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Forest health versus global warming: Fuel reduction likely to increase carbon emissions
Date:12/20/2011

CORVALLIS, Ore. Forest thinning to help prevent or reduce severe wildfire will release more carbon to the atmosphere than any amount saved by successful fire prevention, a new study concludes.

There may be valid reasons to thin forests such as restoration of forest structure or health, wildlife enhancement or public safety but increased carbon sequestration is not one of them, scientists say.

In research just published in Frontiers in Ecology and the Environment, Oregon State University scientists conclude that even in fire-prone forests, it's necessary to treat about 10 locations to influence fire behavior in one. There are high carbon losses associated with fuel treatment and only modest savings in reducing the severity of fire, they found.

"Some researchers have suggested that various levels of tree removal are consistent with efforts to sequester carbon in forest biomass, and reduce atmospheric carbon dioxide levels," said John Campbell, an OSU research associate in the Department of Forest Ecosystems and Society. "That may make common sense, but it's based on unrealistic assumptions and not supported by the science."

A century of fire suppression in many forests across the West has created a wide range of problems, including over-crowded forests, increased problems with insect and pathogen attack, greater risk of catastrophic fire and declining forest health.

Forest thinning and fuel reduction may help address some of those issues, and some believe that it would also help prevent more carbon release to the atmosphere if it successfully reduced wildfire.

"There is no doubt you can change fire behavior by managing fuels and there may be other reasons to do it," said Mark Harmon, holder of the Richardson Chair in Forest Science at OSU. "But the carbon does not just disappear, even if it's used for wood products or other purposes. We have to be honest about the carbon cost and consider it along wi
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Contact: Mark Harmon
mark.harmon@oregonstate.edu
541-737-8455
Oregon State University
Source:Eurekalert

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