Large swaths of forest now seen as more vulnerable to future droughts
California’s extended drought may take a long-term toll on the state’s forests, scientists reported last month after studying severe water loss from tree canopies since 2011.
The study, published in the Proceedings of the National Academy of Sciences, says that up to 58 million large trees in California showed signs of being drought stressed, with persistently low rainfall, high temperatures and outbreaks of the destructive bark beetle combining to increase forest mortality risk. Continue reading “California drought has damaged millions of trees”→
With wildfire costs soaring, agency takes funds from other programs
U.S. Forest Service officials said they were able to step up the pace of restoration projects in 2015 despite facing tough budget challenges during a record wildfire season.
Despite the gains, at least 65 million National Forest System acres are still in need of restoration, agency leaders said, explaining that the rising cost of wildfire suppression has taken funding away from restoration, watershed and wildlife programs, limiting the Forest Service’s ability to do the work that would prevent fires in the first place. Continue reading “Forest Service steps up restoration efforts in 2015”→
After combining data from field observations with climate model projections, the research team concluded that 72 percent of the region’s needleleaf evergreen forests will die by 2050, with nearly 100 percent mortality by 2100.
It’s pretty clear that the die-off is already under way. Even drought-resistant species like piñon pines were hit hard by a drought in the early 2000s. A massive bark beetle infestation wiped out millions of acres of lodgepole pines in the southern Rockies, and spruce beetles have taken a big toll on once-lush spruce forests in southern Colorado. Continue reading “Can the Southwest’s forests survive global warming?”→
Climate, topography likely more significant, researchers say
Colorado researchers have added another chapter to the long-running debate over beetle-kill and wildfires, finding that spruce beetle infestations haven’t increased the severity of wildfires in southwestern Colorado.
An extensive tree-ring study in the Northeast suggests a widespread and steady decline in the health of sugar maples, one of most economically and ecologically important trees in the eastern United States and Canada.
The decline started showing up in the 1970s a decline in the growth rate of of sugar maple trees, but the reasons are still unclear, according to the State University of New York researchers who recently published their findings in the open-access journal “Ecosphere.” Continue reading “Environment: More maple tree woes”→
Climate zones in boreal forests are shifting northward ten times faster than the trees’ ability to migrate
FRISCO — The world’s vast boreal forests, stretching around the globe at high latitudes, could reach a climate tipping during this century, according to a team of international researchers who said there needs to be more attention on climate mitigation and adaptation with respect to these forests.