A retrospective, dual-isotope approach reveals individual predispositions to winter-drought induced tree dieback in the southernmost distribution limit of Scots pine
Article first published online: 25 FEB 2013
© 2013 John Wiley & Sons Ltd
Plant, Cell & Environment
Volume 36, Issue 8, pages 1435–1448, August 2013
How to Cite
VOLTAS, J., CAMARERO, J. J., CARULLA, D., AGUILERA, M., ORTIZ, A. and FERRIO, J. P. (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 & Environment, 36: 1435–1448. doi: 10.1111/pce.12072
- Issue published online: 4 JUL 2013
- Article first published online: 25 FEB 2013
- Accepted manuscript online: 24 JAN 2013 07:16AM EST
- Manuscript Accepted: 16 JAN 2013
- Manuscript Revised: 13 JAN 2013
- Manuscript Received: 24 SEP 2012
- DGI. Grant Numbers: CGL2009-13079-C02-01, CGL2011-26654
- SMARTREES. Grant Number: FP7-PEOPLE-2009-RG-246725
Figure S1. Long-term climatic trends recorded in the study area. Above: mean annual temperatures (T): thin line, CRU dataset; bold line, data from Teruel meteorological station corrected for the altitude of Alcalá de la Selva (−0.65 °C every 100 m gained in elevation). Below: total annual precipitation (P): thin line, CRU dataset; bold line, data from Alcalá de la Selva meteorological station. CRU trends were smoothed by LOESS fitting (span = 0.5). Temperature trends from Teruel were fitted to a linear regression (slope = 0.025 °C yr−1). The grey bars highlight climatic conditions after the 2001–2002 dieback episode.
Figure S2. Trees affected by winter-drought induced dieback in the study area showing brown needles (the photograph was taken in February 2002).
Figure S3. Estimated rates of radial increment for declining (D) and non-declining (ND) trees based on manual band dendrometers recorded in 2008 (means ± SE) and related climatic conditions (T, mean monthly temperature; P, total monthly precipitation).
Figure S4. Frequencies of earlywood (EW) tracheids as a function of their transversal lumen diameter for declining (D, filled bars) and non-declining (ND, hatched bars) Scots pines. The frequencies between both types of trees were computed considering years of high (wide rings: 1976, 1984 and 1992) and low radial growth (small rings: 1974, 1987, 1998). Frequencies were compared among decline classes to test the null hypothesis that the lumen distributions of the two groups of trees did not differ using an adjusted G test (Gadj).
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