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Báo cáo lâm nghiệp:"Water relations and hydraulic characteristics of three woody species co-occurring in the same habitat"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Water relations and hydraulic characteristics of three woody species co-occurring in the same habitat" | Ann. For. Sci. 60 2003 297-305 INRA EDP Sciences 2003 DOI 10.1051 forest 2003021 297 Original article Water relations and hydraulic characteristics of three woody species co-occurring in the same habitat Andrea NARDINIa Sebastiano SALLEOa Patrizia TRIFILÒa and Maria Assunta Lo GULLOb a Dipartimento di Biologia Università di Trieste Via L. Giorgieri 10 34127 Trieste Italy b Dipartimento di Scienze Botaniche Università di Messina Salita Sperone 31 98166 Messina S. Agata Italy Received 30 April 2002 accepted 22 July 2002 Abstract - Three woody species typically encroaching the Karstic region of Trieste Northeastern Italy i.e. Cotinus coggygria L. Prunus mahaleb L. and Fraxinus ornus L. have been measured for diurnal and seasonal time courses of leaf conductance to water vapour transpiration and water potential l as well as whole-plant shoot and root hydraulic resistance Rplant Rshoot and Rroot respectively in view of investigating the impact of plant hydraulics on water stress resistance. F. ornus suffered the highest Tl drop in July and September due to the high Rplant measured in this species. Positive significant relations were found of Rplant and dJL to Rroot in all three species studied thus suggesting that root hydraulics is a major determinant of plant hydraulics and water stress resistance. The increasing Rroot and Rplant from C. coggygria to P. mahaleb to F. ornus provided a possible explanation for the typical temporal sequence of expansion of the three species into degraded areas. hydraulic architecture water relations Cotinus coggygria Prunus mahaleb Fraxinus ornus Resumé - Relations hydriques et caractéristiques hydrauliques de trois espèces ligneuses présentes dans le même habitat. Trois espèces ligneuses typiquement en cours d extension dans la region Karstique de Trieste Italie du nord i.e. Cotinus coggygria L. Prunus mahaleb L. and Fraxinus ornus L. ont été suivies aux échelles journalières et saisonnières en termes de conductance foliaire pour la .