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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 three 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, while leaf temperatures were also influenced by air temperature. Leaf energy balance modelling informed by our measurements showed that observed differences in leaf temperature between two 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 to 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 which occur in montane forests may exacerbate the threat from increasing air temperatures.
This article was published in the following journal.
Name: Plant, cell & environment
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