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Registros recuperados: 8
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Biomass and production of two Halimeda species in the southwest new caledonian lagoon ArchiMer
Garrigue, C.
Two algal communities on unconsolidated sand, dominated by two Caulerpa populations, were studied in the southwestern New Caledonian lagoon. Biomass, growth rates and production were measured at two stations over one year. Biomass and growth rate of Halimeda were estimated monthly by counting the number of new and lost segments on tagged plants and by weighing them. Production was assessed monthly by comparing two successive measurements. The average rates measured were 0.60 s f-1 d-1 (segment frond-1 day-1 ) for Halimeda incrassata and 0. 15 s f-1 d-1 for H. discoidea. Production in terms of organic carbon amounted to 3.79 g m-2 y-1 for H. incrassata and 3.37 g m-2 y-1 for H. discoidea. The production of H. discoidea population is subject to seasonal...
Tipo: Text Palavras-chave: HALIMEDA; PRODUCTION; PHYTOBENTHOS; NEW-CALEDONIA; BIOMASS.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00102/21277/18886.pdf
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Distribution of zooplankton populations in marennes-oleron bay (france), structure and grazing impact of copepod communities ArchiMer
Sautour, B; Castel, Jerome.
Zooplankton distribution in Marennes-Oleron Bay (France) varies during the year and is essentially determined by seasonal rhythms. The whole set of zooplanktonic taxa can be divided into three groups: the first bearing oceanic affinities; the second with estuarine tendencies; and the third more intermediate. Important water flows inhibit the establishment in a specific zone of an autochthonous community (this community is reduced to such species as Acartia discaudata, Acartia grani and Euterpina acutifrons). Zooplanktonic populations reach their maximum abundances at the end of spring and during summer, particularly during spring tide in the inner neritic zone. The estimation of die grazing pressure of copepods (which are the dominant taxa) is variable...
Tipo: Text Palavras-chave: MARENNES-OLERON; ZOOPLANKTON; COPEPODS; BIOMASS; GRAZING.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00099/21055/18681.pdf
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Distribution quantitative de la macrofaune benthique des sables intertidaux du bassin d'Arcachon ArchiMer
Bachelet, G; Dauvin, Jc.
The species composition and spatial distribution of macrofaunal assemblages in intertidal sands of Arcachon Bay, on the southwestern Atlantic coast of France, were investigated through a quantitative sampling of twenty stations representative of the various sandy habitats found in the bay, excluding the exposed beaches. Sampling was done on a single occasion, during the winter of 1988. A total of 150 macrobenthic species (> 1 mm) were collected. The abundance of macrofauna ranged from 89 to 52000 ind.m-2 (with a high dominance of the gastropod Hydrobia ulvae in some sites) and the biomass ranged from 1.3 to 42.5 g.m-2 dry weight. Thirteen additional species (belonging to temporary meiofauna and small macrofauna) were also sampled in the sieving fraction...
Tipo: Text Palavras-chave: INTERTIDAL MACROZOOBENTHOS; INFAUNAL ASSEMBLAGES; BIOMASS; ARCACHON BAY; ORDINATION.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00100/21133/18753.pdf
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Does intercropping winter wheat (Triticum aestivum) with red fescue (Festuca rubra) as a cover crop improve agronomic and environmental performance? A modeling approach Inra
Shili, I.; De Tourdonnet, S.; Launay, M.; Doré, T..
The introduction of a living cover crop during a cash crop growth cycle (relay intercropping) and its maintenance after the cash crop harvest may help to preserve biodiversity, increase soil organic matter content and carbon sequestration and provide other ecosystem services, such as natural pest regulation or nutrient recycling, by increasing useful biotic interactions within the agroecosystem. We studied the impact of various approaches to manage a red fescue cover crop in a winter wheat crop in terms of light, water and nitrogen competition, using the STICS crop model adapted for intercropping. The STICS model for wheat/fescue intercropping was first evaluated on two years of experimental data obtained in the field. It gave satisfactory statistical...
Tipo: Journal Article Palavras-chave: LUMIERE COMPETITION; FACILITATION; RELAY INTERCROPPING; YIELD; BIOMASS; LIGHT; Water; Nitrogen.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011c9335a33&uri=/notices/prodinra1/2011/02/
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Effect of initial fertilisation on biomass and nutrient content of Norway spruce and Douglas-fir plantations at the same site Inra
Sicard, C.; Saint Andre, L.; Gelhaye, D.; Ranger, J..
Norway spruce (NS) and Douglas-fir (DF) are among the main species used for production forestry in France. In low-elevation mountains and under-acidic conditions, they often occupy the same ecological situations. It is therefore of paramount interest to have a good understanding of how the two species behave under similar conditions and how they react to site improvement by fertilisation. The study stands are part of an experimental stand located in the estate forest of Breuil-Chenue in the Morvan (east central part of France). Its aim is to compare the impact of change in species on ecosystem functions. Destructive sampling of 10 trees per stand, distributed over the whole spectrum of inventoried classes of circumference at breast height (c 1.30), was...
Tipo: Journal Article Palavras-chave: PEUPLEMENT FORESTIER; TENEUR EN ELEMENTS NUTRITIFS DOUGLAS FIR; NORWAY SPRUCE; BIOMASS; NUTRIENT CONTENT; FERTILITY; ALLOMETRY; NUTRIENT USE EFFICIENCY .
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20107893e259&uri=/notices/prodinra1/2010/11/
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Effects of environment and progeny on biomass estimations of five hybrid poplar families grown at three contrasting sites across Europe Inra
Dillen, S.Y.; Marron, N.; Bastien, C.; Ricciotti, L.; Salani, F.; Sabatti, M.; Pinel, M.P.C.; Pinel, A.M.; Taylor, G.; Ceulemans, R..
The quantitative and qualitative estimation of aboveground previous termbiomassnext term production is essential for short-rotation forestry. Indirect methods of previous termbiomassnext term estimation have been developed based on the establishment of regressions between previous termbiomassnext term components and tree dimensions as well as canopy architecture. The difficulty encountered with this method is to know whether, and to what degree, the obtained equations can be used under contrasting environmental conditions and for different genetic backgrounds. In the present study, allometric equations were developed linking tree dry weight (stem, branch and aboveground tree dry weight) with stem circumference, stem height and number of sylleptic branches...
Tipo: Journal Article Palavras-chave: PEUPLIER HYBRIDE; TAILLIS A COURTE ROTATION; CONDITION ENVIRONNEMENTALE; FACTEUR DU MILIEU; EFFET GENETIQUE; EQUATION ALLOMETRIQUE; MATIERE SECHE HYBRID POPLAR; SHORT ROTATION COPPICE; ENVIRONMENTAL CONDITION; GENETIC BACKGROUND; ALLOMETRIC EQUATION; DRY WEIGHT; BIOMASS.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20078f3694e5&uri=/notices/prodinra1/2008/10/
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Genomic regions involved in productivity of two specific poplar families in Europe. 2. Biomass production and its relationships with tree architecture and phenology Inra
Marron, N.; Storme, V.; Dillen, S.Y.; Bastien, C.; Ricciotti, L.; Salani, F.; Sabatti, M.; Rae, A.M.; Ceulemans, R.; Boerjan, W..
Short-rotation coppice of hybrid poplar is a promising renewable feedstock for biofuel production. Breeding for high biomass in short-rotation coppice has started only recently. Two hybrid poplar families were grown at two sites in Europe and phenotyped for a variety of biomass-related traits (1) to examine the extent of phenotypic and genetic variation in biomass production, ramification, resprouting, and phenology, (2) to search for genomic regions involved in productivity, and (3) to determine the effect of the environment on the expression of these traits. The performance of both families differed within and among sites. A pronounced heterosis was observed in most cases. Moderate to high heritability values were found. Seventeen quantitative trait loci...
Tipo: Journal Article Palavras-chave: POPLAR; BIOMASS; CROP PRODUCTION; GENETIC DIVERSITY; GENOMICS; HERITABILITY; HETEROSIS; HYBRIDS; PHENOLOGY; PHENOTYPES; PLANT BREEDING; PRODUCTIVITY; QTL; QUANTITATIVE TRAIT LOCI; RENEWABLE ENERGY; SELECTION CRITERIA; WOOD; GENETIC VARIABILITY; HERITABLE CHARACTERS; HYBRID VIGOR.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20107d842062&uri=/notices/prodinra1/2010/10/
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LAMINA: a tool for rapid quantification of leaf size and shape parameters Inra
Bylesjö, M.; Segura, V.; Soolanayakanahally, R. Y.; Rae, A. M.; Trygg, J.; Gustafsson, P.; Jansson, S.; Street, N. R..
Background :An increased understanding of leaf area development is important in a number of fields: in food and non-food crops, for example short rotation forestry as a biofuels feedstock, leaf area is intricately linked to biomass productivity; in paleontology leaf shape characteristics are used to reconstruct paleoclimate history. Such fields require measurement of large collections of leaves, with resulting conclusions being highly influenced by the accuracy of the phenotypic measurement process.Results :We have developed LAMINA (Leaf shApe deterMINAtion), a new tool for the automated analysis of images of leaves. LAMINA has been designed to provide classical indicators of leaf shape (blade dimensions) and size (area), which are typically required for...
Tipo: Journal Article Palavras-chave: TAILLE DE LA FEUILLE; FORME DE LA FEUILLE; MORPHOLOGIE VEGETALE LEAF AREA; LEAF SIZE; LEAF SHAPE; BIOMASS; IMAGE ANALYSIS; PLANT MORPHOLOGY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20104741eb72&uri=/notices/prodinra1/2011/07/
Registros recuperados: 8
Primeira ... 1 ... Última
 

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