Download or read book Spiral Grain in Sitka Spruce Picea Sitchensis written by D. H. Kitojo and published by . This book was released on 1990 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Variation of Spiral Grain in Sitka Spruce Growing in Denmark written by Jon Kehlet Hansen and published by . This book was released on 1999 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wood Properties and Uses of Sitka Spruce in Britain written by John Moore and published by Forestry Commission of Great Britain. This book was released on 2011 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variables Affecting the Stiffness and Distortion of Sitka Spruce written by Timothy N. Reynolds and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inherent in the structure of timber are features affecting dimensional stability, stiffness and strength. These include knots, compression wood and spiral grain. Physical characteristics such as log shape, density, rate of growth, presence of juvenile wood and microfibril angle also affect these properties and, in turn, utilisation. In this thesis, the relationships between tree, log and board variables to the properties of stiffness and distortion of British-grown Sitka spruce (Picea sitchensis) are examined. The research"s main aim was to identify variables which could potentially be used to sort timber. Different behaviour in terms of the relationship between stiffness and variables such as density, knot content, log taper, tree height and axial position were noted between groups of upper log and butt log material, and between the four stands and two sites studied. Relationships between stiffness and these variables were generally weak, notably for density. Overall, variables based on radial position within the stem were not found to be useful sorting parameters. No relationship between batten stiffness and compression wood content or slope of grain was observed. The relatively low stiffness of butt wood material was associated with high microfibril angle. Batten twist was found to be a function of spiral grain angle and distance from pith. However, practical difficulties with the use of slope of grain measurements to sort timber were noted. Although severe forms of compression wood were seen to be associated with stem-form correction, relatively straight logs and those which were round, or without pith eccentricity, were also observed to contain compression wood and hence yield timber which distorted on drying. In particular, this work demonstrates the effect of sorting timber using combined variables (e.g. log shape and knot content). These findings may be of use to foresters, sawmillers and developers of timber scanning technologies.
Download or read book A Plan for the Improvement of Sitka Spruce by Selection and Breeding written by A. M. Fletcher and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Forest Tree Breeding in Europe written by Luc E Pâques and published by Springer Science & Business Media. This book was released on 2013-05-31 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forest tree breeding has been ongoing for more than 70 years across Europe. It has successfully generated improved varieties for the major economical forest tree species. They are part of the present European forestry landscape and largely contribute to intensive wood production and other forest activities. In this book, we describe the state-of-art of breeding for the main forest tree species. We provide a comprehensive, unique and up-to-date overview of the major scientific results and breeding achievements gathered from the many programmes scattered across Europe. The book is divided into 10 chapters, each as a monograph corresponding to a species or group of species Abies spp., (Larix spp., Picea abies, Picea sitchensis, Pinus sylvestris, Pseudotsuga menziesii, and Mediterranean pines; Acer pseudoplatanus, Fraxinus excelsior, and Prunus avium). Each of them is written by a group of experts and focuses on the distribution and economical importance of the species; motivation for breeding and breeding objectives; intraspecific genetic variability, breeding populations and breeding strategy; forest reproductive material deployment including mass-propagation and, prospects and perspectives for joint research and breeding. The book is a unique and up-dated source of information for students, researchers and professionals interested in the genetics and domestication of forest tree species.
Download or read book Sitka Spruce written by A. S. Harris and published by . This book was released on 1984 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bending Strength of Large Alaskan Sitka Spruce and Western Hemlock Log Bridge Stringers written by and published by . This book was released on 1979 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics of Sitka Spruce written by L. R. Roche and published by . This book was released on 1975 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Timberman written by and published by . This book was released on 1917 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Analysis of Spiral Grain in White Spruce written by Emily Franz and published by . This book was released on 2015 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Spiral grain is a wood grain feature found sporadically in trees and has significant effect in sawn lumber and somewhat unknown effects in pulping. It does make up a portion of the harvested trees from a forest and therefore information relating to its fiber properties will be useful, particularly for pulping as its presence, if severe enough, typically renders the wood unusable for lumber. Spiral grain measurements and cores were made on 63 year old plantation white spruce (Picea glauca (Moench) Voss) grown in Northwestern Ontario. Occurrence of spiral grain was established for two different tree spacing treatments. The highest occurrence of spiral grain occurred in the widest spacing of 3.6 m x 3.6 m. Furthermore it was discovered that spiral grain seems to limit the diameter growth in trees."-- from abstract.
Download or read book The Influence of Spiral and Diagonal Grain on the Mechanical Properties of Sitka Spruce and Douglas Fir written by R. F. Luxford and published by . This book was released on 1918 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Selection in Sitka Spruce written by Elspeth Macdonald and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pilodyn pin penetration, acoustic velocity and underbark measurements of spiral grain angle were effective means of identifying the best families for wood density, stiffness and internal spiral grain angle respectively.
Download or read book Genetic Selection in Sitka Spruce written by Elspeth Macdonald and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tree ring Research written by and published by . This book was released on 2006 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spiral Grain Development in Plantation Grown White Spruce Picea Glauca Moench Voss written by Douglas R. Turner and published by . This book was released on 2011 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Home grown Sitka Spruce written by Building Research Establishment and published by . This book was released on 1976 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
