tailieunhanh - Báo cáo khoa học: "Comparative studies of the water relations and the hydraulic characteristics in Fraxinus excelsior, Acer pseudoplatanus and A. opalus trees under soil water contrasted conditions Damien Lemoinea, Jean-Paul Peltierb and Gérard"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Comparative studies of the water relations and the hydraulic characteristics in Fraxinus excelsior, Acer pseudoplatanus and A. opalus trees under soil water contrasted conditions Damien Lemoinea, Jean-Paul Peltierb and Gérard . | Ann. For. Sci. 58 2001 723-731 INRA EDP Sciences 2001 723 Original article Comparative studies of the water relations and the hydraulic characteristics in Fraxinus excelsior Acer pseudoplatanus and A. opalus trees under soil water contrasted conditions Damien Lemoinea Jean-Paul Peltierb and Gérard Marigob aLaboratoire de Biologie Forestière Équipe Écophysiologie Cellulaire et Moléculaire Université Henri Poincaré BP 239 54506 Vandreuvre-lès-Nancy Cedex France b Écosystèmes et Changements Environnementaux Centre de Biologie Alpine Université Joseph Fourier BP 53 38041 Grenoble Cedex 9 France Received 23 March 2001 accepted 2nd July 2001 Abstract - Plant water relationships and hydraulic characteristics were measured for two species of the genus Acer that co-occur with Fraxinus excelsior but differ in their habitat preference with respect to soil moisture Acerpseudoplatanus is restricted to wet habitats whereas Acer opalus occurs on drier sites. The data obtained showed significantly lower hydraulic conductance and lower vulnerability to embolism in the drought-tolerant species Acer opalus than in the water prefering species Acer pseudoplatanus. Similar differences in hydraulic conductance and xylem vulnerability to embolism were also found under dry acclimated conditions for Fraxinus excelsior trees indicating that the hydraulic differences observed might be attributable to the contrasting soil water conditions of the sites. The possible physiological and ecological significance of such differences are discussed in relation to habitat preference and the distribution of each species. hydraulic conductance xylem embolism drought tolerance Acer pseudoplatanus Acer opalus Fraxinus excelsior Résumé - Étude comparée des relations hydriques et des caractéristiques hydrauliques chez Fraxinus excelsior Acerpseudopla-tanus et Acer opalus dans différents milieux secs et humides. Ce travail concerne l étude des relations hydriques et la détermination des caractéristiques .

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