Forests, it's often said, are the lungs of Earth.
Tall trees stretch skyward to find sunlight, sucking water up from their roots and carbon dioxide in through their leaves toLike any chemical reaction, this elemental exchange works best within an optimal temperature range, outside of which a tree's photosynthetic machinery can break down.
Research shows tropical trees can keep photosynthesizing up to 46.7 °C on average. But the world doesn't warm evenly, and neither do forest canopies.among species and populations, and possibly even within leaves of the same tree, Goldsmith says. "You need both the ground and satellite-based observations to understand the temperatures of these tropical forest canopies," Goldsmith explains,"because for leaf temperatures, it's really not the averages that are important; it's the extremes."
In times of drought when soils are parched, heat might intensify for water-stressed trees, as soil moisture also impacts canopy leaf temperatures. The model simplifies forest dynamics with a host of assumptions, but nevertheless, simulations suggest that up to 1.4 percent of upper canopy leaves might get too hot to photosynthesize under future warming scenarios.
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