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Seasonal variability in leaf and whole-tree responses of Populus tremula L. to elevated CO2 and drought

(2021)
Author
Promoter
(UGent) and Roberto Luis Salomon
Organization
Abstract
Trees are exposed to unprecedented climate change, characterized by rapidly rising atmospheric CO2 concentration and longer and more intense drought episodes. Despite research efforts to predict effects of elevated CO2 (eCO2) on tree functioning, its temporal and spatial variability and the interaction between eCO2 and drought remain intensely debated. To address these knowledge gaps, this PhD dissertation investigates the effects of eCO2 on one-year-old European aspen trees at the beginning and the end of the growing season, and under well-watered and drought conditions. For this, leaf and whole-tree water use, carbon gain and carbon loss were monitored during two consecutive growing seasons under ambient or elevated atmospheric CO2 concentration. The conducted literature review and experiments highlight three important insights. First, the magnitude of the effects of eCO2 is highly variable over time, even within a single growing season, as a likely result of the different seasonal carbon requirements throughout plant development. Second, tree responses to eCO2 should not be derived from observations made at the leaf level. Finally, the alleviating effects of eCO2 when facing drought were limited to the leaf level and the late season in European aspen, suggesting a negligible role of CO2 fertilization in mitigating detrimental effects of drought.

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Citation

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MLA
Lauriks, Fran. Seasonal Variability in Leaf and Whole-Tree Responses of Populus Tremula L. to Elevated CO2 and Drought. Universiteit Gent. Faculteit Bio-ingenieurswetenschappen, 2021.
APA
Lauriks, F. (2021). Seasonal variability in leaf and whole-tree responses of Populus tremula L. to elevated CO2 and drought. Universiteit Gent. Faculteit Bio-ingenieurswetenschappen.
Chicago author-date
Lauriks, Fran. 2021. “Seasonal Variability in Leaf and Whole-Tree Responses of Populus Tremula L. to Elevated CO2 and Drought.” Universiteit Gent. Faculteit Bio-ingenieurswetenschappen.
Chicago author-date (all authors)
Lauriks, Fran. 2021. “Seasonal Variability in Leaf and Whole-Tree Responses of Populus Tremula L. to Elevated CO2 and Drought.” Universiteit Gent. Faculteit Bio-ingenieurswetenschappen.
Vancouver
1.
Lauriks F. Seasonal variability in leaf and whole-tree responses of Populus tremula L. to elevated CO2 and drought. Universiteit Gent. Faculteit Bio-ingenieurswetenschappen; 2021.
IEEE
[1]
F. Lauriks, “Seasonal variability in leaf and whole-tree responses of Populus tremula L. to elevated CO2 and drought,” Universiteit Gent. Faculteit Bio-ingenieurswetenschappen, 2021.
@phdthesis{8704444,
  abstract     = {{Trees are exposed to unprecedented climate change, characterized by rapidly rising atmospheric CO2 concentration and longer and more intense drought episodes. Despite research efforts to predict effects of elevated CO2 (eCO2) on tree functioning, its temporal and spatial variability and the interaction between eCO2 and drought remain intensely debated. To address these knowledge gaps, this PhD dissertation investigates the effects of eCO2 on one-year-old European aspen trees at the beginning and the end of the growing season, and under well-watered and drought conditions. For this, leaf and whole-tree water use, carbon gain and carbon loss were monitored during two consecutive growing seasons under ambient or elevated atmospheric CO2 concentration. The conducted literature review and experiments highlight three important insights. First, the magnitude of the effects of eCO2 is highly variable over time, even within a single growing season, as a likely result of the different seasonal carbon requirements throughout plant development. Second, tree responses to eCO2 should not be derived from observations made at the leaf level. Finally, the alleviating effects of eCO2 when facing drought were limited to the leaf level and the late season in European aspen, suggesting a negligible role of CO2 fertilization in mitigating detrimental effects of drought.}},
  author       = {{Lauriks, Fran}},
  isbn         = {{9789463574013}},
  language     = {{eng}},
  pages        = {{vi, 182}},
  publisher    = {{Universiteit Gent. Faculteit Bio-ingenieurswetenschappen}},
  school       = {{Ghent University}},
  title        = {{Seasonal variability in leaf and whole-tree responses of Populus tremula L. to elevated CO2 and drought}},
  year         = {{2021}},
}