Vitali, Valentina; Peters, Richard L; Lehmann, Marco M; Leuenberger, Markus; Treydte, Kerstin; Büntgen, Ulf; Schuler, Philipp; Saurer, Matthias (2023). Tree-ring isotopes from the Swiss Alps reveal non-climatic fingerprints of cyclic insect population outbreaks over the past 700 years. Tree Physiology, 43(5), pp. 706-721. Oxford University Press 10.1093/treephys/tpad014
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Recent experiments have underlined the potential of δ2H in tree-ring cellulose as a physiological indicator of shifts in autotrophic versus heterotrophic processes (i.e., the use of fresh versus stored non-structural carbohydrates). However, the impact of these processes has not yet been quantified under natural conditions. Defoliator outbreaks disrupt tree functioning and carbon assimilation, stimulating remobilization, therefore providing a unique opportunity to improve our understanding of changes in δ2H. By exploring a 700-year tree-ring isotope chronology from Switzerland, we assessed the impact of 79 larch budmoth (LBM, Zeiraphera griseana) outbreaks on the growth of its host tree species, Larix decidua. LBM outbreaks significantly altered the tree-ring isotopic signature, creating a 2H-enrichment and an 18O- and 13C-depletion. Changes in tree physiological functioning in outbreak years are shown by the decoupling of δ2H and δ18O (O-H relationship), in contrast to the positive correlation in non-outbreak years. Across the centuries, the O-H relationship in outbreak years was not significantly affected by temperature, indicating that non-climatic physiological processes dominate over climate in determining δ2H. We conclude that the combination of these isotopic parameters can serve as a metric for assessing changes in physiological mechanisms over time.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Climate and Environmental Physics 08 Faculty of Science > Physics Institute |
UniBE Contributor: |
Leuenberger, Markus |
ISSN: |
0829-318X |
Publisher: |
Oxford University Press |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
06 Feb 2023 09:15 |
Last Modified: |
05 Feb 2024 00:25 |
Publisher DOI: |
10.1093/treephys/tpad014 |
PubMed ID: |
36738262 |
Uncontrolled Keywords: |
Zeiraphera griseana dendroecology deuterium ecophysiology insect defoliation insect outbreak plant-pathogen interaction stable isotope tree physiology tree-ring cellulose |
BORIS DOI: |
10.48350/178364 |
URI: |
https://boris.unibe.ch/id/eprint/178364 |
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