Abstract
Climate change is increasingly favouring the occurrence of extreme weather events, affecting species distribution and tree growth. It has been proposed that mixed forests are more resistant to drought spells and heat waves than corresponding monocultures. We sampled tree cores in nine plots along a latitudinal gradient of the Italian Peninsula (Trentino, Molise and Calabria). The objective of the study was to identify radial growth responses in mixed-species and pure plots of European beech and silver fir to climate dynamics and extreme events. Pointer years, as well as correlation and response functions, were used to analyse the climate–growth relationships in mixed-species and pure plots. Climate–growth relationships showed differences between mixed-species and pure plots only at the regional level. In particular, Trentino differed from Molise and Calabria, when considering maximum temperatures. In Trentino, winter (for silver fir) and summer (for both species) temperatures had a less negative impact on the radial growth of trees, in comparison with Molise and Calabria. Nevertheless, correlations between the radial growth and drought indices, and the principal component analysis, showed that plots were relatively unresponsive to summer drought. These results can be important for the implementation of operational techniques that increase the adaptation of silver fir and European beech to climate change, as well as for assisted migration.
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Acknowledgements
This study generated from the COST (European Cooperation in Science and Technology) Action CLIMO (Climate-Smart Forestry in Mountain Regions - CA15226) financially supported by the EU Framework Programme for Research and Innovation HORIZON 2020. The authors thank: Alberto Garofalo and Agostino Venturino (Carabinieri Forestali), and Lorenzo Frizzera for their suggestion in selecting the study sites; Damiano Zanocco for providing information on past forest management; Chiara Calderaro, Tommaso Tagliafierro, Stefania Di Lella, Marco di Cristofaro, Francesco Parisi, Serena Antonucci, Giovanni Santopuoli and Maaz Hashmi for helping in field activities; Michele Dalponte for his support in data processing.
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Versace, S., Gianelle, D., Garfì, V. et al. Interannual radial growth sensitivity to climatic variations and extreme events in mixed-species and pure forest stands of silver fir and European beech in the Italian Peninsula. Eur J Forest Res 139, 627–645 (2020). https://doi.org/10.1007/s10342-020-01274-8
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DOI: https://doi.org/10.1007/s10342-020-01274-8