Geos Institute Chief Scientist speaks to packed house in Portland's Revolution Hall on the ecology of wildfires and attempts by the Trump administration and congressional allies to radically increase logging on public lands.
Politicians say thinning forests will help prevent ‘catastrophic’ fires. But ecologists say this season wasn’t the worst, and logging won’t stop it from happening again.
According to peer-reviewed studies on the overall likelihood of a thinned area of forest being hit with fire and on historical fire trends, the argument that thinning is the best way to address future fire seasons like the one we just had is profoundly flawed.
For one, proposals to remove trees, or “fuels,” are based on the idea that fires burn more intensely in unlogged forests, making them more severe and quicker to spread.
But a recently published examination of the intensity of 1,500 forest fires over the past 40 years in 11 Western states found the opposite. Its authors, scientists at the Project Earth Institute, Geos Institute and Earth Island Institute, found fires burned most intensely in previously logged areas. In contrast, in wilderness, parks and roadless ares, the fires burned in mosaic patterns – which maintain healthy, resilient forests.
Both sides of the thinning debate frequently point to one-off incidents to show how thinning either is or is not effective.
“You have to be careful about anecdotal information,” warned Dominick DellaSala, a renowned fire ecologist and chief scientist at the Geos Institute. “Wind speed can change, humidity levels can change, and if you don’t account for all those factors, you could conclude either way. Either the thinning helped, or the thinning didn’t help, depending on what was going on with the fire climate.”
Read the full article at streetrootsnews.org
By Dominick DellaSala, Ph.D.
Wildfires are greatly impacting human communities in the West that every summer face the prospects of loss of life, homeowner damages, and smoke-filled skies. Legislators and many managers believe wildfire intensity and occurrence can be greatly reduced by removing environmental safeguards to allow more logging in the backcountry to avoid wildfire “disasters.”
Wildfires are not ecological catastrophes, rather, they are a keystone natural disturbance agent that has maintained the biologically rich and fire-adapted web-of-life in forests of the western United States for millennia. Wildfire area burned, size of large wildfires (>1,000 ac), and length of the fire season have been increasing in recent decades and these increases are at least partially attributed to the emergence of a new fire-climate era that is interacting with human-caused wildfire ignitions and logging related conversion of native fire-resilient forests to flammable tree plantations.
Proposals to radically increase logging of native forests to reduce “fuels” will not achieve their desired outcomes but instead may increase wildfire risks and impair the adaptive capacity of forests to respond to cumulative disturbances in a rapidly changing climate. Responsible wildfire management and climate change policies are needed to:
- reduce greenhouse gas emissions from fossil fuel burning while storing more carbon in forest ecosystems;
- prioritize vegetation treatments in “fire-sheds” closest to homes;
- redesign the built environment with wildfire safety in mind, including limiting ex-urban sprawl, and
- manage wildfires for ecosystem benefits under safe conditions.
Download the full paper
(photo: Pbjamesphoto/Wikimedia, CC BY-SA 4.0)
Published by The Guardian, November 15, 2017
The US cashes in on timber from ‘devastated’ areas – but the land is actually ‘the rarest and most biodiverse habitat in the Sierra Nevadas’, says an expert
Less than a mile from Yosemite national park, Chad Hanson is wading through a sea of knee-high conifers that have burst from the ashes of the vast 2013 Rim fire. The US Forest Service essentially says the baby trees don’t exist.
The agency says that “catastrophic” fires have “devastated” parts of the forest, painting an eerie picture of swaths of blackened tree trunks like something out of a Tim Burton film.
But the vibrant green pines, firs and cedars surrounding Hanson among the patches burned during California’s third-largest wildfire tell a different story.
Keep reading online at The Guardian