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Red Alder (Alnus Rubra Bong.)

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Red Alder (Alnus Rubra Bong.) &]Forest An American Wood .S Service . Red United States Department of Agriculture Alder FS-215 Red alder is the most common hard­ wood in the Pacific Northwest and the largest of the American alders. It is a fast-growing, pioneer species and has nitrogen-fixing nodules on its roots. The wood is diffuse-porous, moderately light. and soft. It has excellent turning and polishing characteristics and takes glue, paint, and stain well. Major uses are for furniture, cabinets, and pallets, but substantial amounts are also used to make paper. F-320966 An American Wood Red Alder (Alnus mbra Bong.) Constance A. Harrington' Distribution The range of red alder extends from southern California Oatitude 340 N.) to southeastern Alaska (600 N.) (fig. 1). Red alder is not commonly found east of the Cascade or Sierra Nevada / Ranges, although there are several " isolated populations in northern Idaho. The species develops best at low eleva­ ; tions (below 1,500 ft) in northern / / Oregon, Washington, and British Co­ I lumbia. In the central part of its range, / scattered trees occur as high as 3,300 feet, but most stands are below 2,500 / I feet. o Red aIder grows in humid or superhumid climatic conditions. Throughout the tree's range, annual precipitation varies from 16 to 220 inches, with most faIling as rain during winter. Low winter temperatures and / lack of precipitation during the growing / season appear to be the main limits to So the range of the species. For good tree development, annual precipitation / ! should exceed 25 inches, or tree roots should have access to ground water. The best stands grow on deep, weIl­ ! I drained loams or sandy loarns of alluvial or volcanic origin. Red alder / tolerates poorly drained conditions and some flooding during the growing season; consequently, stands on wet or f poorly drained soils are common. It I often occurs as a component of mixed . stands that include Douglas-fir J' I (Pseudotsuga men::.iesii), western hemlock (Tsuga heterophylla), western redcedar (Thuja pUcata), grand fir (Abies grandis), black cottonwood (Populus trichocarpa), bigleaf maple (Acer macrophyllum), and willow (Salix). / o ! I I I I I • I ii ' I . j I Research Forester, U.S. Department of o 200 400 6O 'LOMETERS Agriculture, Forest Service, Southern Station, Monticello, Ark. Figure I-Natural range of red alder. F-532737 2 An American Wood Description and Growth On good sites, red alder can attain heights of 100 to 130 feet and diameters of 22 to 30 inches. In closed stands, the trees typically have clear, slightly tapered boles and narrow, domelike crowns. The light-gray bark is thin and smooth. Red alder forms extensive, fibrous root systems. The roots have numerous nitrogen-fixing nodules, which are,a symbiotic associa­ tion between the tree and beneficial bacteria belonging to the genus Frankia. The leaves are dark green and oval or elliptic, with both coarse and fine teeth. They generally range from 2 to 6 inches long (fig. 2). Red alder is a prolific and consistent seed producer. Moderate seed crops are produced almost annually, with bumper crops occurring every 3 to 5 years. The seeds are small, light, winged nuts. There are 23,000 to 86,000 seeds per ounce, and wind dissemination is quite effective. The seeds are borne in Figure 2-Red alder: leaves and conelike strobiles. F-532727 small, woody, conelike strobiles 0.4 to 1.3 inches long and 0.3 to 0. 6 inch taller than 30 feet at age 5, 50 feet at Animal damage is not usually a prob­ wide. Most of the seed is shed in late age 10, and 75 feet at age 20. lem in red alder stands. Occasional fall and early winter. browsing by black-tailed deer Red alder is a relatively short-lived (Odocoileus hemionus columbianus), Seed germination and seedling growth species. It matures at about 60 to 70 girdling of small stems by mountain is best on moist mineral soil with full years of age and maximum age is about beaver (Aplodontia mfa) or meadow sunlight. The species is an aggressive 100 years. Maximum cubic volume of mice (Microtus spp.), and bole damage pioneer on avalanche paths, road cuts, about 7,500 cubic feet per acre is at­ by sapsuckers (Sphyrapicus van'us) log landings, skid trails, and other tained at age 50 to 70 years in pure have been observed. areas where mineral soil has been stands. Most of the alder volume, freshly exposed. Clearcutting and large however, is in mixed stands where Climatic factors can damage red alder. group selection are the most reasonable growth and yield are quite variable. Mortality and top damage may occur regeneration systems. Young red alder after ice storms or unseasonable frosts. sprouts prolifically when cut; however, Red alder is fairly free of insect and Fire is rare because flammable debris coppice regeneration is not likely when disease problems, especially when is scarce in most red alder stands. trees of pole- or saw-log size are young (up to age 40 or 50) and unin­ Windthrow is not common in forest harvested. jured. Fomes igniarius, a white heart stands; however, trees can be blown rot, is probably the major cause of cull over along cutting boundaries or where Height growth of young red alder in older trees. Insect pests are not established root systems have been seedlings is exceptionally rapid. On usually a major concern, but serious undercut by flooding or erosion. favorable sites, they can grow 3 feet or outbreaks of tent caterpillars more the first year; and on all but the (Malacosoma disstrla and M. califor­ The commercial value of red alder has poorest sites, they pass breast height nicum), sawflies (Eriocampa ovata and traditionally been lower than that of its (4.5 ft) the second year. Maximum Hemichroa crocea), and flea beetles associated conifers; consequently, most height growth is usually from 2 to 5 (Altica ambiens and Pyrrhalta punc­ forest managers have tried to eliminate years, but is still excellent after that tipennis) can cause substantial growth alder from conifer stands. However, re­ age. On the best sites, trees can be reduction. cent increases in the value of red alder 3 An American Wood wood and new appreciation of the board feet. Since the early 1950's, Characteristics and Properties species' ability to add nitrogen and lumber production has rapidly in­ organic matter to the soil have resulted creased; in 1980. it was a little more Red alder wood is almost white when in greater interest in managing alder. than 200 million board feet. freshly cut but quickly changes to a light tan or light brown with a yellow or reddish tinge when exposed to the Common Names Red alder has been used for pulpwood air. Heartwood is fonned only in trees since the early 1950's. Although the of advanced age, and there is no visible The species is most commonly called amount used for pulpwood by both boundary between heartwood and red alder, western alder, or just alder. local and foreign mills has been in­ sapwood. Other names !lsed, particularly in the creasing tremendously, there is a great past, are Oregon alder and Pacific deal of annual fluctuation in use. Both Red alder wood is classified as diffuse­ coast alder. the demand and the price paid for alder porous, which means that the pores in chips follow irregular, boom-or-bust the wood do not varv much in size cycles. Most of the fluctuation is Related Commercial Species with changes in seasnal growth rates. caused by changes in the availability of The pores are fairly small and hard to conifer chips, and this is closely tied to Red alder is usually marketed by itself. see without magnification (tig. 3). The the market for structural materials. Some forest inventory figures group the wood has two types of rays: narrow or Pacific coast hardwoods. Although red simple rays, which are closely spaced alder is the primary species, black cot­ When conifer chips become less and not visible without a hand lens, tonwood, bigleaf maple, Oregon ash available, more red alder chips are and broad or aggregate rays, which (Fra;'Cinus latifolia), and varieties of used. This substantially affects the occur at irregular and often wide inter­ paper birch (Betula papyrifera) are amount of red alder that is harvested vals. The annual growth rings include a sometimes included in figures for and chipped. Foreign markets for red wide band of earlywood (wood formed western Washington and Oregon; black alder have been large, but generally er­ at the beginning of the growing season) cottonwood, paper birch varieties, ratic and short lived. In 1980, well and a comparatively narrow band of balsam poplar (Populus balsamifera), over half the alder that was chipped latewood. The rings can be difficult to and quaking aspen (Populus was exported to Japan and Korea. Use distinguish in very fresh wood, but tremuloides) are sometimes included in of red alder for pulping is expected to usually become more distinct with ex­ figures for coastal Alaska. increase; however, annual production posure to air, when the latewood figures will probably remain erratic. becomes visible as fine brown or red­ dish brown lines. Red alder has fine, Supply uniform, straight grain and very smooth Recently, a small, but increasing, texture. When the aggregate rays are The total volume of red alder growing amount of red alder has been used for present in a piece of wood, they form stock in the United States in 1977 was plywood and veneer. In 1980, about 12 an attractive pattern; however, because 7.0 billion cubic feet. Net volume of million board feet was used by the the aggregate rays are irregularly U.S.
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