World’s oldest and biggest trees ‘dying out’

The trees at risk included mountain ash in Australia, pine trees in America, California redwoods, and baobabs in Tanzania.

The study showed that trees were not only dying en masse in forest fires, but were also perishing at 10 times the normal rate in non-fire years.

The study said it appeared to be down to a combination of rapid climate change causing drought and high temperatures, as well as rampant logging and agricultural land clearing.

“It is a very, very disturbing trend,” said Bill Laurance of James Cook University.

“We are talking about the loss of the biggest living organisms on the planet, of the largest flowering plants on the planet, of organisms that play a key role in regulating and enriching our world.”

Large old trees play critical ecological roles, providing nesting or sheltering cavities for up to 30 percent of all birds and animals in some ecosystems.

They also store huge amounts of carbon, recycle soil nutrients, create rich patches for other life to thrive in, and influence the flow of water within landscapes.

“Big trees supply abundant food for numerous animals in the form of fruits, flowers, foliage and nectar,” said Mr Laurance.

“Their hollows offer nests and shelter for birds and animals… and their loss could mean extinction for such creatures.”

The scientists said policies and management practices must be put in place that intentionally grow such trees and reduce their mortality rates.

“Targeted research is urgently needed to better understand the key threats to their existence and to devise strategies to counter them,” they added.

“Without such initiatives, these iconic organisms and the many species dependent on them could be greatly diminished or lost altogether.”

Source: AFP

Source Article from http://telegraph.feedsportal.com/c/32726/f/568301/s/26598460/l/0L0Stelegraph0O0Cearth0Cenvironment0C97287970CWorlds0Eoldest0Eand0Ebiggest0Etrees0Edying0Eout0Bhtml/story01.htm

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