Assessment of old eutrophication in the sediments of Marchica Lagoon (a post-restored lagoon, Mediterranean): The role of geochemistry and granulometry of the sediments

Abderrahmane Rahhou, Mostafa Layachi, Mustapha Akodad, Najib El Ouamari, Asmae Aknaf, Ali Skalli, Hamza Loukili, Youssef Bernichi, Brahim Oudra and Mourad Baghour
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Mostafa Layachi: Regional Center of INRH-Nador (National Institute of Fisheries Research), Morocco
Mustapha Akodad: Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco
Najib El Ouamari: Regional Center of INRH-Nador (National Institute of Fisheries Research), Morocco
Asmae Aknaf: Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco
Ali Skalli: Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco
Hamza Loukili: Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco
Youssef Bernichi: GAT, Faculty of Sciences and Techniques of Tangier, University Abdelmalek Essaadi, Tétouan, Morocco
Brahim Oudra: Water, Biodiversity and Climate Change Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco
Mourad Baghour: Laboratory of Biology, Geosciences, Physics and Environment (OLMAN-LBGPE), Multidisciplinary Faculty, Nador, Morocco

Soil and Water Research, 2023, vol. 18, issue 3, 169-180

Abstract: The aim of this study is to present the seasonal variation of organic matter (OM), total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in the bottom sediments of Marchica Lagoon, a post-restorated lagoon located in the Moroccan Mediterranean, and to estimate the potential role of the geochemistry and granulometry of bottom sediments in the retention of old eutrophication. The organic index of bottom sediment was found generally higher in old-eutrophic and enclosed areas. The surface sediments show variable levels of OM, TOC, TP, and TN; high in some cases (12.3%, 6.71%, 0.70%, and 0.30% respectively). These high levels were recorded in the central part of the lagoon and in areas subjected to high anthropogenic pressure, including wastewater discharges. Our results indicated that sediments are an excellent immobilizer of organic matter (C, N, and P), although, there was no correlation between sediment grain size and organic matter content. The absence of correlation might be explained by currentology and hydrodynamics, but also by the bathymetry of the lagoon. Therefore, sediments must be implicated in any lagoon restoration strategy and the site development plan.

Keywords: grain size; nitrogen; organic index; organic matter; phosphorus (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlswr:v:18:y:2023:i:3:id:142-2022-swr

DOI: 10.17221/142/2022-SWR

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