%AVinod, Nidhi [Conservation Ecology Center Smithsonian's National Zoo &, Conservation Biology Institute Front Royal VA 22630 USA, Department of Ecology and Evolutionary Biology UCLA Los Angeles CA 90039 USA]%ASlot, Martijn [Smithsonian Tropical Research Institute Apartado Postal 0843‐03092 Panama City Panama]%AMcGregor, Ian [Center for Geospatial Analytics North Carolina State University Raleigh NC 27607 USA]%AOrdway, Elsa [Department of Ecology and Evolutionary Biology UCLA Los Angeles CA 90039 USA, Department of Organismic and Evolutionary Biology Harvard University Cambridge MA 02138 USA]%ASmith, Marielle [Department of Forestry Michigan State University East Lansing MI 48824 USA, School of Natural Sciences, College of Environmental Sciences and Engineering Bangor University Bangor LL57 2DG UK]%ATaylor, Tyeen [Department of Civil &, Environmental Engineering University of Michigan Ann Arbor MI 48109 USA]%ASack, Lawren [Department of Ecology and Evolutionary Biology UCLA Los Angeles CA 90039 USA]%ABuckley, Thomas [Department of Plant Sciences University of California Davis CA 95616 USA]%AAnderson‐Teixeira, Kristina [Conservation Ecology Center Smithsonian's National Zoo &, Conservation Biology Institute Front Royal VA 22630 USA, Smithsonian Tropical Research Institute Apartado Postal 0843‐03092 Panama City Panama]%BJournal Name: New Phytologist; Journal Volume: 237; Journal Issue: 1; Related Information: CHORUS Timestamp: 2023-11-28 17:08:42 %D2022%IWiley-Blackwell %JJournal Name: New Phytologist; Journal Volume: 237; Journal Issue: 1; Related Information: CHORUS Timestamp: 2023-11-28 17:08:42 %K %MOSTI ID: 10384694 %PMedium: X; Size: p. 22-47 %TThermal sensitivity across forest vertical profiles: patterns, mechanisms, and ecological implications %XSummary

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 canopyTleaf. 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 damagingTleafthan their smaller counterparts, particularly under climate change. By contrast, understory trees experience fewer extreme highTleaf'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.

%0Journal Article