Climate change is wiping out forests on a staggering scale
California’s multiyear drought killed even more trees than previously thought, the U.S. Forest Service announced this week. Aerial and ground surveys show that 26 million trees across six counties in Southern California died, in addition to the 40 million trees that died statewide from 2010 to October 2015. Four years of drought, high temperatures and an outbreak of tree-killing bark beetles all contributed the historic levels of tree die-off, the agency said.
Around the same time, pine beetles started spreading across northern Colorado, parts of Wyoming and North Dakota, ultimately killing millions of acres of forest. And just as the pine beetle infestation waned, a spruce beetle outbreak in southern Colorado started to spread. Since 1996, spruce beetles have killed trees across about 1.5 million acres of forest.
New study focuses on drought-stricken California forests
A rising tide of insect infestations, tree mortality and wildfires — all caused by global warming — has resulted in political pressure for more logging in U.S. Forests, but there’s plenty of research showing that cutting down trees doesn’t do much good and can even increase the fire danger.
New analysis offers important forest health information
Colorful mushrooms that pop up in forests around the world are much more than decorative baubles. Much more than realized, fungi are key components of forest ecosystems, helping to regulate the carbon cycle and driving the nutrient exchange between soil and trees.
The latest results from aerial surveys of Colorado forests shows that spruce beetles are doing the most damage, with infestations detected on 409,000 acres across the state, expanding onto 182,000 acres of previously unaffected forests. Since 1996, spruce beetle outbreaks have caused varying degrees of tree mortality on more than 1.5 million acres in Colorado.
The mapping shows spruce beetles spreading outward from the San Juans to the West Elk Mountains, the Sangre de Cristo Mountains and into the northern part of the state around Rocky Mountain National Park. See the full report here: http://www.fs.usda.gov/goto/USFSR2ForestHealth.
State forest experts said it was the fourth year in a row that spruce beetle outbreaks caused widespread tree mortality. As populations of spruce beetles expand, they are starting to affect higher-elevation stands of Engelmann spruce. The report says blowdown events, combined with long-term drought stress, warmer temperatures and extensive amounts of older, dense spruce, have all contributed to the ongoing spruce beetle outbreak. Continue reading “Aerial forest surveys track continued spread of spruce beetles across Colorado forests”→
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?”→