Data/hora: 04/06/2024 09:17:35

Provedor de dados: 	5	
País: 	France	
Título: 	Atmospherically-promoted photosynthetic activity in a well-mixed ecosystem: Significance of wet deposition events of nitrogen compounds	
Autores: 	Boulart, C; Flament, Pierre; Gentilhomme, V; Deboudt, K; Migon, C; Lizon, F; Schapira, M; Lefebvre, Alain.	
Data: 	2006-09	
Ano: 	2006	
Palavras-chave: 	Strait of Dover; Nutrient cycles; River plumes; Atmospheric deposition; Coastal zone; Primary production.	
Resumo: 	Wet atmospheric deposition of dissolved N, P and Si species is studied in well-mixed coastal ecosystem to evaluate its potential to stimulate photosynthetic activities in nutrient-depleted conditions. Our results show that, during spring, seawater is greatly depleted in major nutrients: Dissolved Inorganic Nitrogen (DIN), Dissolved Inorganic Phosphorus (DIP) and Silicic acid (Si), in parallel with an increase of phytoplanktonic biomass. In spring (March-May) and summer (June-September), wet atmospheric deposition is the predominant source (&gt; 60%, relative to riverine contribution) for nitrates and ammonium inputs to this N-limited coastal ecosystem. During winter (October-February), riverine inputs of DIN predominate (&gt; 80%) and are annually the most important source of DIP (&gt; 90%). This situation allows us to calculate the possibility for a significant contribution to primary production in May 2003, from atmospheric deposition (total input for DIN approximate to 300 kg km(-2) month(-1)). Based on usual Redfield ratios and assuming that all of the atmospheric-derived N (AD-N) in rainwater is bioavailable for phytoplankton growth, we can estimate new production due to AD-N of 950 mg C m(-2) month(-1), during this period of depletion in the water column. During the same episode (May 2003), photosynthetic activity rate. considered as gross primary production, was estimated to approximately 30300 mg C m(-2) month(-1). Calculation indicates that new photosynthetic activity due to wet atmospheric inputs of nitrogen could be up to 3%. (c) 2006 Elsevier Ltd. All rights reserved.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2006/publication-2007.pdf

DOI:10.1016/j.ecss.2006.04.021	
Editor: 	Elsevier	
Relação: 	http://archimer.ifremer.fr/doc/00000/2007/	
Formato: 	application/pdf	
Fonte: 	Estuarine, Coastal and Shelf Science (0272-7714) (Elsevier), 2006-09 , Vol. 69 , N. 3-4 , P. 449-458	
Fonte: 	2006 Elsevier Ltd All rights reserved