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Registros recuperados: 7
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Evidence of altitudinal increase in photosynthetic capacity: gas exchange measurements at ambient and constant CO2 partial pressures Inra
Bresson, C.; Kowalski, A. S.; Kremer, A.; Delzon, S..
Les conditions microclimatiques étant très variables avec l'altitude, il est difficile de comparer les performances d'une espèce végétale à différentes altitudes, particulièrement la capacité photosynthétique. En effet, la plupart des études antérieures ont estimé le taux maximal d'assimilation à basses et hautes altitudes en maintenant la température, l'humidité de l'air et la lumière constantes mais en laissant varier la pression partielle de CO2 (P-CO2).• Afin de comparer le taux maximum d'assimilation A(max} à pressions partielles de CO2 constantes de basse altitude et variables, nous avons effectué des mesures d'échanges gazeux sur deux espèces d'arbres tempérés le long d'un gradient altitudinal de 1600 m de dénivelé dans les Pyrénées françaises.• La...
Tipo: Journal Article Palavras-chave: ADAPTATION; ACCLIMATATION; GRADIENT ALTITUDINAL; PRESSION PARTIELLE; CAPACITÉ PHOTOSYNTHETIQUE; ÉCHANGE GAZEUX; ARBRE TEMPÉRÉ ADAPTATION; ALTITUDINAL GRADIENT; ACCLIMATION; PARTIAL PRESSURE; PHOTOSYNTHETIC CAPACITY.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009efad6bbe&uri=/notices/prodinra1/2009/11/
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Flux de CO2 et H2O à deux niveaux d'une canopée de pin maritime Inra
Jarosz, N.; Bonnefond, J.M.; Irvine, M.; Delzon, S.; Sartore, M.; Loustau, D..
Tipo: Meeting Paper Palavras-chave: COVARIANCE; MESURE DE FLUX; VEGETATION DU SOUS-BOIS.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0600036147111456&uri=/notices/prodinra1/2011/05/
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Global convergence in the vulnerability of forests to drought Naturalis
Choat, B.; Jansen, S.; Brodribb, T.J.; Cochard, H.; Delzon, S.; Bhaskar, R.; Bucci, S.J.; Feild, T.S.; Gleason, S.M.; Hacke, U.G.; Jacobsen, A.L.; Lens, F.; Maherali, H.; Martínez-Vilalta, J.; Mayr, S.; Mencuccini, M.; Mitchell, P.J.; Nardini, A.; Pittermann, J.; Pratt, R.B.; Sperry, J.S.; Westoby, M.; Wright, I.J.; Zanne, A.E..
Shifts in rainfall patterns and increasing temperatures associated with climate change are likely to cause widespread forest decline in regions where droughts are predicted to increase in duration and severity. One primary cause of productivity loss and plant mortality during drought is hydraulic failure. Drought stress creates trapped gas emboli in the water transport system, which reduces the ability of plants to supply water to leaves for photosynthetic gas exchange and can ultimately result in desiccation and mortality. At present we lack a clear picture of how thresholds to hydraulic failure vary across a broad range of species and environments, despite many individual experiments. Here we draw together published and unpublished data on the...
Tipo: Article / Letter to the editor Palavras-chave: Global convergence vulnerability forests drought climate change drought-induced forest decline 42.44; 43.47.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/453830
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Predicting the decline in daily maximum transpiration rate of two pine stands during drought based on constant minimum leaf water potential and plant hydraulic conductance Inra
Duursma, R.A.; Kolari, P.; Perämäki, M.; Nikinmaa, E.; Hari, P.; Delzon, S.; Loustau, D.; Ilviesnemi, H.; Pumpanen, J.; Mäkelä, A..
The effect of drought on forest water use is often estimated with models, but comprehensive models require many parameters, and simple models may not be sufficiently flexible. Many tree species, Pinus species in particular, have been shown to maintain a constant minimum leaf water potential above the critical threshold for xylem embolism during drought. In such cases, prediction of the relative decline in daily maximum transpiration rate with decreasing soil water content is relatively straightforward. We constructed a soil-plant water flow model assuming constant plant conductance and daily minimum leaf water potential, but variable conductance from soil to root. We tested this model against independent data from two sites: automatic shoot chamber data...
Tipo: Journal Article Palavras-chave: CANOPY STOMATAL CONDUCTANCE; VAPOR-PRESSURE DEFICIT; COARSE PODZOL PROFILES; XYLEM EMBOLISM; SAP FLOW; NIGHTTIME TRANSPIRATION; INTERSPECIFIC VARIATION; FIELD-MEASUREMENTS.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20081d6c12d7&uri=/notices/prodinra1/2009/02/
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Réponse de la phénologie des espèces forestières au changement climatique: suivi par télédétection des forêts feuillues pyrénéennes Inra
Guillot, M.; Guyon, D.; Vitasse, Y.; Hagolle, O.; Cardot, H.; Wigneron, J.P.; Delzon, S..
Tipo: Conference Paper Palavras-chave: INDICE DE VEGETATION.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008ca58266f&uri=/notices/prodinra1/2009/02/
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Response of forest phenology to elevation from SPOT/VEGETATION Inra
Guyon, D.; Guillot, M.; Hagolle, O.; Cardot, H.; Vitasse, Y.; Delzon, S.; Wigneron, J.P..
Tipo: Report section Palavras-chave:  .
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009fd5514fc&uri=/notices/prodinra1/2010/02/
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Variation of the photosynthetic capacity across a chronosequence of maritime pine correlates with needle phosphorus concentration Inra
Delzon, S.; BOSC, A.; Cantet, L.; LOUSTAU, D..
Nous avons étudié l'évolution des capacités photosynthétiques foliaires dans une chronoséquence constituée de quatre peuplements équiennes de Pin maritime âgés de 10, 32, 54 et 91 ans. Les paramètres photosynthétiques ont été estimés sur des courbes de réponse du taux d'assimilation à la concentration en CO2 (A-Ci) et à la lumière (A-Q) obtenues à partir de mesures d'échange gazeux foliaire. Dans la chronoséquence étudiée, aucune tendance n'a été mise en évidence entre les paramètres photosynthétiques (Vcmax, Jmax, a et Rd) et l'âge du peuplement. Ce résultat démontre que le déclin de productivité foliaire observée dans la chronoséquence ne peut être expliqué par les capacités photosynthétiques, mais bien par une diminution de la conductance stomatique...
Tipo: Journal Article Palavras-chave: DECLIN DE PRODUCTIVITE; VITESSE MAXIMALE DE CARBOXYLATION; TENEUR EN PHOSPHORE NPP DECLINE; MAXIMUM CARBOXYLATION RATE; NUTRIENT LIMITATION.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0500036111110056&uri=/notices/prodinra1/2009/11/
Registros recuperados: 7
Primeira ... 1 ... Última
 

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