Thermal sensitivity across forest vertical profiles: patterns, mechanisms, and ecological implications

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Dangosydd eitem ddigidol (DOI)

  • Nidhi Vinod
    Smithsonian's National Zoo & Conservation Biology InstituteUniversity of California, Los Angeles
  • Martijn Slot
    Smithsonian Tropical Research Institute
  • Ian McGregor
    North Carolina State University
  • Elsa Ordway
    University of California, Los AngelesHarvard University
  • Marielle Smith
    Michigan State University
  • Tyeen C. Taylor
    University of Michigan
  • Lawren Sack
    University of California, Los Angeles
  • Thomas Buckley
    University of California, Davis
  • Kristina Anderson-Teixeira
    Smithsonian's National Zoo & Conservation Biology InstituteSmithsonian Tropical Research Institute
Rising temperatures are influencing forests on many scales, with potentially strong variation vertically across forest strata. Using published research and new analyses, we evaluate how microclimate and leaf temperatures, traits, and gas exchange vary vertically in forests, shaping tree, and ecosystem ecology. In closed-canopy forests, upper canopy leaves are exposed to the highest solar radiation and evaporative demand, which can elevate leaf temperature (Tleaf), particularly when transpirational cooling is curtailed by limited stomatal conductance. However, foliar traits also vary across height or light gradients, partially mitigating and protecting against the elevation of upper canopy Tleaf. Leaf metabolism generally increases with height across the vertical gradient, yet differences in thermal sensitivity across the gradient appear modest. Scaling from leaves to trees, canopy trees have higher absolute metabolic capacity and growth, yet are more vulnerable to drought and damaging Tleaf than their smaller counterparts, particularly under climate change. By contrast, understory trees experience fewer extreme high Tleaf's but have fewer cooling mechanisms and thus may be strongly impacted by warming under some conditions, particularly when exposed to a harsher microenvironment through canopy disturbance. As the climate changes, integrating the patterns and mechanisms reviewed here into models will be critical to forecasting forest–climate feedback.


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Tudalennau (o-i)22-47
CyfnodolynNew Phytologist
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Dyddiad ar-lein cynnar1 Rhag 2022
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 1 Ion 2023

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