Est un extrait ou un tiré à part de
| Titre : | Axial and radial water flow in the trunks of oak trees : a quantitative and qualitative analysis. | | Type de document : | texte imprimé | | Auteurs : | André Granier, Auteur ; T. Anfodillo, Auteur ; M. Sabatti, Auteur ; Hervé Cochard, Auteur ; Erwin Dreyer, Auteur ; M. Tomasi, Auteur ; R. Valentini, Auteur ; Nathalie Breda, Auteur | | Année de publication : | 1994 | | Importance : | pp. 1383-1396 | | Note générale : | Vol.14 - n°12 | | Langues : | Anglais (eng) | | Résumé : | Axial water flow in the trunks of mature oak trees (Quercus petraea (Matt.) Liebl. and Q. robur L.) was studied by four independent techniques: water absorption from a cut trunk, sap flowmeters, heat pulse velocity (HPV) and thermoimaging. Estimation of the total water flow with sap flowmeters, HPV and water absorption yielded comparable results. We concluded from dye colorations, thermograms and axial profiles of sap flow and heat pulse velocity that, in intact trunks, most of the flow occurred in the current-year ring, where early-wood vessels in the outermost ring were still functional. Nevertheless, there was significant flow in the older rings of the xylem. Total water flow through the trunk was only slightly reduced when air embolisms were artificially induced in early-wood vessels, probably because there was little change in hydraulic conductance in the root–leaf sap pathway. Embolization of the current-year vessels reactivated transport in the older rings. | | Type de document : | Tiré à part | | Permalien de la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=180793 |
Est un extrait ou un tiré à part de
Axial and radial water flow in the trunks of oak trees : a quantitative and qualitative analysis. [texte imprimé] / André Granier, Auteur ; T. Anfodillo, Auteur ; M. Sabatti, Auteur ; Hervé Cochard, Auteur ; Erwin Dreyer, Auteur ; M. Tomasi, Auteur ; R. Valentini, Auteur ; Nathalie Breda, Auteur . - 1994 . - pp. 1383-1396. Vol.14 - n°12 Langues : Anglais ( eng) | Résumé : | Axial water flow in the trunks of mature oak trees (Quercus petraea (Matt.) Liebl. and Q. robur L.) was studied by four independent techniques: water absorption from a cut trunk, sap flowmeters, heat pulse velocity (HPV) and thermoimaging. Estimation of the total water flow with sap flowmeters, HPV and water absorption yielded comparable results. We concluded from dye colorations, thermograms and axial profiles of sap flow and heat pulse velocity that, in intact trunks, most of the flow occurred in the current-year ring, where early-wood vessels in the outermost ring were still functional. Nevertheless, there was significant flow in the older rings of the xylem. Total water flow through the trunk was only slightly reduced when air embolisms were artificially induced in early-wood vessels, probably because there was little change in hydraulic conductance in the root–leaf sap pathway. Embolization of the current-year vessels reactivated transport in the older rings. | | Type de document : | Tiré à part | | Permalien de la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=180793 |
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Faire une suggestion Affiner la recherche Interroger des sources externesUne analyse des changements climatiques régionaux en France entre 1956 et 1997. Réflexions en terme de conséquences pour les écosystèmes forestiers / François Lebourgeois in Annals of forest science, Vol. 58 n° 7 (01/10/2001)
