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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.
A further study with paper birch and Douglas fir demonstrated that the flow of carbon shifts direction more than once per season: in spring, newly budding birch receives carbon from green Douglas fir, in summer, stressed Douglas fir in the forest understory receives carbon from birch in full leaf, and in fall, birch again receives carbon from ...
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.
A mycorrhiza (from Ancient Greek μύκης (múkēs) ' fungus ' and ῥίζα (rhíza) ' root '; pl. mycorrhizae, mycorrhiza, or mycorrhizas) [1] is a symbiotic association between a fungus and a plant. [2] The term mycorrhiza refers to the role of the fungus in the plant's rhizosphere, the plant root system and its surroundings
By far the best-known is the very widespread and abundant North American species Pseudotsuga menziesii, a taxonomically complex species [14] divided into two major varieties (treated as distinct species or subspecies by some botanists): coast Douglas-fir or "green Douglas-fir", on the Pacific coast; and Rocky Mountain Douglas-fir or "interior ...
Ectomycorrhizal symbiosis, showing root tips with fungal mycelium from the genus Amanita. An ectomycorrhiza (from Greek ἐκτός ektos, "outside", μύκης mykes, "fungus", and ῥίζα rhiza, "root"; pl. ectomycorrhizas or ectomycorrhizae, abbreviated EcM) is a form of symbiotic relationship that occurs between a fungal symbiont, or mycobiont, and the roots of various plant species.
The tree anchors itself with a deep taproot and a web of roots begin to grow laterally. Some roots develop symbiotic relationships with near-by red alders which excel at nitrogen-fixation but lack the storage capacity that the Douglas-fir can offer. In early April of every year, a new layer grows between the bark and wood. As this new layer ...
CMNs occur when fungal mycelia link roots of plants together. [55] The researchers followed seedlings of paper birch and Douglas-fir in a greenhouse for 8 months, where hyphal linkages that crossed their roots were either severed or left intact. The experiment measured amounts of labeled carbon exchanged between seedlings.