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In 2011, Douglas-fir represented 34.2% of US lumber exports, to a total of 1.053 billion board-feet. [42] [13] Douglas-fir timber is used for timber frame construction and timber trusses using traditional joinery, veneer, and flooring due to its strength, hardness and durability. [43]
Trees include Douglas-fir – Rocky Mountain Douglas-fir (Pseudotsuga menziesii var. glauca) in the north, and Mexican Douglas-fir (Pseudotsuga lindleyana) extending further south – along with species of pine, fir (Abies durangensis and Abies concolor) and spruce (Picea chihuahuana and Picea engelmannii var. mexicana), and sometimes oaks. [4]
Douglas-fir forests are found on gentle slopes, north-facing slopes, ridges with deep soil, and river terraces with deep sediments, usually underlain with sedimentary rocks. Coast Douglas-fir (Pseudotsuga menziesii ssp. menziesii) is the predominant tree, occupying up to 70% of the forest cover. Broadleaf evergreen trees are relatively few.
Pseudotsuga macrocarpa, commonly called the bigcone spruce or bigcone Douglas-fir, is an evergreen conifer native to the mountains of southern California. It is notable for having the largest (by far) cones in the genus Pseudotsuga , hence the name.
Coast Douglas-fir seed cone, from a tree grown from seed collected by David Douglas Pseudotsuga menziesii var. menziesii has attained heights of 393 feet (120* m). That was the estimated height of the tallest conifer ever well-documented, the Mineral Tree ( Mineral, Washington ), measured in 1924 by Dr. Richard E. McArdle, [ 7 ] former chief of ...
Cedar hemlock douglas-fir forest is a vegetation association in California, United States. This is one of the Kuchler system forest types used to classify California plant communities. [1] As the name implies, dominant tree types are Incense cedar, Western Hemlock and Douglas fir. The forest type is classified FRES20 in the Kuchler system. [2]
The highest elevations in the forest are located in the San Francisco Peaks area north of Flagstaff. Here grow large conifers such as Engelmann spruce, blue spruce, subalpine fir, corkbark fir (a variety of subalpine fir found only in isolated areas of Arizona and New Mexico), Douglas-fir, bristlecone pine, and limber pine. Isolated stands of ...
Coast Douglas-firs (Pseudotsuga menziesii var. menziesii) are nearly always associated with redwoods, but in the north the forests can also include Sitka spruce (Picea sitchensis), western hemlock (Tsuga heterophylla) and western red cedar (Thuja plicata). Like coast Douglas-fir, tanoak (Notholithocarpus densiflorus) is often