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首页> 外文OA文献 >Annual characterization of the nutrients and trophic state in a Mediterranean coastal lagoon: The Marano and Grado Lagoon (northern Adriatic Sea)
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Annual characterization of the nutrients and trophic state in a Mediterranean coastal lagoon: The Marano and Grado Lagoon (northern Adriatic Sea)

机译：地中海沿海泻湖中的营养和营养状态的年度特征：马拉诺和格拉多泻湖（北亚得里亚海）

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A 1-year cycle of physico-chemical measurements was conducted in the Marano and Grado Lagoon (Adriatic Sea, Italy) with the aim to assess its trophic state. Some selected variables (nutrients, chlorophyll a, dissolved oxygen, temperature and salinity) were used to describe the system within the application of the Water Framework Directive (WFD) and to compare it with other Mediterranean environments. From an ecological point of view the Marano and Grado Lagoon is one of the best conserved wetlands in the whole Mediterranean area and is protected by several European environmental pieces of legislation. However, the neighbouring mainland hosts several socio-economic activities which can affect its water quality. The results obtained in this work highlighted considerable spatial and temporal variability of physico-chemical parameters. Specifically, a large amount of anthropogenic nutrients, mainly in form of nitrogen (N), was carried from inland through river discharges in the Marano basin (western sector). However, these inputs were offset by the water exchange with the adjacent open sea, which exerted a dynamic dilution effect, and induced low water residence time thus limiting nutrients enrichment and their accumulation for long time periods. The Molar Redfield ratio (DIN/SRP) was always higher than the optimum value of 16 (in some cases it was up to 2000), thus suggesting that the system is phosphorus (P) limited, as confirmed by low chlorophyll a content, rare algal blooms and good water oxygenation. Trophic state indices and threshold values (EEA method, Carlson Trophic Index, TRIX and ASSETS) were applied. A broad range of classes was found (from oligotrophic to hypertrophic depending on water bodies, method applied and period of the year), thus suggesting that an over simplification of this complex ecosystem should be avoided. Further studies will be conducted in order to define the Lagoon's ecological status sensu WFD and the adequate management implications.
机译：在马拉诺和格拉多泻湖（意大利亚得里亚海）进行了为期1年的理化测量，目的是评估其营养状态。一些选定的变量（营养素，叶绿素a，溶解氧，温度和盐度）用于描述《水框架指令》（WFD）的应用范围内的系统，并将其与其他地中海环境进行比较。从生态学的角度来看，马拉诺和格拉多泻湖是整个地中海地区保存最完好的湿地之一，并受到欧洲几项环保法规的保护。但是，邻近的大陆开展了数项社会经济活动，可能会影响其水质。在这项工作中获得的结果突出了理化参数的相当大的时空变化。特别是，大量的人为营养素，主要以氮（N）的形式，从内陆通过马拉诺盆地（西部地区）的河流排泄物带出。但是，这些投入被与邻近公海的水交换抵消了，这产生了动态的稀释作用，并导致了低的水停留时间，从而限制了养分的长期富集和积累。摩尔红场比率（DIN / SRP）始终高于最佳值16（在某些情况下达到2000），因此表明该系统受磷（P）限制，叶绿素a含量低证实了这一点，这很罕见藻华和良好的水氧合。使用营养状态指数和阈值（EEA方法，卡尔森营养指数，TRIX和资产）。发现了各种各样的类别（根据水体，应用的方法和一年中的时期从富营养性到肥大性），因此建议应避免过度简化这种复杂的生态系统。为了确定泻湖的生态状况，该研究将进行进一步的研究和适当的管理意义。

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