tailieunhanh - Báo cáo lâm nghiệp: "Relationships between hydraulic traits and habitat preference for six Acer species occurring in the French Alps"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Relationships between hydraulic traits and habitat preference for six Acer species occurring in the French Alps. | Ann. For. Sci. 61 2004 81-86 INRA EDP Sciences 2004 DOI forest 2003087 81 Original article Relationships between hydraulic traits and habitat preference for six Acer species occurring in the French Alps Jérôme TISSIERa Luc LAMBSb Jean-Paul PELTIERa Gérard MARIGOa a Laboratoire d Écologie Alpine Université Joseph Fourier BP 53 38041 Grenoble Cedex 9 France b Centre d Écologie des Systèmes Aquatiques Continentaux 29 rue Marvig 31055 Toulouse Cedex 04 France Received 23 October 2002 accepted 11 April 2003 Abstract - Xylem hydraulic properties and vulnerability to cavitation were studied in six Acer species which occur in the French Alps along a soil moisture gradient from the moist valleys to the drier mountain stands. The results obtained suggest that a relationship existed between hydraulic properties and the species moisture preference. Maples located in dry zones A. opalus A. monspessulanum proved more resistant to drought-induced cavitation than species that occurred in an irrigated area A. negundo A. pseudoplatanus A. platanoides A. campestre . The most vulnerable species to cavitation A. negundo A. pseudoplatanus A. platanoides A. campestre showed the highest hydraulic conductances whereas more cavitation-resistant species A. opalus A. monspessulanum had the lowest conductances. This suggests a tradeoff between hydraulic efficiency and cavitation vulnerability. The possible ecological significances of these data are discussed in relation to the distribution of Acer species in their natural habitats. drought tolerance hydraulic conductance xylem cavitation Acer species Résumé - Étude des relations entre les caractéristiques hydrauliques et les exigences écologiques de six espèces d Acer dans les Alpes francaises. Les propriétés hydrauliques du xylème et la vulnérabilité à la cavitation ont été étudiées chez six espèces d Acer qui se distribuent dans les Alpes franfaises selon un gradient d exigence hydrique depuis les vallées humides jusqu à des zones .