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首页> 外文期刊>Estuarine Coastal and Shelf Science >Estuarine circulation-driven entrainment of oceanic nutrients fuels coastal phytoplankton in an open coastal system in Japan
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Estuarine circulation-driven entrainment of oceanic nutrients fuels coastal phytoplankton in an open coastal system in Japan

机译：在一个开放的沿海系统中，河口循环驱动的海洋营养物夹带为沿海浮游植物提供燃料

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We investigated interactions among seasonal fluctuations in phytoplankton biomass, riverine nutrient flux, and the fluxes of nutrients entrained by estuarine circulation in Tango Bay, Japan, to determine the influence of freshwater inflows to an open bay on coastal phytoplankton productivity. The riverine nutrient flux was strongly regulated by river discharge. Estuarine circulation was driven by river discharge, with high fluxes of nutrients (mean nitrate + nitrite flux: 5.3 +/- 3.5 Mg [mega grams]-N day(-1)) between winter and early spring, enhanced by nutrient supply to the surface water via vertical mixing. In contrast, low-nutrient seawater was delivered to the bay between late spring and summer (1.0 0.8 Mg N, day(-1)). Seasonal fluctuations in phytoplanlcton biomass were affected by the entrained fluxes of oceanic nutrients and variation in the euphotic zone depth, and to a lesser degree by the riverine nutrient flux. Bioassays and stoichiometric analyses indicated that phytoplankton growth was limited by nitrogen and/or phosphorus. Both the entrainment of oceanic nutrients and the euphotic zone depth affected the duration and magnitude of blooms. Our findings show that, unlike semi-enclosed bays, seasonal variations in coastal phytoplankton in an open coastal system are primarily fueled by the entrainment of oceanic nutrients and are influenced by both freshwater inflow and coastal conditions (e.g. vertical mixing and wind events). (C) 2016 Elsevier Ltd. All rights reserved.
机译：我们调查了日本探戈湾浮游植物生物量，河流养分通量和河口环流夹带的养分通量的季节性波动之间的相互作用，以确定淡水流入开阔海湾对沿海浮游植物生产力的影响。河水的养分通量受河水流量的强烈调节。河水的流动是由河水排放驱动的，冬季和初春之间有大量的养分通量（平均硝酸盐+亚硝酸盐通量：5.3 +/- 3.5 Mg [Mg] -N day（-1）），并通过向河床提供养分来增强通过垂直混合将地表水。相反，在春季末和夏季之间，低营养海水被输送到海湾（1.0 0.8 Mg N，第（-1）天）。浮游植物生物量的季节性波动受夹带的海洋养分通量和富营养区深度变化的影响，而河流养分通量的影响较小。生物测定和化学计量分析表明，浮游植物的生长受到氮和/或磷的限制。海洋养分的夹带和富营养区的深度都影响水华的持续时间和强度。我们的发现表明，与半封闭海湾不同，开放沿海系统中沿海浮游植物的季节性变化主要是由海洋营养物的夹带推动的，并且受到淡水流入和沿海条件（例如垂直混合和风事件）的影响。 （C）2016 Elsevier Ltd.保留所有权利。

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