Data/hora: 13/06/2024 10:32:47

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

info:eu-repo/semantics/openAccess

restricted use