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Title

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

AuthorsVoltas, Jordi; Camarero, Jesús Julio ; Carulla, D.; Aguilera, M.; Ortiz, A.; Ferrio, J. P.
Keywordswater-use efficiency
stable isotopes
hydraulic failure
carbon reserves
tree rings
Pinus sylvestris
Issue Date2013
PublisherBlackwell Publishing
CitationPlant, Cell and Environment 36(8): 1435- 1448 (2013)
AbstractWinter-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 (Δ13C and δ18O in tree-ring 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 non-declining 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 Δ13C-δ18O 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. © 2013 John Wiley & Sons Ltd.
Publisher version (URL)http://dx.doi.org/10.1111/pce.12072
URIhttp://hdl.handle.net/10261/87828
DOI10.1111/pce.12072
Identifiersdoi: 10.1111/pce.12072
issn: 0140-7791
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