Abstract
Context
In the Mediterranean area, numerous decline and mortality processes have been reported during recent decades, affecting forest dynamics. They are likely due to increases in summer drought severity and therefore especially affect drought-sensitive species, such as silver fir (Abies alba Mill.).
Aims and methods
To understand the relationships between tree growth, crown condition and mortality probability, radial growth trends of healthy, declining (showing crown damages) and dead trees were compared using tree-ring analysis. Factors involved in determining this mortality were also examined at the plot and tree level using altitudinal gradients on three contrasted sites in southeastern France.
Results
Individuals with higher inter-annual variability in growth were more prone to dieback. At two sites, dead trees displayed lower growth rates over their entire lifetime, while, on the last site, their juvenile growth rate was higher. Trees with crown damage had higher growth rates than healthy trees on one site, and their radial growth trends over time always differed from those of dead trees. Mortality and crown damage were little related to altitude, but strongly differed between sites and among plots underlining the importance of local edaphic and topographic conditions.
Conclusion
These results suggest that the relationships among mortality probability, crown condition and growth can differ among sites, and highlight the impact of soil conditions and the need to assess them in tree mortality studies.
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Acknowledgments
The authors wish to thank N. Mariotte, W. Brunetto, F. Courdier, S. Rachedi and A. Fourrier for their contribution to field measurements and dendrochronological analyses. We are also grateful to anonymous reviewers and to the editors for valuable suggestions during the review process.
Funding
M.C. received a Ph.D. student grant from the French Research National Agency (ANR), which also supported research funding in the frame of the DRYADE project (ANR-06-VULN-004).
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Handling Editor: Nathalie Breda
Contribution of the co-authors
All co-authors contributed to field measurements. Maxime Cailleret performed data analysis and wrote the manuscript. Marie Nourtier, Annabelle Amm and Marion Durand-Gillmann contributed to the revision and amelioration of the manuscript. Hendrik Davi wrote the manuscript and supervised the whole project.
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Fig. S1
Location of the study sites (DOC 350 kb)
Table S1
Coefficients of the best general linear models between sapwood area and diverse tree parameters (basal area, cambial age, altitude and distance/diameter ratio competition index) for trees growing on Mont Ventoux, Issole and Vésubie. Models were chosen using a stepwise algorithm minimising the AIC (AIC Ventoux = 5,698; AIC Issole = 1,575.8; AIC Vésubie = 548.9). Statistical significance as *p < 0.05; **p < 0.01; ***p < 0.001; °p < 0.1; NS not significant (DOC 36 kb)
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Cailleret, M., Nourtier, M., Amm, A. et al. Drought-induced decline and mortality of silver fir differ among three sites in Southern France. Annals of Forest Science 71, 643–657 (2014). https://doi.org/10.1007/s13595-013-0265-0
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DOI: https://doi.org/10.1007/s13595-013-0265-0