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Warming Threatens Sequoias

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The Associated Press

Published: September 6, 2008

VISALIA, Calif. - Federal researchers are warning that warming temperatures could soon cause California's giant sequoia trees to die off more quickly unless forest managers plan with an eye toward climate change and the impact of a longer, harsher wildfire season.

Hot, dry weather during the past two decades already has contributed to the deaths of an unusual number of old-growth pine and fir trees in Yosemite and Sequoia National Parks, according to recent research from the U.S. Geological Survey.

In the next decade, climate change also could start interfering with the giant sequoias' ability to sprout new seedlings, said Nathan Stephenson, one of several scientists speaking Thursday at a government agency symposium on how global warming could affect the Sierra Nevada.

"The first effects of climate change that we're likely to see is that the giant sequoias will have trouble reproducing because their root systems don't work as well when temperatures warm," said Stephenson, a research ecologist with the USGS Western Ecological Research Center.

"After that, I wouldn't be surprised if in 30 years we see their death rates go up."

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