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Older Trees Grow Faster

Mature trees soak up more CO2 than younger ones, a study shows, overturning a bit of botanical dogma.

Bob Grant
Bob Grant

Bob Grant is Editor in Chief of The Scientist, where he started in 2007 as a Staff Writer.

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Giant camphor treesWIKIMEDIA, WITSTINKHOUTIt turns out that as a slew of tree species age, they grow faster and gobble up more carbon dioxide than when they were younger, according to a study published last week (January 15) in Nature. The findings, which involved decades of data taken from 673,046 trees in more than 400 tropical and temperate tree species around the globe, contradict a long-standing assumption that tree growth slows as the plants age. “The trees that are adding the most mass are the biggest ones, and that holds pretty much everywhere on Earth that we looked,” Nathan Stephenson, a US Geological Survey ecologist and first author of the study, told Nature. “Trees have the equivalent of an adolescent growth spurt, but it just keeps going.”

The results have important implications for conservation and forestry practices. “Not only do [older trees] hold a lot of carbon,...

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