Sediment and water nutrients and microalgae in a coastal shallow lagoon, Ria Formosa (Portugal): implications for the Water Framework Directive.
Sediment and water nutrients and microalgae in a coastal shallow lagoon, Ria Formosa (Portugal): implications for the Water Framework Directive.
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Ria Formosa（葡萄牙）沿海浅泻湖中的沉积物和水营养物以及微藻：对水框架指令的影响。
DOI：
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发表时间：
2010
影响因子：
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通讯作者：
T. Fernandes
中科院分区：
文献类型：
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作者：
A. Brito;A. Newton;P. Tett;T. Fernandes
沿海浅泻湖被认为是非常重要的系统，具有特定的生物地球化学循环和特征。沉积物-水界面的评估对于了解养分动态和评估富营养化的脆弱性至关重要，特别是在水交换受限（RRE）的地区，例如西亚福尔摩沙，这些地区具有养分积累的自然条件。 2006 年和 2007-08 年收集了水样，以检测营养物、叶绿素 a 和溶解氧。还收集了沉积物样品的孔隙水养分和微型底栖植物叶绿素 a。还测量了温度、盐度和光合有效辐射。泻湖盐度受到偶尔强降雨的影响。与之前的工作相比，可以观察到水体中氮浓度的下降，这可能表明水质有所改善。孔隙水营养盐浓度明显大于水柱中的营养盐浓度。沉积物-水交换被认为是泻湖营养动态中最重要的过程。与浮游植物相比，底栖微藻生物量也较大。它占系统总微藻叶绿素生物量的约 99%。泻湖还包含（不连续的）潮间带海草草甸，但我们没有研究这些。由于沉积物的重要性，《水框架指令》要求的标准监测计划可能无法跟踪营养条件的变化以及微藻对其的反应。
Coastal shallow lagoons are considered to be highly important systems, which have specific biogeochemical cycles and characteristics. The assessment of sediment-water interfaces is essential to understand nutrient dynamics and to evaluate the vulnerability to eutrophication, especially in regions of restricted water exchange (RRE), such as the Ria Formosa, which have natural conditions for the accumulation of nutrients. Water samples were collected during the years of 2006 and 2007-08 for nutrients, chlorophyll a and dissolved oxygen. Sediment samples were also collected for pore water nutrients and microphytobenthic chlorophyll a. Measurements of temperature, salinity and photosynthetic active radiation were also taken. The lagoon salinity is affected by occasional strong rainfall events. From comparison with previous work, a decrease in the nitrogen concentration in the water column can be observed, which may indicate an improvement of the water quality. Pore water nutrient concentrations were significantly larger than in the water column. Sediment-water exchanges are considered to be the most important processes in nutrient dynamics of the lagoon. Benthic microalgal biomass was also large compared with that of the phytoplankton. It represents about 99% of the total microalgal chlorophyll biomass of the system. The lagoon also contains (discontinuous) meadows of intertidal seagrass, but we did not study these. Due to the importance of sediments, the standard monitoring plans required by the Water Framework Directive may fail to track changes in the nutrient conditions and the microalgal responses to them.