Data/hora: 03/06/2024 05:44:31

Provedor de dados: 	5	
País: 	France	
Título: 	Absorption et régénération de l'azote dans le système brassé de la Manche : productions nouvelle et régénérée	
Autores: 	Maguer, Jf; L'Helguen, S; Madec, C; Le Corre, P.	
Data: 	1998-11	
Ano: 	1998	
Palavras-chave: 	Azote; Absorption; Régénération; Productions nouvelle et régénérée; Manche; Nitrogen; Uptake; Regeneration; New and regenerated productions; English Channel.	
Resumo: 	Nitrate and ammonium uptake rates were measured in spring and summer in deep and shallow well-mixed waters of the English Channel during different cruises between 1986 and 1994. In the deep waters, nitrate uptake was relatively low during phytoplankton development and ammonium uptake represented more than 70 % of the total uptake irrespective of the season. In the shallow waters, nitrate uptake during spring phytoplankton growth was high and represented about 75 % of the total uptake. Ammonium uptake became substantial towards the end of spring and summer. The high contribution of ammonium to the nitrogenous nutrition of phytoplankton over the whole of the well-mixed waters is related to a high rate of recycling of nitrogen in the water column. Ammonium regeneration by microheterotrophs can satisfy between 62 % and the totality of the phytoplankton nitrogen requirements. The high primary production in deep well-mixed waters is not supported by allochthonous nitrogen supply but by an intense in situ regeneration of nitrogen. The situation is similar in shallow well-mixed waters, except during the spring bloom.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00325/43644/43246.pdf

DOI:10.1016/S0399-1784(99)80012-7

http://archimer.ifremer.fr/doc/00325/43644/	
Editor: 	Gauthier-villars/editions Elsevier	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 1998-11 , Vol. 21 , N. 6 , P. 861-870	
Fonte: 	Elsevier, Paris

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