An Investigation of the Longitudinal Growth Stresses in Trees PDF Download
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Author: Irwin L. Post
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Author: Irwin L. Post
Publisher:
ISBN:
Category :
Languages : en
Pages : 108
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Book Description
Author: Robert R. Archer
Publisher: Springer Science & Business Media
ISBN: 3662025116
Category : Technology & Engineering
Languages : en
Pages : 251
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Book Description
Although over 40 years have passed since Jacobs (1945) convincingly established the basic radial pattern of residual growth stress in growing trees, yet this phenomenon is still not widely appreciated in wood science and technology circles. This is in spite of the fact that the presence of these stresses of sizeable magnitudes has long been recognized as a primary cause of shakes and splits in logs as well as the warping of lumber sawn in the green condition. The presentation of the subject of growth stresses in trees presents some special problems due to the wide range of specialists who potentially might have an interest in the subject. For example, tree physiologists interested in questions such as the relation of mechanical stress to stem taper and the role of reaction wood and gravity forces in determining tree crown form encounter growth stress models. Silvi culturists interested in the relation ofthinning practices to wood quality find that wood properties are correlated with growth stress levels which are in turn significantly changed by cutting practices. Wood techno logists interested in the relation of residual growth stress gradients in green logs to the dimensional quality of sawn and seasoned lumber are forced to take a more quantitative approach to the effect of growth stresses than might have been the case in the past.
Author: J. D. Boyd
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 86
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Author: Claus Mattheck
Publisher: Springer Science & Business Media
ISBN: 3642612199
Category : Technology & Engineering
Languages : en
Pages : 141
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Book Description
Here are two physicists looking over the fence of physics, getting thrilled by the life and growth of trees, taking an altogether different, exciting view of wood: trees produce wood for their own benefit. They do not live for the benefit of man who builds his world using wood as a raw material. Timber is revealed in a different light, and the reader is taught to stop thinking of it in terms of defective beams and boards. Wood only fails as a part of the living tree. To us, the tree and wood biologists, this new definition is a real, inspiring challenge, which is just what Kubler and Mattheck intended it to be. Their answers may seem too simple or little logical to some of us; but the authors are not at a loss for sound and solid arguments. Their field studies prove the incredible, their hypotheses makes us want to get to the bottom of the un proven unbelievable. The authors' answers and arguments are bold and cour ageous. They arouse our curiosity and force us to fathom the facts. It seems as if Kubler and Mattheck wanted to trick us into believing that trees only live and react following mechanical rules and strategies. To tell the truth, that was what I first suspected the authors of: but I was wrong.
Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 294
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Author: International Union of Forestry Research Organizations. Section 41. Working Groups of Wood Quality, Sawing and Machining, and Tree Chemistry
Publisher:
ISBN:
Category : Lumber
Languages : en
Pages : 478
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Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 18
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 852
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 114
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 60
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Book Description
