Free access
Issue
Ann. For. Sci.
Volume 56, Number 5, 1999
Page(s) 371 - 377
DOI http://dx.doi.org/10.1051/forest:19990502
Ann. For. Sci. 56 (1999) 371-377
DOI: 10.1051/forest:19990502

Root and shoot hydraulic conductance of seven Quercus species

Andrea Nardinia and Melvin T. Tyreeb

a  Dipartimento di Biologia, Università di Trieste, Via L. Giorgieri 10, 34127 Trieste, Italy
b  USDA Forest Service, Northeastern Forest Experiment Station, 705 Spear Street, Burlington, VT 05402-0968, USA

Abstract - The root (KR) and shoot (KS) hydraulic conductances of seven different Quercus species, as well as the leaf blade hydraulic resistance (RLL), were measured in potted plants with the aim of understanding whether a relationship exists between the hydraulic architecture and the general ecological behaviour of different species of this genus. The KR values were scaled by dividing by root surface area (KRR) and by leaf surface area (KRL) and the KS values were scaled by dividing by leaf surface area (KSL). The likely drought-adapted species (Quercus suber, Q. pubescens, Q. petraea) showed lower KRL and KRR, lower KSL and higher RLL with respect to the known water-demanding species (Q. alba, Q. cerris, Q. robur, Q. rubra). The possible physiological and ecological significance of such differences are discussed. (© Inra/Elsevier, Paris.)


Résumé - Les conductivités hydrauliques de la racine et de la tige de sept espèces de Quercus. Les conductivités hydrauliques de la racine (KR) et de la tige (KS) et la résistance hydraulique des feuilles (RLL) des sept espèces de Quercus ont été mesurées avec pour objectif la compréhension de la relation qui existe entre l'écologie de l'espèce et son architecture hydraulique. Les valeurs des KR ont été divisées par les surfaces des feuilles (KRL) et des racines (KRR), celles des K S par les surfaces des feuilles (KSL). Les KRR, KRL et KSL des espèces adaptées aux environnements arides (Q. suber, Q. pubescens, Q. petraea) sont inférieures et leurs RLL supérieures par rapport aux valeurs de celles adaptées aux environnements humides (Q. alba, Q. cerris, Q. robur, Q. rubra). Cet article se propose d'illustere ces différentces au plan physiologique et écologique.


Key words: root hydraulic conductance / shoot hydraulic conductance / leaf blade resistance / Quercus / high pressure flow meter

Mots clés : conductivité hydraulique de la racine / conductivité hydraulique de la tige / Quercus / HPFM

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