Biological, Chemical and Mechanical Characteristics of "Wulstholz" as a Response to Mechanical Stress in Living Trees of Picea abies [L.] Karst
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G. Koch
Summary
In the present study, the biological, chemical and mechanical wood properties of “Wulstholz” as a response to mechanical stress of spruce trees (Picea abies [L.] Karst.) were investigated. “Wulstholz” is formed locally on the compression side of overstressed tree trunks after slip planes were initiated. It is characterized by an increased xylem production leading to bulges. The S2-layers of “Wulstholz”-tracheids are thicker than the corresponding cell wall layers in normal wood, and the cell lumen diameter is significantly reduced. The tracheid length decreases gradually from an average of 4 mm to 2.5 mm compared to normal wood, and the tracheids conspicuously are shifted against each other longitudinally. “Wulstholz” contains a higher concentration of lignin than normal wood, whereas the concentration of glucose in the hydrolysates is reduced. The hemicelluloses-concentration, particularly the mannose-content, is significantly higher compared to normal wood. The compression strength and the modulus of elasticity, despite a higher density, are significantly reduced in “Wulstholz” in comparison to normal wood. But due to the specific anatomical and chemical properties, “Wulstholz”-tracheids can be deformed and compressed considerably without fracturing. The investigations demonstrate that “Wulstholz” can restabilize wind-exposed trees.
Copyright © 2000 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Modelling the Moisture Induced Risk of Decay for Treated and Untreated Wood Above Ground
- FTIR Characterization of Copper Ethanolamine—Wood Interaction for Wood Preservation
- Glycerol/Glyoxal: A New Boron Fixation System for Wood Preservation and Dimensional Stabilization
- Removal of Phenolic Hydroxyl Groups in Lignin Model Compounds and Its Effect on Photostability
- Cation Exchange Capacity Tests on Some Lignocellulosic Materials Highlight Some Aspects of the Use of Copper as Wood Preservative
- Biological, Chemical and Mechanical Characteristics of "Wulstholz" as a Response to Mechanical Stress in Living Trees of Picea abies [L.] Karst
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 1. The Reaction of Coniferaldehyde Model Compounds
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 2. The Reaction of Stilbene-Type Model Compounds
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- Determination of Residual Stresses in Medium Density Fibreboard
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- Study of the System Wood – Coating Material. I. Wood – Liquid Coating Material
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- A New Air Dehydration Process for Wood Dryers. Part I. Kinetic and Quality of Drying
- A New Air Dehydration Process for Wood Dryers. Part II. Elimination of Organic Compounds
- A New Method of Sample Preparation for Kenaf Bast Fiber Length Analysis with Automated Fiber Length Analyzer
- Literature Reports
