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Differences in leaf thermoregulation and water use strategies between three co‐occurring Atlantic forest tree species.
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- Author(s): Fauset, Sophie1 ; Freitas, Helber C.2; Galbraith, David R.1; Sullivan, Martin J. P.1; Aidar, Marcos P. M.3; Joly, Carlos A.4; Phillips, Oliver L.1; Vieira, Simone A.5; Gloor, Manuel U.1
- Source:
Plant, Cell & Environment. Jul2018, Vol. 41 Issue 7, p1618-1631. 14p. 1 Color Photograph, 1 Diagram, 3 Charts, 24 Graphs, 1 Map.- Subject Terms:
- Source:
- Additional Information
- Abstract: Abstract: Given anticipated climate changes, it is crucial to understand controls on leaf temperatures including variation between species in diverse ecosystems. In the first study of leaf energy balance in tropical montane forests, we observed current leaf temperature patterns on 3 tree species in the Atlantic forest, Brazil, over a 10‐day period and assessed whether and why patterns may vary among species. We found large leaf‐to‐air temperature differences (maximum 18.3 °C) and high leaf temperatures (over 35 °C) despite much lower air temperatures (maximum 22 °C). Leaf‐to‐air temperature differences were influenced strongly by radiation, whereas leaf temperatures were also influenced by air temperature. Leaf energy balance modelling informed by our measurements showed that observed differences in leaf temperature between 2 species were due to variation in leaf width and stomatal conductance. The results suggest a trade‐off between water use and leaf thermoregulation; Miconia cabussu has more conservative water use compared with Alchornea triplinervia due to lower transpiration under high vapour pressure deficit, with the consequence of higher leaf temperatures under thermal stress conditions. We highlight the importance of leaf functional traits for leaf thermoregulation and also note that the high radiation levels that occur in montane forests may exacerbate the threat from increasing air temperatures. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Plant, Cell & Environment is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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