Tree-ring isotopes from the Swiss Alps reveal non-climatic fingerprints of cyclic insect population outbreaks over the past 700 years

0574055 - ÚVGZ 2024 RIV GB eng J - Článek v odborném periodiku
Vitali, V. - Peters, R. L. - Lehmann, M. M. - Leuenberger, M. - Treydte, K. - Büntgen, Ulf - Schuler, P. - Saurer, M.
Tree-ring isotopes from the Swiss Alps reveal non-climatic fingerprints of cyclic insect population outbreaks over the past 700 years.
Tree Physiology. Roč. 43, č. 5 (2023), s. 706-721. ISSN 0829-318X. E-ISSN 1758-4469
Výzkumná infrastruktura: CzeCOS IV - 90248
Institucionální podpora: RVO:86652079
Klíčová slova: dendroecology * deuterium * ecophysiology * insect defoliation * insect outbreak * plant-pathogen interaction * stable isotope * tree physiology * tree-ring cellulose * zeiraphera griseana
Obor OECD: Forestry
Impakt faktor: 4, rok: 2022
Způsob publikování: Open access
https://academic.oup.com/treephys/article/43/5/706/7026060?login=true

Recent experiments have underlined the potential of delta H-2 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 delta H-2. By exploring a 700-year tree-ring isotope chronology from Switzerland, we assessed the impact of 79 larch budmoth (LBM, Zeiraphera griseana [Hubner]) outbreaks on the growth of its host tree species, Larix decidua [Mill]. The LBM outbreaks significantly altered the tree-ring isotopic signature, creating a H-2-enrichment and an O-18- and C-13-depletion. Changes in tree physiological functioning in outbreak years are shown by the decoupling of delta H-2 and delta O-18 (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 delta H-2. We conclude that the combination of these isotopic parameters can serve as a metric for assessing changes in physiological mechanisms over time.
Trvalý link: https://hdl.handle.net/11104/0344421