Distribution of Aggregate Rays in Red Alder
Keywords:
Alnus rubra, aggregate rays, wood figure, juvenile wood, adult wood, raysAbstract
The distribution of aggregate rays in 23 trees of red alder was examined. Three patterns of distribution were determined for the relationship between the number of aggregate rays counted at the cambium on the cross section and height in the tree. Aggregate rays are virtually absent in a coneshaped zone of juvenile wood in the lower half of the tree bole but present in varying numbers in the sheath of adult wood surrounding the juvenile core in the lower half of the bole and in both juvenile and adult wood in the upper half of the bole. That pattern explains their sporadic distribution in alder lumber. The number of aggregate rays observed at the cambium on cross sections from ground line to tree tip is not related to tree diameter, geographic location, or quadrant sectors within trees. Clusters of closely spaced aggregate rays are frequently associated with frost injuries, indentures, or undulating annual rings and branch traces.References
Panshin, A. J. and Carl de Zeeuw. 1970. Textbook of wood technology, Volume 1, 3rd edition. McGraw-Hill Book Company, New York, N.Y.n
Downloads
Published
Issue
Section
License
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.