A retrospective, dual-isotope approach reveals individual predispositions to winter-drought induced tree dieback in the southernmost distribution limit of Scots pine
Camarero Martínez, Jesús Julio
Carulla Montañés, David
MetadataShow full item record
Winter-drought induced forest diebacks in the low-latitude margins of species’ distribution ranges can provide new insights into the mechanisms (carbon starvation, hydraulic failure) underlying contrasting tree reactions.We analysed a winter-drought induced dieback at the Scots pine’s southern edge through a dual-isotope approach (D13C and d18O in treering cellulose).We hypothesized that a differential long-term performance, mediated by the interaction between CO2 and climate, determined the fates of individuals during dieback. Declining trees showed a stronger coupling between climate, growth and intrinsic water-use efficiency (WUEi) than nondeclining individuals that was noticeable for 25 years prior to dieback. The rising stomatal control of water losses with time in declining trees, indicated by negative D13C-d18O relationships, was likely associated with their native aptitude to grow more and take up more water (suggested by larger tracheid lumen widths) than non-declining trees and, therefore, to exhibit a greater cavitation risk. Freeze-thaw episodes occurring in winter 2001 unveiled such physiological differences by triggering dieback in those trees more vulnerable to hydraulic failure. Thus, WUEi tightly modulated growth responses to long-term warming in declining trees, indicating that co-occurring individuals were differentially predisposed to winter-drought mortality. These different performances were unconnected to the depletion of stored carbohydrates.
Is part ofPlant, Cell and Environment, 2013, vol. 36, núm. 8, p. 1435-1448
European research projects
Showing items related by title, author, creator and subject.
Growth, wood anatomy and stable isotopes show species-specific couplings in three Mexican conifers inhabiting drought-prone areas Pacheco, Arturo; Camarero Martínez, Jesús Julio; Pompa-García, Marín; Battipaglia, Giovanna; Voltas Velasco, Jordi; Carrer, Marco (Elsevier, 2019-08-22)An improved understanding of how tree species will respond to warmer conditions and longer droughts requires comparing their responses across different environmental settings and considering a multi-proxy approach. We used ...
Contrasting ecophysiological strategies related to drought: the case of a mixed stand of Scots pine (Pinus sylvestris) and a submediterranean oak (Quercus subpyrenaica) Martín Gómez, Paula; Aguilera, Mònica; Pemán García, Jesús; Gil Pelegrín, Eustaquio; Ferrio Díaz, Juan Pedro (Oxford University Press, 2017-10-13)Submediterranean forests are considered an ecotone between Mediterranean and Eurosiberian ecosystems, and are very sensitive to global change. A decline of Scots pine (Pinus sylvestris L.) and a related expansion of oak ...
Quarantining the Sahara desert: growth and water-use efficiency of Aleppo pine in the Algerian Green Barrier Choury, Zineb; Shestakova, Tatiana A.; Himrane, Hocine; Touchan, Ramzi; Kherchouche, Dalila; Camarero Martínez, Jesús Julio; Voltas Velasco, Jordi (Springer Verlag, 2017-02-01)The Algerian Green Barrier, mainly composed of native and artificial Aleppo pine forests, spreads along the pre-Saharan steppes and is threatened by anthropogenic and natural disturbances, including climate change. We ...