000099419 001__ 99419
000099419 005__ 20210902121828.0
000099419 0247_ $$2doi$$a10.1093/treephys/tpaa026
000099419 0248_ $$2sideral$$a118333
000099419 037__ $$aART-2020-118333
000099419 041__ $$aeng
000099419 100__ $$aRipullone, F.
000099419 245__ $$aVariation in the access to deep soil water pools explains tree-to-tree differences in drought-triggered dieback of Mediterranean oaks
000099419 260__ $$c2020
000099419 5060_ $$aAccess copy available to the general public$$fUnrestricted
000099419 5203_ $$aIndividual differences in the access to deep soil water pools may explain the differential damage among coexisting, conspecific trees as a consequence of drought-induced dieback. We addressed this issue by comparing the responses to a severe drought of three Mediterranean oak species with different drought tolerance, Quercus pubescens L. and Quercus frainetto Ten., mainly thriving at xeric and mesic sites, respectively, and Quercus cerris L., which dominates at intermediate sites. For each species, we compared coexisting declining (D) and non-declining (ND) trees. The stable isotope composition (d2H, d18O) of xylem and soil water was used to infer a differential use of soil water sources. We also measured tree size and radial growth to quantify the long-term divergence of wood production between D and ND trees and non-structural carbohydrates (NSCs) in sapwood to evaluate if D trees presented lower NSC values. The ND trees had access to deeper soil water than D trees except in Q. frainetto, as indicated by significantly more depleted xylem water values. However, a strong d2H offset between soil and xylem water isotopes observed in peak summer could suggest that both tree types were not physiologically active under extreme drought conditions. Alternative processes causing deuterium fractionation, however, could not be ruled out. Tree height and recent (last 15-25 years) growth rates in all species studied were lower in D than in ND trees by 22 and 44%, respectively. Lastly, there was not a consistent pattern of NSC sapwood concentration; in Q. pubescens, it was higher in ND trees while in Q. frainetto, the D trees were the ones exhibiting the higher NSC concentration. We conclude that the vulnerability to drought among conspecific Mediterranean oaks depends on the differential access to deep soil water pools, which may be related to differences in rooting depth, tree size and growth rate.
000099419 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/CGL2015-69186-C2-1-R
000099419 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000099419 590__ $$a4.196$$b2020
000099419 591__ $$aFORESTRY$$b4 / 67 = 0.06$$c2020$$dQ1$$eT1
000099419 592__ $$a1.413$$b2020
000099419 593__ $$aPlant Science$$c2020$$dQ1
000099419 593__ $$aPhysiology$$c2020$$dQ1
000099419 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000099419 700__ $$0(orcid)0000-0003-2436-2922$$aCamarero, J.J.
000099419 700__ $$aColangelo, M.
000099419 700__ $$aVoltas, J.
000099419 773__ $$g40, 5 (2020), 591-604$$pTree physiol.$$tTree physiology$$x0829-318X
000099419 8564_ $$s831320$$uhttps://zaguan.unizar.es/record/99419/files/texto_completo.pdf$$yPostprint
000099419 8564_ $$s1004230$$uhttps://zaguan.unizar.es/record/99419/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000099419 909CO $$ooai:zaguan.unizar.es:99419$$particulos$$pdriver
000099419 951__ $$a2021-09-02-10:13:41
000099419 980__ $$aARTICLE