Old growth Douglas fir trees stand along the Salmon River Trail on the Mount Hood National Forest outside Zigzag in this 2004 photo. The Obama administration on Friday , extended a moratorium on ...

The best way to identify a Douglas fir — that ubiquitous American evergreen ... Volpe focuses on the conditions that create the crisis. Red, orange and yellow charts show how this part of ...

It also pinpointed which conditions are causing low growth among Douglas fir trees. UC Davis researcher Christina Restaino examines a tree core in a Sierra Nevada forest in 2016. Photo: Courtesy ...

Even-aged stands of Douglas-fir allow the fungus to build up, releasing spores that spread with the wind. Reductions in growth of 20 percent to 30 percent are fairly common. At some sites ...

Courtesy of University of California - Davis Restaino said that means Western forests will likely produce less commercial timber and sequester less carbon as Douglas fir tree growth slows.

If so, how many? Much of the Douglas-fir lumber today is coming from trees under 100 years old, which are called second-growth. Lumber properties may not be as high as with old growth, but the ...

When the first English colony was established at Jamestown in 1607, the Douglas fir seedling was about eight ... The school's foresters cut 16 acres of old-growth, which its interim dean now ...

It also pinpointed which conditions are causing low growth among Douglas fir trees. "Warm, dry conditions can push these trees beyond their threshold of tolerance," said lead author Christina ...

It also pinpointed which conditions are causing low growth among Douglas fir trees. "Warm, dry conditions can push these trees beyond their threshold of tolerance," said lead author Christina ...