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Sunday, April 19, 2009

Climate Change Killing America's Trees at Ever Faster Rates

Trees in western North America are dying at faster and faster rates, and climate change is likely to blame.

The mounting deaths could fundamentally transform Western forests because tree reproduction hasn’t increased to offset losses, according to a new study published Thursday in Science. New seedlings aren’t rising quickly enough to fill the gaps.

“If current trends continue, forests will become sparser over time,” co-author Philip van Mantgem, an ecologist with the U.S. Geological Survey, said in a press conference call. This would be a setback in the fight against global warming because thinner forests with small, young trees store less carbon, so more heat-trapping carbon dioxide would cycle into the atmosphere.

A large-scale transition to such threadbare woods would have other negative effects as well, van Mantgem said. Species that depend on big stands of old growth, such as marbled murrelets and spotted owls, would have much less room to roam. And the risk of catastrophic fires would go up with more dead, dry wood lying around to fuel them.

Read on
The Painting is by Henri Rousseau

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