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首页> 外文期刊>Marine pollution bulletin >The influence of environmental variability on silicate exchange rates between sediment and water in a shallow-water coastal ecosystem, the Seto Inland Sea, Japan
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The influence of environmental variability on silicate exchange rates between sediment and water in a shallow-water coastal ecosystem, the Seto Inland Sea, Japan

机译：环境变异性对日本濑户内海浅海沿海生态系统中沉积物与水之间硅酸盐交换速率的影响

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摘要

Silicate regeneration was determined in a shallow-water coastal ecosystem (Shido Bay, the Seto Inland Sea, Japan) during 1999-2000. The present study was carried out directly by core incubation and by determining gradients of dissolved silicate (DSi) in the pore water. Incubated fluxes ranged from 25.5 to 132.6 mg Si m~(-2)d~(-1), and were 16―21.6 times greater than diffusive fluxes (5.4―43.3 mg Si m~(-2)d~(-1)). The disparity between fluxes measured by core incubation and modeling pore water indicated that other physical, chemical or biological processes, in addition to diffusion of DSi from below, contribute to DSi fluxes measured during the incubation of undisturbed cores. A regression analysis revealed that water temperature and salinity explained 24% and 23%, respectively, of season to season variability in incubated fluxes. Microphytobenthos was responsible for 37% of the variability in measured rate of DSi fluxes, with greatly reducing DSi release rates due to their own DSi demand. Moreover, the inverse relationship between the DSi fluxes and biogenic silica (Bio-Si) concentrations in the surface sediment, suggested that about 41% of the variability in the DSi fluxes were explained by Bio-Si concentrations in the surface sediment. As a result, Shido Bay showed silicate regeneration of incubated cores to be a consequence of Bio-Si dissolution depending on microphytobenthos, temperature and salinity, while diffusive fluxes appeared to be limited by DSi in the pore water. An annual average of DSi flux (68.7 +- 32.9 mgSim~(-2) d~(-1)) from the sediments to the water column corresponds to 38% of DSi, required for primary production by phytoplankton in Shido Bay.
机译：在1999年至2000年期间，在浅水沿海生态系统（日本濑户内海Shido湾）中确定了硅酸盐的再生。本研究是通过岩心温育和确定孔隙水中溶解硅酸盐（DSi）的梯度直接进行的。孵育通量范围为25.5至132.6 mg Si m〜（-2）d〜（-1），是扩散通量（5.4〜43.3 mg Si m〜（-2）d〜（-1）的16〜21.6倍）。通过岩心温育和模拟孔隙水测得的通量之间的差异表明，除了DSi从下方扩散外，其他物理，化学或生物过程也有助于在未扰动岩心温育期间测得的DSi通量。回归分析显示，水温和盐度分别解释了培养通量的季节变化与季节变化之间的关系，分别为24％和23％。微小底栖生物占DSi通量测量速率变化的37％，由于其自​​身的DSi需求，大大降低了DSi释放速率。而且，DSi通量与表层沉积物中生物硅（Bio-Si）浓度之间存在反比关系，这表明DSi通量中约41％的变异性由表层沉积物中Bio-Si浓度解释。结果，Shido湾显示出孵化后的岩心的硅酸盐再生是生物硅溶解的结果，取决于微底栖动物，温度和盐度，而扩散通量似乎受到孔隙水中DSi的限制。从沉积物到水柱的DSi年通量（68.7±32.9 mgSim〜（-2）d〜（-1））的年平均值对应于Shido湾浮游植物初级生产所需的DSi的38％。

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