A retrospective, dual-isotope approach reveals individual predispositions to winter-drought induced tree dieback in the southernmost distribution limit of Scots pine

Voltas Velasco, Jordi; Camarero Martínez, Jesús Julio; Carulla Montañés, David; Aguilera, Mònica; Ortiz, Araceli; Ferrio Díaz, Juan Pedro

doi:https://doi.org/10.1111/pce.12072

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Issue date

2013

Author

Voltas Velasco, Jordi

Camarero Martínez, Jesús Julio

Carulla Montañés, David

Aguilera, Mònica

Ortiz, Araceli

Ferrio Díaz, Juan Pedro

Suggested citation

Voltas Velasco, Jordi; Camarero Martínez, Jesús Julio; Carulla Montañés, David; Aguilera, Mònica; Ortiz, Araceli; Ferrio Díaz, Juan Pedro; . (2013) . A retrospective, dual-isotope approach reveals individual predispositions to winter-drought induced tree dieback in the southernmost distribution limit of Scots pine. Plant, Cell and Environment, 2013, vol. 36, núm. 8, p. 1435-1448. https://doi.org/10.1111/pce.12072.

Abstract

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.

URI

http://hdl.handle.net/10459.1/56827

DOI

https://doi.org/10.1111/pce.12072

Is part of

Plant, Cell and Environment, 2013, vol. 36, núm. 8, p. 1435-1448