Tropical forests in South America lose their ability to absorb carbon from the atmosphere when conditions become exceptionally hot and dry, according to new research.
For a long time, tropical forests have acted as a carbon sink, taking more carbon out of the air than they release into it, a process that has moderated the impact of climate change.
Operating at the limits of tolerable conditions
Of the 123 plots studied, 119 of them experienced an average monthly temperature increase of 0.5 degrees Celsius. 99 of the plots also suffered water deficits. Where it was hotter, it was also drier.
A member of the fieldwork team taking measurements from one of the trees. Picture: Emilio Vilanova
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Top image shows the valley forest at Chapada de Guimaraes, Brasil. It is the kind of peripheral Amazon forest that is especially vulnerable to drought. Picture: Rainfor