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Titolo:
Modeling approach of nitrogen and phosphorus exchanges at the sediment-water interface of an intensive fishpond system
Autore:
Lefebvre, S; Bacher, C; Meuret, A; Hussenot, J;
Indirizzi:
IFREMER, CNRS, Ctr Rech Ecol Marine & Aquaculture, F-17137 Lhoumeau, France IFREMER Lhoumeau France F-17137 & Aquaculture, F-17137 Lhoumeau, France
Titolo Testata:
AQUACULTURE
fascicolo: 3-4, volume: 195, anno: 2001,
pagine: 279 - 297
SICI:
0044-8486(20010416)195:3-4<279:MAONAP>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
COASTAL MARINE-SEDIMENTS; NUTRIENT FLUXES; CHEMICAL FLUXES; ORGANIC-MATTER; SEA SEDIMENTS; MASS BALANCES; CAGE FARM; PONDS; BAY; REMINERALIZATION;
Keywords:
aquaculture; pond; ammonia; phosphate; diffusive fluxes; sediment; model; fish;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Lefebvre, S Fac Sci & Tech, ISOMER, Biol Marine Lab, 2 Rue Houssiniere, F-44322 Nantes3, France Fac Sci & Tech 2 Rue Houssiniere Nantes France 3 tes3, France
Citazione:
S. Lefebvre et al., "Modeling approach of nitrogen and phosphorus exchanges at the sediment-water interface of an intensive fishpond system", AQUACULTURE, 195(3-4), 2001, pp. 279-297

Abstract

The sediment-water interface in aquaculture ponds is both a sink and a source of various substances that are potentially toxic for cultured species. The sediment to water nitrogen and phosphorus exchanges were studied at thesediment-water interface in an intensive earthpond fish-farm on the FrenchAtlantic coast. This was to define the contribution of diffusive fluxes tothe total dissolved nitrogen and phosphorus produced during the 1997-1998 rearing period. Fluxes of particulate organic nitrogen (PON) and particulate phosphorus (PP) were modeled and validated using a set of observations. Diffusive fluxes were modeled using an empirical function of temperature based on in situ sediment porewarer concentration profiles. An average of 15% of PON and 10% of PP, produced by fish food waste and fish faeces were sedimented in fishponds. Ammonia and phosphate diffusive fluxes (mu mol m(-2) h(-1)) were expressed as a function of temperature (T). J(modNH4)(-) = (0.144T + 3.49) X 10(-6)exp(0.11T + 16.81)J(modPO4)(3-) = (0.086T + 1.8) X 10(-6)exp(0.09T + 15.76)PON and PP stocks in the sediment decreased during the summer and increased during the winter. However, sedimentation and mineralization-diffusion processes were approximately balancedover the 2-year period. Ammonia and phosphate diffusive fluxes accounted for only 1-4% and 4-15%, respectively, of the total dissolved nitrogen and phosphorus components produced during the rearing period. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:59:49