FOREST ECOLOGY AND MANAGEMENT | 卷:424 |
Assessing inter- and intraspecific variability of xylem vulnerability to embolism in oaks | |
Article | |
Lobo, Albin1  Torres-Ruiz, Jose M.2,3  Burlett, Regis3  Lemaire, Cedric3  Parise, Camille3  Francioni, Claire3  Truffaut, Laura3  Tomaskova, Ivana4  Hansen, Jon Kehlet1  Kjaer, Erik Dahl1  Kremer, Antoine3  Delzon, Sylvain3  | |
[1] Univ Copenhagen, Dept Geosci & Nat Resource Management IGN, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark | |
[2] PIAF, INRA, UCA, F-63000 Clermont Ferrand, France | |
[3] Univ Bordeaux, INRA, BIOGECO, F-33615 Pessac, France | |
[4] Czech Univ Life Sci Prague, Fac Forestry & Wood Sci, Kamycka 129, Prague 16500 6, Suchdol, Czech Republic | |
关键词: Plant hydraulics; Xylem embolism; Drought resistance; Climate change; Oaks; | |
DOI : 10.1016/j.foreco.2018.04.031 | |
来源: Elsevier | |
【 摘 要 】
The genus Quercus comprises important species in forestry not only for their productive value but also for their ability to withstand drought. Hence an evaluation of inter- and intraspecific variation in drought tolerance is important for selecting the best adapted species and provenances for future afforestation. However, the presence of long vessels makes it difficult to assess xylem vulnerability to embolism in these species. Thanks to the development of a flow centrifuge equipped with a large rotor, we quantified (i) the between species variability of embolism resistance in four native and two exotic species of oaks in Europe and (ii) the within species variability in Quercus petraea. Embolism resistance varied significantly between species, with the pressure inducing 50% loss of hydraulic conductivity (P-50) ranging between -7.0 and -4.2 MPa. Species native to the Mediterranean region were more resistant than pan-European species. In contrast, intraspecific variability in embolism resistance in Q. petraea was low within provenances and null between provenances. A positive correlation between P-50 and vessel diameter among the six oak species indicates that the more embolism resistant species had narrower xylem vessels and a higher amount of hydraulic bridges between vessels. However, this tradeoff between hydraulic efficiency and safety was not observed between Q. petraea provenances.
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