TAILIEUCHUNG - Báo cáo khoa học: "Vulnerability to air embolism of three European species (Quercus petraea (Matt) Liebl, Q pubescens Willd, Q robur L)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Vulnerability to air embolism of three European species (Quercus petraea (Matt) Liebl, Q pubescens Willd, Q robur L). | Ann Sci For 1992 49 225-233 Elsevier INRA 225 Original article Vulnerability to air embolism of three European oak species Quercus petraea Matt Liebl Q pubescens Wi I Id Q robur L H Cochard N Bréda A Granier G Aussenac Laboratoire d Ecophysiologie Forestiere Station de Sylviculture et Production INRA Centre de Nancy F-54280 Champenoux France Received 14 October 1991 accepted 14 January 1992 Summary The vulnerability to water-stress induced cavitation and the petiole leaf specific conductivity LSC have been studied on excised branches of Quercus petraea Q pubescens Q robur and Q rubra. Seasonal evolution of xylem embolism in the petioles and twigs of mature o petraea has been followed together with increasing soil water deficit. Field experiments showed that Q pe-traea suffered from embolism damage in both petioles and twigs after heavy drought. Large differences in terms of vulnerability to cavitation and LSC have been found between species. Q pubes-cens presented the highest LSC and the lowest vulnerability together with Q petraea. Q robur was found to be more vulnerable than Q petraea although with comparable LSC. o rubra was the most vulnerable species and exhibited the lowest LSC. It was concluded that these species could be classified according to how their hydraulic mechanism is conceived to resist cavitation events o pubes-cens was the most resistant followed in order by Q petraea Q robur and Q rubra. Results are discussed in terms of plant segmentation and drought resistance. Quercus spp oaks I xylem cavitation hydraulic architecture hydraulic conductivity I drought resistance Resume Vulnérabilité à I embolie de trois espèces de chênes européens Quercus petraea Matt Liebl Q pubescens Willd o robur L . La vulnérabllité à la cavitation induite par stress hy-drique et la conductivité specifique foliaire LSC ont été étudiées sur des branches excisées de Qpetraea Q pubescens Q robur etQ rubra ưévolution saisonnière de I embolie xylémienne des petioles et des .

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