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Effets de l'assèchement des bassins ostréicoles sur le cycle biogéochimique de nutriments azotés: ammonification préférentielle ArchiMer
Gouleau, Dominique; Feuillet-girard, Michelle; Germaneau, James; Robert, Serge.
Oyster ponds behave as organic matter accumulators, unlike wetlands which export a large part of their natural productivity towards the ocean as well as inorganic nitrogen towards the atmosphere through denitrification. Thus, to prevent eutrophication temporary drying-out is necessary, the physical effects of which are weIl known but who se biogeochemical processes are still poorly documented. The aim of the present study was to perform a drying -out operation in an oyster pond, and to describe the modifications which occurred within the nitrogen cycle: i.e. mineralization processes within the top 5 cm of the sediment; changes in nutrient pore-water concentrations; and fluxes through the water/sediment interface. Prior to the operation, ammonia was the...
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Ano: 1996 URL: http://archimer.ifremer.fr/doc/00017/12789/9730.pdf
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Etude morpho-sédimentaire de la vasière intertidale de Monportail-Brouage (Bassin de Marennes-Oleron) Atlas des Facies ArchiMer
Germaneau, James; Robert, Serge.
L'ouvrage que Verger (1968) a consacré au littoral français en général et au Bassin de Marennes-Oléron en particulier est certainement le plus important document dont nous disposons dans le domaine morpho-sédimentaire. Dans cette étude, l'auteur assimile le littoral charentais aux Wadden de Hollande : cette comparaison est cependant discutable, suivant les arguments développés ci-après qui montrent les principales différences entre vasières littorales charentaises et waddens hollandais.
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Ano: 1995 URL: http://archimer.ifremer.fr/doc/00082/19306/16900.pdf
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