On Jan. 14 Parmar took a helicopter flight to a Douglas fir clearcut being carried out down the Mackenzie Forest Service Road ...

$14.50 a foot for Douglas Fir and $17.50 for other types of trees. "It's pretty fair considering all the work that goes into ...

The Cooley gall adelgid is a problem in Douglas fir Christmas tree plantations especially when the two host species, spruce (primary host) and Douglas fir (alternate host) are planted close to one ...

As aridity increased, ecosystem-level tree species richness declined on average from four to one species, Douglas-fir site index declined from 30 to 15 m, and ecosystem carbon storage decreased from ...