University of Oregon Assistant Research Professor James Johnston said he was taught that when a large fire burned a moist, Western Cascade forest to the ground, and the area didn’t burn for hundreds of years afterward, that’s what created a complex, old-growth landscape.
Instead, his study found that ancient tree stumps in the Mount Hood and Willamette National Forests had burn scars from multiple fires over their long lives. It’s the first time tree-ring scars have been used to document fire records in the region.
Johnston said forests are complex because of—not in spite of—lower-severity wildfires which don’t kill many of the trees…