Data/hora: 07/06/2024 04:51:10

Provedor de dados: 	5	
País: 	France	
Título: 	Cycle de l'azote à l' interface eau-sédiment dans le Bassin d'Arcachon : rôle des bactéries dans les processus de perte en azote (nitrification-dénitrification)	
Autores: 	Riou, Stéphane Alain.	
Data: 	1999-02-05	
Ano: 	1999	
Palavras-chave: 	Nitrification; Dénitrification; Sédiment; Zostera noltii; Lagune; NPP; N6SERVE; 15N; Nitrification; Denitrification; Sediment; Zostera noltii; Marine laboon; MPN; N-serve; 15N.	
Resumo: 	Bacterial nitrification and denitrification were studied in the sediments of the Bassin d'Arcachon, a macrotidallagoon located in the Southwestern Atlantic French coast colonized by extensive Zostera noltii  meadows. Nitrifiers were enumerated by MPN method. Densities were law : from 102 to 104 bacteria per ml of sediment presenting an increase during winter. Nitrifying activities were measured by NH4+  accumulation N-serve block technique. Activities were ranged from 0 to 90 µmol m-2 h-1 and nitrification represented 120-140 mmol m-2 yr-1 for intertidal sediments. The 15N  isotope pairing technique was applied to sediment samples from the whole bay for determining the denitrification rates. Average rates were 10-20 µmol m·2 h-1 with a maximum of 75 µmol m-2 h-1. Globally, denitrification was mainly supported by nitrification during summer whereas nitrates diffusing from the water colurnn fed denitrification in winter. The relative importance of internal processes in the bacterial N-cycle ofthe bay were 3-14, 12-24 and 3-16 % of the N-nutrients inputs for nitrification, denitrification and N-fixation, respectively. The studies show that the contribution of bacterial processes in the N-cycle of the bay is law compared to external N-loadings and N-assimilation by the plants.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00443/55439/56959.pdf

http://archimer.ifremer.fr/doc/00443/55439/	
Editor: 	Université Bordeaux	
Formato: 	application/pdf	
Fonte: 	1999 Université de Bordeaux

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