Dynamic biotic controls of leaf thermoregulation across the diel timescale
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AbstractLeaf thermoregulation and consequent leaf-to-air temperature difference (Delta T) are tightly linked to plant metabolic rates and health. Current knowledge mainly focus on the regulation of environmental conditions on Delta T, while an accurate assessment of biotic regulations with field data remains lacking. Here, we used a trait-based model that integrates a coupled photosynthesis-stomatal conductance model with a leaf energy balance model to explore how six leaf traits (i.e. leaf width, emissivity, visible and near-infrared light absorptance, photosynthetic capacity-Vc,max25, and stomatal slope-g1) regulate Delta T variability across the diel timescale. We evaluated the model with field observations collected from temperate to tropical forests. Our results show that: (1) leaf traits mediate large Delta T variability, with the noon-time trait-mediated Delta T variability reaching c. 15.0 degrees C; (2) leaf width, Vc,max25, and g1 are the three most important traits and their relative importance in Delta T regulation varies strongly across the diel timescale; and (3) model-derived trait-Delta T relationships match field observations that were collected close to either midday or midnight. These findings advance our understanding of biotic controls of leaf-level Delta T variability, highlighting a trait-based representation of leaf energy balance that can improve simulations of diverse leaf thermoregulation strategies across species and physiological responses to climate change.
Acceptance Date14/01/2022
All Author(s) ListGuo ZF, Yan ZB, Majcher BM, Lee CKF, Zhao YY, Song GQ, Wang B, Wang X, Deng Y, Michaletz ST, Ryu Y, Ashton LA, Lam HM, Wong MS, Liu LL, Wu J
Journal nameAgricultural and Forest Meteorology
Detailed descriptionGuo ZF, Yan ZB, Majcher BM, Lee CKF, Zhao YY, Song GQ, Wang B, Wang X, Deng Y, Michaletz ST, Ryu Y, Ashton LA, Lam HM, Wong MS, Liu LL, Wu J*
Year2022
Month3
Day15
Volume Number315
PublisherELSEVIER
Article number108827
ISSN0168-1923
eISSN1873-2240
LanguagesEnglish-United Kingdom
KeywordsLeaf-to-air temperature difference, Plant functional traits, Leaf energy balance, Coupled photosynthesis-stomatal conductance, model, Trait-based modeling, Global sensitivity analysis
Web of Science Subject CategoriesAgronomy;Forestry;Meteorology & Atmospheric Sciences;Agriculture;Forestry;Meteorology & Atmospheric Sciences

Last updated on 2024-12-04 at 10:40