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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Wetland effects on water quality: Input-output studies of suspended particulate matter, nitrogen (N) and phosphorus (P) in Grand-Lieu, a natural plain lake (1998)
Auteurs :	Loïc Marion, Auteur ; Luc Brient, Auteur
Type de document :	Article
Dans :	Hydrobiologia (373-374 1998)
Article en page(s) :	217-235
Résumé :	The role of wetland on water quality of rivers was estimated in a natural lake, Grand-Lieu (5600 ha), discharging to the Loire estuary. Inputs of its two tributaries, budgets and retention within the lake for particulate matter (PM), nitrogen (N) and phosphorus (P) were compared during the inflow period (Oct-May), by an input-output study, in two hydrologically contrasted years, 1993-94 with high inflow (292 106 m3), and 1995-96 with low inflow (76 106 m3), Globally the loads per ha were similar for the two tributaries for the same year, with higher values at the beginning of the flows, and total inputs markedly higher in 1993-94. During this year, average loads for the main tributary were 154 kg ha-1 PM, 40 kg ha-1 total N and 1.35 kg ha-1 total P. In the two tributaries, NO3 represented 80% of total N for the two years, and PO4 65% and 44% of total P. Total inputs, total outputs and storages are highly related to annual inflow, with large differences between elements. The highest change of inputs occur for NO2, PO4 and PM, and the lowest for NH4. Storage and outputs of the lake were also much higher in 1993-94, the most important annual differences concerning P storage, and outputs of

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