Data/hora: 09/06/2024 11:49:00

Provedor de dados: 	5	
País: 	France	
Título: 	Minéralisation de la matière organique et échanges ioniques à l'interface eau-sédiment de l'étang de Berre, Méditerranée	
Autores: 	Delmas, Daniel.	
Data: 	1980	
Ano: 	1980	
Palavras-chave: 	Interface eau-sédiment; Matière organique; Eau interstitielle; Minèralisation; Milieu saumâtre; Water-sediment interface; Organic matter; Lnterstitial water; Mineralization; Brackish basin.	
Resumo: 	The étang de Berre, near Marseilles (France), is an inland brackish basin with a high primary rate of production. In 1966, the diversion of the Durance River introduced important hydrological changes. A study of organic matter mineralization and ionie exchanges at the water-sediment interface has made it possible to distinguish two areas, according to the composition of organic matter, mineralization mechanism and ionie transfers. In the North, the high rate of mineral sedimentation leads to a low content of organic matter in the sediment. This organic matter of detrital origin is little affected by mineralization; there is, however, high production of ammonium nitrogen, which is released to overlying waters. Nitrates and nitrites undergo denitrification processes in interstitial waters. The negative oxidation-reduction potential (Eh) of the sediment facilita tes the reduction of sulphates to H2S, th us leading to the release of phosphates and their diffusion to overlying waters. In the South, sediments are rich in organic matter, which is highly mineralized, mainly at the water-sediment interface. The degradation of this matter leads to a high production of ammonium nitrogen, which diffuses to overlying waters and is stocked under the halocline. Sulphates of marine origin are not reduced. Organic and mineral sedimentation accounts for the high concentrations of phosphates in interstitial waters. The remanent salinity observed in the interstitial waters of deeper samples would appear to be a relie of the earlier hydrological system of the basin.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00122/23317/21142.pdf	
Editor: 	Gauthier-Villars	
Relação: 	http://archimer.ifremer.fr/doc/00122/23317/	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-Villars), 1980 , Vol. 3 , N. 3 , P. 347-356	
Fonte: 	Gauthier-Villars