"In evaluating the two sets of data, the scientists found that the density in midaltitude conifer forests increased by 34 percent during the 60 years that elapsed. Yet contrary to conventional wisdom—that more trees mean additional carbon storage—they found that the amount of carbon held actually decreased by 26 percent in the same period."
http://www.sciam.com/article.cfm?id=wildfires-may-improve-forests
(team led by Michael L. Goulden of the University of California, Irvine)
May be contradicted by this?:-
"IPCC 'wrong' on logging threat to climate"
http://environment.newscientist.com/channel/earth/climate-change/dn14466-ipcc-wrong-on-logging-threat-to-climate.html
"'A lot of IPCC estimates are heroic first approximations, and should be seen as a starting point, not as received wisdom,' says David Bowman, professor of forest ecology at the University of Tasmania in Hobart.
The global implications are not yet clear. It could be that the carbon-storing ability of other temperate forests, such as those along the Pacific coast of the US, have also been underestimated."