| Registro completo |
| Provedor de dados: |
5
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| País: |
France
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| Título: |
Atmospherically-promoted photosynthetic activity in a well-mixed ecosystem: Significance of wet deposition events of nitrogen compounds
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| Autores: |
Boulart, C
Flament, Pierre
Gentilhomme, V
Deboudt, K
Migon, C
Lizon, F
Schapira, M
Lefebvre, Alain
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| Data: |
2006-09
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| Ano: |
2006
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| Palavras-chave: |
Strait of Dover
Nutrient cycles
River plumes
Atmospheric deposition
Coastal zone
Primary production
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| 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 (> 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 (> 80%) and are annually the most important source of DIP (> 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2006/publication-2007.pdf
DOI:10.1016/j.ecss.2006.04.021
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| Editor: |
Elsevier
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| Relação: |
http://archimer.ifremer.fr/doc/00000/2007/
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| Formato: |
application/pdf
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| Fonte: |
Estuarine, Coastal and Shelf Science (0272-7714) (Elsevier), 2006-09 , Vol. 69 , N. 3-4 , P. 449-458
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| Direitos: |
2006 Elsevier Ltd All rights reserved
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