSi benthic fluxes have been studied at the seasonal scale but little is known about their dial variations. This study measured the amplitude of such variations in an intertidal area over an entire tidal cycle by following the alteration of DSi pore water concentrations at regular intervals over the flood/ebb period. Furthermore we independently estimated the potential DSi uptake by benthic diatoms and compared it to the variations of DSi pore water concentrations and fluxes. The microphytobenthos DSi demand was estimated from primary production measurements on cells extracted from the sediment There were large changes in DSi pore water concentration and a prominent effect of tidal pumping: the DSi flushed out from the sediment at rising tide, occurs in a very short period of time, but plays a far more important role in fueling the ecosystem (800 μmol-Si m~(-2) d~(-1)), than diffusive fluxes occurring throughout the rest of the tidal cycle (2 μmol-Si m~(-2) d~(-1)). This process is not, to our knowledge, currently considered when describing the DSi cycling of intertidal sediments. Moreover, there was a large potential MPB requirement for DSi (812 μmol-Si m~(-2) d~(-1)), similar to the advective flow periodically pumped by the incoming tide, and largely exceeded benthic diffusive fluxes. However, this DSi uptake by benthic diatoms is almost undetectable given the variation of DSi concentration profiles within the sediment.
机译：硅酸（DSi）底栖通量在沿海生态系统的底栖-上层耦合中起主要作用。它们可以在水-沉积物界面处维持微底栖动物（MPB）的发育，并在河流DSi输入减少时支持浮游硅藻。已对DSi底栖通量进行了季节性研究，但对其表盘变化知之甚少。这项研究通过在洪水/退潮期间以规则间隔跟踪DSi孔隙水浓度的变化，来测量整个潮汐周期内潮间带这种变化的幅度。此外，我们独立地估计了底栖硅藻可能吸收的DSi并将其与DSi孔隙水浓度和通量的变化进行比较。微小底栖动物对DSi的需求量是根据对沉积物中提取的细胞的初步生产测量结果估算得出的。DSi孔隙水浓度变化较大，并且潮汐泵的作用显着：潮汐时DSi从沉积物中冲出，发生时间很短时间，但在为生态系统提供燃料（800μmol-Sim〜（-2）d〜（-1））方面起着比在整个潮汐周期的其余部分（2μmol-Sim 〜（-2）d〜（-1））。据我们所知，在描述潮间带沉积物的DSi循环时，目前尚未考虑此过程。而且，DSi的潜在MPB需求很大（812μmol-Sim〜（-2）d〜（-1）），类似于潮汐周期性地引入的对流，大大超过了底栖扩散通量。但是，鉴于沉积物中DSi浓度分布的变化，底栖硅藻对DSi的吸收几乎无法检测到。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第1期|p.59-66|共8页
  • 作者

    Aude Leynaert; Sorcha Ni Longphuirt; Soonmo An; Jae-Hyun Lim; Pascal Claquin; Jacques Grail; Bong Oh Kwon; Chul Hwan Koh;

  • 作者单位

    Laboratoire des Sciences de I'Environnement Mann, UMR 6539 CNRS, Institut Universitaire Europeen de la Met, Technopdle Brest-Iroise, 29280 Plouzane, France;

    Coastal Environmental System School, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea;

    Coastal Environmental System School, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea;

    Coastal Environmental System School, Pusan National University, 30 Jangjeon-dong, Geumjeong-gu, Busan 609-735, South Korea;

    Laboratoire de Biologie et Biotechnologies Marines, UMR100 MIFREMER EP2M, Universite de Caen Basse-Normandie, 14032 Caen cedex, France;

    Laboratoire des Sciences de I'Environnement Mann, UMR 6539 CNRS, Institut Universitaire Europeen de la Met, Technopdle Brest-Iroise, 29280 Plouzane, France;

    School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, South Korea;

    School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    intertidal; benthic fluxes; silicic acid; diatom; microphytobenthos; south korea;

    机译：潮间带底流硅酸硅藻微型底栖动物韩国;

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