Posted on February 2, 2015 by Bob Berwyn
Forest treatments that focus on removing smaller trees may not be the best tool for western dry forests, according to new research by University of Wyoming scientists.
Study shows many treatments in western dry forests are misguided
By Bob Berwyn
FRISCO — Mid-elevation forests in the western U.S. have survived centuries of drought, wildfires and insect onslaughts by hedging their bets with a diversity of tree sizes, Wyoming researchers said after studying forest plots from the Pacific Northwest down to Arizona and New Mexico.
The research showed that the biggest threat to those forests is from insects and not wildfires. Historically abundant small trees enable those forests to rebound after tree-killing bugs move through. Continue reading
Filed under: Environment, forest fires, Forest health, forests, pine beetles and wildfires | Tagged: Environment, Forest health, forests, West | Leave a comment »
Posted on January 27, 2015 by Bob Berwyn
‘Continued forest carbon accumulation in the region is highly sensitive to land use transitions’
FRISCO — Forest disturbances, such as fire, disease, and cutting, as well as the impacts of land use change, may be slowing the carbon uptake of southeastern U.S. forests, according to a new U.S. Forest Service study.
The research shows that future carbon accumulation rates are highly sensitive to land use changes. Land use choices that either reduce the rate of afforestation or increase the rate of deforestation are key factors in future forest carbon accumulation, the scientists concluded in their report, published in the journal Scientific Reports. Continue reading
Filed under: agriculture, climate change, Environment, Forest health, forests, global warming | Tagged: carbon cycle, climate change, Environment, forests | Leave a comment »
Posted on January 23, 2015 by Bob Berwyn
Oaks, stands of dense, small trees becoming dominant
FRISCO — Hand-written notes from old forest surveys have helped scientists track long-term changes in California forests, including a decline of large trees of up to 50 percent in the Sierra Nevada highlands, the south and central coast ranges and Northern California.
The research team from the University of California, Berkeley, UC Davis and the U.S. Geological Survey compared unique forest surveys collected by UC Berkeley alumnus Albert Wieslander in the 1920s and ’30s with recent U.S. Forest Service data to show that the decline of large trees and increase in the density of smaller trees is not unique to the state’s mountains. Continue reading
Filed under: climate and weather, Environment, Forest health, forests, global warming | Tagged: California, climate change, Environment, forests, Old-growth forest | 2 Comments »
Posted on December 15, 2014 by Bob Berwyn
Can mushrooms help save whitebark pines? Photo courtesy U.S. Forest Service.
Scientists report success in treating seedlings with mushroom spores
FRISCO — High-elevation whitebark pines are under the gun in the northern Rockies. White pine blister rust, an invasive fungus, and pine beetles have combined to drive the species toward extinction.
But scientists trying to recover the species say that a humble mushroom could help their efforts. A three-year experiment shows a 10 to 15 percent increase in the survival rate of whitebark pine seedlings when Siberian slippery jack spores are injected into the soil around them. The injection takes place in nurseries before the seedlings are transplanted in the mountains. Continue reading
Filed under: endangered species, Environment, Forest health, forests, Uncategorized | Tagged: Environment, Forest health, forests, fungi, pine beetles, whitebark pines | Leave a comment »
Posted on December 3, 2014 by Bob Berwyn
Findings challenge carbon-balance assumptions of woody biomass energy boosters
A forest health logging site on Swan Mountain near Dillon, Colorado. bberwyn photo.
FRISCO — Logging forests may have a more significant impact on carbon storage in soils than previously believed, Dartmouth College researchers found after taking a close look at at how timber harvesting affects mineral soil carbon over 100 years.
The study found that, while logging doesn’t immediately release carbon stored in a forest’s mineral soils into the atmosphere, it triggers a gradual release that may contribute to climate change over decades. Continue reading
Filed under: agriculture, climate and weather, Environment, Forest health, forests, global warming, US Forest Service | Tagged: carbon cycle, Environment, Forest health, forests, global warming, logging, soil carbon storage | 2 Comments »
Posted on November 13, 2014 by Bob Berwyn
Study examines nexus of forest, tourism policies
FRISCO — It may be Shangri-La no more if centralized government policies from Beijing continue to supplant community based management schemes for the incredibly diverse temperate forests of China’s northwest Yunnan Province.
Dartmouth scientists found in a recent study that China’s anti-logging, conservation and ecotourism policies are accelerating the loss of old-growth forests in the region, which symbolizes the tensions associated with China’s economic transformation. Continue reading
Filed under: biodiversity, Environment, forests | Tagged: China, Environment, forests, Shangri-la, Tourism, Yunnan Province | Leave a comment »
Posted on November 4, 2014 by Bob Berwyn
Spruce beetle populations are surging in the southern Rocky Mountains. bberwyn photo.
Study calls out inaccurate media reports about links between bugs and wildfires
By Bob Berwyn
FRISCO — Dire warnings about how beetle outbreaks make forests more prone to fires are ringing increasingly hollow, as more and more forest research shows that other factors — especially weather — are more important drivers. In some cases, defoliation by bugs may actually lessen the the threat of disastrous crown fires.
In one of the latest studies, researchers with the University of Oregon and the U.S. Forest Service took a close look at the relationship between fires and spruce budworm infestations in the Pacific Northwest. They found that defoliation reduces both torching and crowning potential. Continue reading
Filed under: Colorado, Environment, forest fires, Forest health, forests | Tagged: crown fires, Forest health, forests, western spruce budworm, Wildfires | Leave a comment »