The scientists then examined how growth rates have changed in the trees over a 91-year time frame, from 1916 to 2006. Using climate data, they showed that as temperature increases in future decades, ...

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 ...

Increased water deficit decreases Douglas fir growth throughout western US forests. Proceedings of the National Academy of Sciences , 2016; 201602384 DOI: 10.1073/pnas.1602384113 Cite This Page : ...

Douglas fir trees are consistently sensitive to drought conditions that occur throughout the species' range in the United States, according to a study led by a researcher at the University of ...

The Douglas fir is under threat from drought, heat and a native beetle. advertisement. The uncertain fate of America’s iconic Christmas tree. Story by John D. Sutter • 2mo.

A new study finds the West is likely to see slower-growing Douglas fir trees in the future, as temperatures and droughts increase with climate change. June 7, 2025 contribute now ...

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 ...

Douglas-fir has a green specific gravity (SG) of 0.45. At 6 percent MC, the SG is 0.50. The weight, when dry, is 32 pounds per cubic foot or about 2.0 pounds per board foot (planed to 3/4-inch ...

Doug Pollock walks through a grove with old-growth trees that had been slated to be clearcut. The university temporarily paused logging of trees older than 160 years after the No Vacancy harvest ...

Dave Powell/USDA Forest Service (retired) / Bugwood.org. All spruce trees have sharp-pointed needles that are often 4-sided or diamond-shaped in cross-section and have four whitish striped lines.