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    Author(s): Joel W. Evans; John F. Senft; David W. Green
    Date: 2000
    Source: Forest products journal. Vol. 50, nos. 7/8 (July/Aug. 2000). :p. 75-87 : ill.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (307 KB)


    The objective of this study was to investigate the influence of juvenile wood on the mechanical and physical properties of red alder. Tree growth in the first 10 to 20 years, usually referred to as juvenile wood, often influences wood quality by adversely affecting mechanical strength properties. Strength can be reduced up to 50 percent by the presence of juvenile wood. More knowledge of juvenile/mature wood properties will provide practical information for silviculturists and processors of red alder, leading to a more appropriate usage of this species. Six red alder trees were used in this investigation and a collaborative anatomical study by Oregon State University (OSU). The three-point-bending test mini-specimens were taken from a pith-centered, radially oriented slab in the green condition. Sample material was taken at breast height and below the first major branch for height comparison. Measured variables for the Purdue study were modulus of elasticity (MOE), modulus of rupture (MOR), specific gravity (SG), and work-to-failure (Work). MOE in red alder was found to have a mean join point (end of juvenility) of approximately 16 years and 10 years for the bottom and the top sections, respectively. The variability of MOR, SG, and apparent Work property values over time rendered them unsuitable for indicating a juvenile-mature wood join point.

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    Evans, Joel W.; Senft, John F.; Green, David W. 2000. Juvenile wood effect in red alder : analysis of physical and mechanical data to delineate juvenile and mature wood zones. Forest products journal. Vol. 50, nos. 7/8 (July/Aug. 2000). :p. 75-87 : ill.


    Alnus rubra, Juvenility, Mechanical properties, Physical properties

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