EGU21-15377, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-15377
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Tree vitality and forest health: any better indicators?

Paolo Cherubini1,2, Giovanna Battipaglia3, and John L. Innes4
Paolo Cherubini et al.
  • 1Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland (paolo.cherubini@wsl.ch)
  • 2Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, Vancouver BC, Canada
  • 3University of Campania "L. Vanvitelli", Via Vivaldi 43, I-81100 Caserta, Italy
  • 4Department of Forest Resources Management, Faculty of Forestry, University of British Columbia, Vancouver BC, Canada

Forest health, although not yet unanimously defined, has been monitored in the past forty years assessing tree vitality, trying to estimate tree photosynthesis rates and productivity. Used in monitoring forest decline in Central Europe since the 1980s, crown foliage transparency has been commonly believed to be the best indicator of tree condition in relation to air pollution, although annual variations appear more closely related to water stress. Although crown transparency is not a good indicator of tree photosynthesis rates, defoliation is still one of the most used indicators of tree vitality. Tree rings have been often used as indicators of past productivity. However, long-term tree-growth trends are difficult to interpret because of sampling bias, and ring-width patterns do not provide any information about tree physiological processes. In the past two decades, tree-ring carbon and oxygen stable isotopes have been used  to reconstruct the impact of past climatic events, such as drought. They have proven to be useful tools for retrospectively understanding physiological processes and tree response to  stress factors. Tree-ring stable isotopes integrate crown transpiration rates and photosynthesis rates and may enhance our understanding of tree vitality. They are promising indicators of tree vitality. We call for the use of tree-ring stable isotopes in future monitoring programmes.

How to cite: Cherubini, P., Battipaglia, G., and Innes, J. L.: Tree vitality and forest health: any better indicators?, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15377, https://doi.org/10.5194/egusphere-egu21-15377, 2021.

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