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Registros recuperados: 11
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A budget of carbon cycling in the Belgian coastal zone: relative roles of zooplankton, bacterioplankton and benthos in the utilization of primary production OMA
Joiris, C.R.; Billen, G.; Lancelot, MH.; Daro, M.H.; Mommaerts, J.-P.; Bertels, A.; Bossicart, M.; Nijs, J.; Hecq, J.H..
The various biological compartments of the Belgian coastal zone of the North Sea were studied since 1971. The synthesis of available data on carbon cycling includes phytoplankton biomass and activities (particulate and dissolved primary production, respiration) , zooplankton biomass and activities (grazing, respiration) and planktonic and benthic microbial heterotrophic activities. These various carbon flux estimates allow the development of an overall budget of carbon cycling. This budget shows the importance of microbial (planktonic and benthic) heterotrophs versus zooplankton in the utilization of primary production. Comparison with literature data suggests that this could be a general feature of coastal, as opposed to open sea ecosystems.
Tipo: Info:eu-repo/semantics/article
Ano: 1982 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6908
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Agriculture biologique et qualité de l'eau : une évaluation des effets de la reconception de systèmes de polyculture élevage Inra
Barataud, F.; Foissy, D.; Burel, E.; Beaudoin, N.; Garnier, J.; Billen, G..
Tipo: Conference Paper Palavras-chave:  .
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011d3bfcbb9&uri=/notices/prodinra1/2011/04/
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Agronomical and environmental performances of organic farming in the Seine watershed, France Organic Eprints
Anglade, J.; Billen, G.; Garnier, J..
This work suggests that Soil Surface Balance is a robust indicator to compare the performances of organic agriculture with those of conventional agriculture, even strictly following the rules of rational and optimised application of fertilisers. The results of long term nitrogen budget calculation brought us to seriously reconsider the relevance of the need to increase crop yields, and more broadly to reconsider cropping patterns and production systems. In terms of policy levers for mitigating nitrogen contamination of water resources, only the shift to organic farming provides a possible way to reconcile agricultural production and water quality. Further, this view points out the need for specific measures to encourage more mixed farming approach to...
Tipo: Conference paper, poster, etc. Palavras-chave: Air and water emissions; Farm nutrient management.
Ano: 2013 URL: http://orgprints.org/24519/1/24519.pdf
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Concentration and microbiological utilization of small organic molecules in the Scheldt estuary, the Belgian coastal zone of the North Sea and the English Channel OMA
Billen, G.; Joiris, C.R.; Wijnant, J.; Gillain, G..
Concentrations and utilization rates of alanine, aspartate, lysine, glucose, glycollic, acetic and lactic acids have been determined on 6 occasions at least, during a full seasonal cycle in the water column of 3 stations (Scheldt estuary, coastal North Sea and English Channel) with greatly differing biological characteristics. No significant differences in substrate concentration could be detected between the 3 stations, although the rate of utilization of all substrates differed greatly, decreasing in the order estuarine > coastal > open sea environment. This apparent paradox is explained by aid of a simple model showing that the steady state concentration of a particular substrate is independent of its rate of production (and thus of consumption)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic compounds ANE; Belgium; Belgian Coast ANE; English Channel Belgium; Zeeschelde.
Ano: 1980 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6912
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Effet de la température dans les modèles chimiques et écologiques: impact des rejets thermiques OMA
Billen, G.; Elskens, I.; Smitz, J..
Tipo: Info:eu-repo/semantics/article
Ano: 1976 URL: http://www.vliz.be/imisdocs/publications/266413.pdf
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Nitrification in the Scheldt Estuary (Belgium and the Netherlands) OMA
Billen, G..
Nitrification and repartition of nitrifying bacteria were investigated in the autoepuration zone of the Scheldt estuary. Measurements of vertical profiles of nitrate and nitrite concentrations in the interstitial water of sediments show that nitrification in sediments is very low, implying that most of the nitrate and nitrate production occurs in the water of the river itself. Nitrifying bacteria, probably of terrestrial origin, are present throughout the water along a longitudinal profile of the estuary, with a regular decrease in numbers downstream. However, nitrification occurs only in a zone of favourable oxidation-reduction conditions, which coincides with the thermodynamic stability fields of nitrate and nitrite with respect to ammonium.
Tipo: Info:eu-repo/semantics/article
Ano: 1975 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3502
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Nitrogen cycling in a hypothetical scenario of generalised organic agriculture in the Seine, Somme and Scheldt watersheds Inra
Thieu, V.; Billen, G.; Garnier, J.; Benoit, M..
Nitrogen contamination of ground and surface water in the Seine, Somme and Scheldt watersheds, as well as in the receiving coastal marine zones, results in severe ecological problems. Previous modelling results showed that the implementation of classical management measures involving improvement of wastewater purification and good agricultural practices are not sufficient to obviate these problems. A more radical scenario was therefore established, consisting of a generalised shift to organic agriculture of all agricultural areas in the three basins, with the additional constraints that livestock is fed only on local fodder production. This scenario involves an increased livestock density in the Seine and Somme and a decrease in livestock in the Scheldt...
Tipo: Journal Article Palavras-chave: SCHELDT  NITROGEN; ORGANIC AGRICULTURE; NITRATE CONTAMINATION; EUTROPHICATION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011d28249c5&uri=/notices/prodinra1/2011/04/
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Nitrogen leaching from organic agriculture and conventional crop rotations (France) Organic Eprints
Benoit, M.; Garnier, J.; Billen, G.; Mercier, B.; Azougui, A..
A great challenge to science is to elucidate how agriculture can feed the increasing world population without damaging the environment, while preserving other resources such as freshwater. In the Seine basin, characterised by intensive agriculture, most of surface and underground water is contaminated by nitrate. Conventional agriculture has regularly increased the use of industrial fertilisers since the WWII, leading to high nitrogen leaching, as shown by lysimeters or suction cup measurements. Such measurements are very scarce for other agricultural systems such as organic farming (Hansen et al. 2000; Haas et al. 2002; Mondelaers et al. 2009). The goal of our study is to investigate nitrogen leaching from organic agriculture, taking into account complete...
Tipo: Conference paper, poster, etc. Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2013 URL: http://orgprints.org/24518/1/24518.pdf
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Physico-chimie de l'estuaire: dégradation de la matière organique et processus d'oxydo-réduction dans l'estuaire de l'Escaut OMA
Billen, G.; Smitz, J.; Somville, M.; Wollast, R..
Tipo: Info:eu-repo/semantics/article
Ano: 1976 URL: http://www.vliz.be/imisdocs/publications/266415.pdf
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Reducing marine eutrophication may require a paradigmatic change ArchiMer
Desmit, X.; Thieu, V.; Billen, G.; Campuzano, F.; Duliere, V.; Garnier, J.; Lassaletta, L.; Menesguen, Alain; Neves, R.; Pinto, L.; Silvestre, M.; Sobrinho, J. L.; Lacroix, G..
Marine eutrophication in the North-East Atlantic (NEA) strongly relies on nutrient enrichment at the river outlets, which is linked to human activities and land use in the watersheds. The question is whether human society can reduce its nutrient emissions by changing land use without compromising food security. A new version of Riverstrahler model (pyNuts-Riverstrahler) was designed to estimate the point and diffuse nutrient emissions (N, P, Si) to the rivers depending on land use in the watersheds across a large domain (Western Europe agro-food systems, waste water treatment). The loads from the river model have been used as inputs to three marine ecological models (PCOMS, ECO-MARS3D, MIRO&CO) covering together a large part of the NEA from the Iberian...
Tipo: Text Palavras-chave: North-East Atlantic; Eutrophication; Model scenarios; Land-sea continuum; Land use; Pristine; Management support.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00438/55007/56426.pdf
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Vertical distribution of nitrate concentration in interstitial water of marine sediments with nitrification and denitrification OMA
Vanderborght, J.P.; Billen, G..
Vertical concentration profiles of nitrate in interstitial water of sediment in the Sluice Dock at Ostend (Belgium) commonly show a maximum in nitrate concentration at a few centimeters depth where sediments are sandy and poor in organic matter, while in muddy and organic-rich sediments, nitrate is lower in interstitial water than in the overlying water and decreases rapidly with depth. Direct measurements of the activity of autotrophic nitrifying bacteria in the sediments show nitrification in the upper few centimeters of sandy sediments but not in muddy sediments. A mathematical model is proposed to analyze quantitatively these experimental results, taking into account nitrification, denitrification, diffusion, and sedimentation. Seasonal variations of...
Tipo: Info:eu-repo/semantics/article
Ano: 1975 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3524
Registros recuperados: 11
Primeira ... 1 ... Última
 

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