Search results
Results From The WOW.Com Content Network
Douglas-fir is one of the world's best timber-producing species and yields more timber than any other species in North America, making the forestlands of western Oregon, Washington, and British Columbia the most productive on the continent. In 2011, Douglas-fir represented 34.2% of US lumber exports, to a total of 1.053 billion board-feet.
The growth form is straight, with a conical crown from 12–30 m (39–98 ft) broad, and a strong and spreading root system. The bark is deeply ridged, composed of thin, woodlike plates separating heavy layers of cork; bark of trees over 1 m (3.3 ft) in diameter is from 15–20 cm (5.9–7.9 in) thick. The main branches are long and spreading ...
Douglas firs had higher rates of ectomycorrhizal fungal diversity, richness, and photosynthetic rates when planted alongside root systems of mature Douglas firs and Betula papyrifera than compared to those seedlings who exhibited no or little growth when isolated from mature trees. [66]
The Douglas fir is a fairly adaptable species and can be grown in much of the United States. In addition to the nursery’s location, the type and location of farms that purchase the seedlings or rooted cuttings also plays an important role in the type of tree that is propagated.
Phytophthora root rot Phytophthora spp. Pitted sap rot Trichaptum abietinum: Red-brown butt rot Phaeolus schweinitzii: Red ring rot Phellinus pini: Rhabdocline needle cast Rhabdocline pseudotsugae. Rhabdocline weirii. Rhizina root disease Rhizina undulata: Rose fomes rot Fomitopsis cajanderi: Rust-red stringy white rot Echinodontium tinctorium ...
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 ...
Laminated root rot also known as yellow ring rot is caused by the fungal pathogen Phellinus weirii.Laminated root rot is one of the most damaging root disease amongst conifers in northwestern America and true firs, Douglas fir, Mountain hemlock, and Western hemlock are highly susceptible to infection with P. weirii.
She discovered that Douglas firs provide carbon to baby firs. She found that there was more carbon sent to baby firs that came from that specific mother tree, than random baby firs not related to that specific fir tree. It was also found that the mother trees change their root structure to make room for baby trees. [12]