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Lack of hydraulic recovery as cause of post-drought foliage reduction and canopy decline in European beech
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 4642368
Author(s) Arend, Matthias; Link, Roman Mathias; Zahnd, Cedric; Hoch, Günter; Schuldt, Bernhard; Kahmen, Ansgar
Author(s) at UniBasel Kahmen, Ansgar
Arend, Matthias
Zahnd, Cedric
Hoch, Günter
Year 2022
Title Lack of hydraulic recovery as cause of post-drought foliage reduction and canopy decline in European beech
Journal New Phytologist
Volume 234
Number 4
Pages / Article-Number 1195-1205
Keywords Fagus sylvatica; canopy dieback; drought legacy; leaf development; leaf-to-sapwood area; loss of xylem hydraulic conductance; non-structural carbohydrates
Mesh terms Droughts; Fagus, physiology; Plant Leaves, physiology; Trees; Water; Xylem, physiology
Abstract European beech (Fagus sylvatica) was among the most affected tree species during the severe 2018 European drought. It not only suffered from instant physiological stress but also showed severe symptoms of defoliation and canopy decline in the following year. To explore the underlying mechanisms, we used the Swiss-Canopy-Crane II site and studied in branches of healthy and symptomatic trees the repair of hydraulic function and concentration of carbohydrates during the 2018 drought and in 2019. We found loss of hydraulic conductance in 2018, which did not recover in 2019 in trees that developed defoliation symptoms in the year after drought. Reduced branch foliation in symptomatic trees was associated with a gradual decline in wood starch concentration throughout summer 2019. Visualization of water transport in healthy and symptomatic branches in the year after the drought confirmed the close relationship between xylem functionality and supported branch leaf area. Our findings showed that embolized xylem does not regain function in the season following a drought and that sustained branch hydraulic dysfunction is counterbalanced by the reduction in supported leaf area. It suggests acclimation of leaf development after drought to mitigate disturbances in canopy hydraulic function.
Publisher Blackwell
ISSN/ISBN 0028-646X ; 1469-8137
Full Text on edoc No
Digital Object Identifier DOI 10.1111/nph.18065
PubMed ID
ISI-Number 000772097200001
Document type (ISI) Journal Article

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