Giant Surprise: Old Trees Grow Fastest
Jan 15, 2014 | Live Science | Becky Oskin
Like a fairy-tale beanstalk, a tree can grow and grow until it scrapes the sky.
Instead of slowing down as the centuries add up, old trees speed up their growth, according to a study published today (Jan. 15) in the journal Nature.
"Trees keep growing like crazy throughout their life span," said Nate
Stephenson, lead study author and a forest ecologist with the U.S.
Geological Survey (USGS) in Three Rivers, Calif.
The
results of the survey of 403 tree species around the world suggest that
trees never suffer the ill effects of old age. In animals, cells change
and break down over a lifetime, eventually causing death. But trees
seem free from this growth limit, called senescence. Instead, only
disease, insects, fire or accidents such as lightning will kill a tree,
Stephenson said. (He forgot to mention logging, of course.) "They never
stop," he said. "Every year, they are always putting on more weight than
before."
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