Commercially valuable tree stands take hit in Pacific Northwest
Global warming may be a factor in the spread of a fungus affecting valuable Douglas fir forests in the Pacific Northwest. Needle cast disease has recently spread across 590,000 acres in Oregon, quadrupling since the start of surveys in 1996. The annual economic loss has been estimated at $128 million.
“The correlation between disease severity and climate factors, such as spring moisture and warm winter temperatures, raises the question of a link between disease expansion and climate change,” said researcher Gabriela Ritokova. “Those factors, in combination with lots of Douglas fir and with large springtime fungal spore production, have us where we are now.” Continue reading “Climate change may be factor in spread of tree fungus”→
Study says disastrous tipping points could be reached by 2050
Forests of the future may not be able to remove heat-trapping CO2 from the atmosphere as effectively as previously thought, scientists said in a new study that’s based on an extensive analysis of tree ring data from the past.
“We utilized a network of more than two million tree-ring observations spanning North America. Tree-rings provide a record into how trees that grow in different climates respond to changes in temperature and rainfall,” said Brian Enquist, a professor in the UA’s Department of Ecology and Evolutionary Biology and a fellow of the Aspen Center for Environmental Studies in Aspen, Colorado.
The research challenges assumptions about how forests will respond to warmer average temperatures, increased greenhouse gas emissions, and shifting rainfall patterns. It also suggests that the warming climate already is rapidly pushing many forests towards an ecological tipping point, which may be reached as early as 2050, Exposure to unprecedented temperatures hampers tree growth and makes them susceptible to other stress factors. Continue reading “Forests may not benefit from rising CO2 levels”→
Settlement addresses pesky Adventure Pass fees on 4 Southern California national forests
A long-running and stubborn battle by activists against the spread of public lands access fees has paid off once again in Southern California, where the U.S. Forest Service agreed to designate and mark free parking areas for hikers who aren’t using developed facilities.
The court-sanctioned deal stems from yet another legal battle over federal recreation fees. Public land agencies started charging for access to plug alleged budget holes; public lands advocates have been trying to limit the spread of the fees and make sure they’ve only levied in the places specifically authorized by Congress — namely at developed recreation sites, and not just for general hiking access. Continue reading “Court deal a win for fee-free public lands access in SoCal”→
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.
Global warming a key factor in surge of giant forest blazes
By Bob Berwyn
With about 1.5 million acres already scarred by wildfires across the U.S. this year, Agriculture Secretary Tom Vilsack is warning of a long, hot fire season ahead. Following a meeting with regional Forest Service leaders, Vilsack, along with Forest Service Chief Tom Tidwell, said that federal budgets are not keeping pace with the steep increase in fires.
Vilsack said 2015 was the most expensive fire season in the department’s history, costing more than $2.6 billion on fire alone.
“The 2016 wildfire season is off to a worrisome start. Southern California, the Great Basin in Nevada, portions of the southwest, and even Florida and Hawaii are particularly vulnerable this year,” Vilsack said. The sustained California drought killed more than 40 million trees, which are all potential fuel, and projections for hot summer weather, driven by global warming and a massive El Niño hangover, will likely increase the danger even more, he added. Continue reading “U.S. wildfire season on pace to break last year’s record”→
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.