Quantitative Analyses of Morphological Variation of Cross-Sectional Tracheids of Hinoki (Chamaecyparis obtusa Endl.) Near Knot by Image Processing
-
J. Liu
Summary
Eight transverse sections of hinoki (Chamaecyparis obtusa Endl.) were analyzed along the grain near a knot by circularity index (CI), aspect ratio and equivalent diameter. The specimens were divided into two groups, one above and one below the knot, and their distances from the knot were 0 mm (the nearest), 12 mm, 24 mm, and 36 mm, respectively. Another sample was also selected from knot-free wood for reference along the same grain. A gradual decrease in the aspect ratio of tracheids demonstrated that both boundaries and lumina tended to have small differences in length and width as they approached the knot along the grain. CIs of lumina nearest to the knot indicated astonishingly high values with a narrow range from hexagon to ellipse, compared with the others ranging from rectangle, via hexagon, to ellipse. In other words, lumina showed a tendency to become round near the knot. In addition, the equivalent diameters of lumina tended to decrease when approaching the knot, implying that cell wall thickening of tracheids occur near the knot. It should be noted that the above variations in tracheids accompanied changes in grain orientation and annual ring width, especially the sharp transformation nearest to the knot.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
Artikel in diesem Heft
- Weight Loss and Cell Wall Degradation in Rubberwood Caused by Sapstain Fungus Botryodiplodia theobromae
- Changes of EPR Spectra of Wood Impregnated with Copper-Based Preservatives during Exposure to Several Wood-Rotting Fungi
- Quantitative Analyses of Morphological Variation of Cross-Sectional Tracheids of Hinoki (Chamaecyparis obtusa Endl.) Near Knot by Image Processing
- Direct Effects of Wood Characteristics on Pulp and Handsheet Properties of Eucalyptus globulus
- Identification of the Lignan Nortrachelogenin in Knot and Branch Heartwood of Scots Pine (Pinus sylvestris L.)
- Chemical Composition of Lipophilic and Phenolic Constituents of Barks from Pinus nigra, Abies bornmülleriana and Castanea sativa
- Pinus pinaster Oleoresin in Plus Trees
- Determination of Polyphenolic Content of Bark Extracts for Wood Adhesives
- Softwood Bark Pyrolysis Oil-PF Resols. Part 2. Thermal Analysis by DSC and TG
- Softwood Bark Pyrolysis Oil-PF Resols. Part 3. Use of Propylene Carbonate as Resin Cure Accelerator
- Steam Explosion of Aspen Wood. Characterisation of Reaction Products
- Characterization of Black Liquors from Soda-AQ Pulping of Reed Canary Grass (Phalaris arundinacea L.)
- Modification of the Nitrogen Content and C:N Ratio of Sitka Spruce Timber by Kiln and Air Drying
- High Resolution Measurement of the Surface Layer Moisture Content during Drying of Wood Using a Novel Magnetic Resonance Imaging Technique
- Longitudinal Permeability and Diffusivity of Steam in Beech Determined with a Wicke-Kallenbach-Cell
- UF/pMDI Wood Adhesives: Networks Blend versus Copolymerization
Artikel in diesem Heft
- Weight Loss and Cell Wall Degradation in Rubberwood Caused by Sapstain Fungus Botryodiplodia theobromae
- Changes of EPR Spectra of Wood Impregnated with Copper-Based Preservatives during Exposure to Several Wood-Rotting Fungi
- Quantitative Analyses of Morphological Variation of Cross-Sectional Tracheids of Hinoki (Chamaecyparis obtusa Endl.) Near Knot by Image Processing
- Direct Effects of Wood Characteristics on Pulp and Handsheet Properties of Eucalyptus globulus
- Identification of the Lignan Nortrachelogenin in Knot and Branch Heartwood of Scots Pine (Pinus sylvestris L.)
- Chemical Composition of Lipophilic and Phenolic Constituents of Barks from Pinus nigra, Abies bornmülleriana and Castanea sativa
- Pinus pinaster Oleoresin in Plus Trees
- Determination of Polyphenolic Content of Bark Extracts for Wood Adhesives
- Softwood Bark Pyrolysis Oil-PF Resols. Part 2. Thermal Analysis by DSC and TG
- Softwood Bark Pyrolysis Oil-PF Resols. Part 3. Use of Propylene Carbonate as Resin Cure Accelerator
- Steam Explosion of Aspen Wood. Characterisation of Reaction Products
- Characterization of Black Liquors from Soda-AQ Pulping of Reed Canary Grass (Phalaris arundinacea L.)
- Modification of the Nitrogen Content and C:N Ratio of Sitka Spruce Timber by Kiln and Air Drying
- High Resolution Measurement of the Surface Layer Moisture Content during Drying of Wood Using a Novel Magnetic Resonance Imaging Technique
- Longitudinal Permeability and Diffusivity of Steam in Beech Determined with a Wicke-Kallenbach-Cell
- UF/pMDI Wood Adhesives: Networks Blend versus Copolymerization
