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Registros recuperados: 5
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A Data-Base of historical total volume measurements for 6 important French forest species ; first results on volume table fitting Inra
Vallet, P; Le Moguedec, G.; Ravart, M..
Tipo: Meeting Paper Palavras-chave: FRENCH FOREST; TREE; DATA BASE.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20074b342c38&uri=/notices/prodinra1/2007/05/
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Cavitation in trees Inra
Cochard, H..
Sap is transported under tension (i.e. negative pressure) in trees, according to the tension-cohesion theory. Since water is physically instable under negative pressure, a risk of cavitation is possible. Techniques have been developed during the past two decennia to study cavitation in trees. Trees appear remarkably immune to cavitation events. Cavities form only when extreme water stresses occur or when sap freezes. Nucleation is heterogeneous in trees, presumably caused by the aspiration of air bubbles through conduit walls. Threshold xylem pressures for cavitation vary greatly between species, in concordance with the great functional and ecological diversity of trees.
Tipo: Journal Article Palavras-chave: EMBOLIE CAVITATION; EMBOLISM; TREE; TENSION; DROUGHT; XYLEM.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007d92f0c46&uri=/notices/prodinra1/2008/06/
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Distribution of parasitic fungal species richness: influence of climate versus host species diversity Inra
Vacher, C.; Vile, D.; Helion, E.; Piou, D.; Desprez Loustau, M.L..
One major challenge in parasitology and epidemiology is determining whether the richness of parasitic and infectious diseases simply tracks host diversity or is largely determined by exogenous factors, such as climate-forced variables. We addressed this issue by analysing a 30-year survey of fungal diseases in French forests. We first combined generalized linear models and stepwise analyses to select the habitat descriptors that may account for variations in parasitic fungal species richness. Our results suggest that host species diversity is not a major determinant of parasite richness. Temperature seasonality, host abundance, and the composition of host species assemblages may play a greater role. Then we used structural equation modelling to investigate...
Tipo: Journal Article Palavras-chave: BIODIVERSITY; CLIMATE; DISEASE; FUNGI; HOST PARASITE RELATIONSHIPS; TREE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20084b625a9e&uri=/notices/prodinra1/2008/09/
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Poisoning of honey bees nectar from the Karaka tree (Corynocarpus laevigata J. R. et G. Forst.) National Institute of Agronomic Research
Palmer-Jones, T.; Line, L. J. S..
Nectar from the karaka tree (Corynocarpus laeuigata ].R. et G. Forst.), which flowers in the spring and is very attractive to honey bees, is highly toxic to adult bees. The problem can be dealt with by re-siting apiaries or moving them out of range of karakas during the flowering period.
Tipo: Journal Article-postprint Palavras-chave: HONEYBEE; APIS MELLIFERA; APIDAE; HYMENOPTERA; SOCIAL INSECT; CORYNOCARPUS LAEVIGATA; TREE; NECTAR; POISON; NEW ZEALAND; ABEILLE DOMESTIQUE; INSECTE SOCIAL; ARBRE; CORYNOCARPUS LAEVIGATA; NECTAR; POISON; NOUVELLE-ZELANDE.
Ano: 1962 URL: http://hdl.handle.net/2174/350
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Root system architecture of oak seedlings in competition with grass Inra
Collet, C.; Pages, L.; Löf, M..
Tipo: Meeting Paper Palavras-chave: COMPETITION VEGETALE; PLANTULE; SYSTEME RACINAIRE; DISTRIBUTION SPATIALE; ARCHITECTURE; MODELE COMPETITION; OAK; TREE; GRASS.
Ano: 2002 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007e7d93869&uri=/notices/prodinra1/2007/09/
Registros recuperados: 5
Primeira ... 1 ... Última
 

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