Effects of timing and intensity of thinning on wood structure and chemistry in Norway spruce
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Tuula Jyske
Abstract
The effects of thinning intensity on wood structure and chemistry of Norway spruce [Picea abies (L.) Karst.] have been studied in a long-term thinning experiment established in the 1960s in south-western Sweden. The experiment comprised datasets of unthinned control trees and trees of four thinning treatments, in which thinning operations of different intensities were carried out. These thinning operations were applied either once, three, or five times over the course of the stand rotation. Thinning intensities varied from 0% to 60% based on the stand basal area (BA) before thinning: (A) 5×20% (i.e., 20% of the BA removed five times); (B) 3×40% (i.e., 40% of the BA removed three times); (C) 1×60% (i.e., 60% of the BA removed once); and (D) 5×40% (i.e., 40% of the BA removed five times). Altogether 60 trees that were 67 years old were sampled 38 years after the treatment onset. Radial growth rate, wood density, tracheid properties, and the chemical composition of wood were studied in detail. All four thinning treatments increased growth rate and decreased wood density; however, treatment D showed the greatest change. Single, heavy thinning in treatment C resulted in unfavourable intra-stem variation in ring width and wood density. No significant differences in tracheid properties and wood chemistry were found between the treatments. We conclude that only a remarkable increase in growth rate would induce detrimental changes in tracheid properties and wood chemistry in the context of thinning.
©2010 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Original Papers
- Initiating ECF bleaching sequences of eucalyptus kraft pulps with Z/D and Z/E stages
- Characterization of black liquors from kraft pulping of first-thinning Scots pine (Pinus sylvestris L.)
- Analysis of products from the oxidation of technical lignins by oxygen and H3PMo12O40 in water and aqueous methanol by size-exclusion chromatography
- Oxidative polymerisation of models for phenolic lignin end-groups by laccase
- Determination of anionic groups in wood by time-of-flight secondary ion mass spectrometry and laser ablation-inductively coupled plasma-mass spectrometry
- Effects of sample preparation on NIR spectroscopic estimation of chemical properties of Eucalyptus urophylla S.T. Blake wood
- Detection of wet-pockets on the surface of Tsuga heterophylla (Raf.) Sarg. by near infrared (NIR) spectroscopy
- Cellular distribution of coniferin in differentiating xylem of Chamaecyparis obtusa as revealed by Raman microscopy
- Hydrolysis of cellulose and wood powder treated with DMDHEU by a hydrolase enzyme complex, Fenton's reagent, and in a liquid culture of Trametes versicolor
- Effects of timing and intensity of thinning on wood structure and chemistry in Norway spruce
- Effects of calcium-based materials and iron impurities on wood degradation by the brown rot fungus Serpula lacrymans
- Lignin and carbohydrate variation with earlywood, latewood, and compression wood content of bent and straight ramets of a radiata pine clone
- Tensile stress relaxation of wood impregnated with different ACQ formulations at various temperatures
- Estimate of resistance-curve in wood through the double cantilever beam test
- Moisture-induced stresses and distortions in spruce cross-laminates and composite laminates
- Short Note
- Recovery of cellulose and xylan liquefied in ionic liquids by precipitation in anti-solvents
- Meetings
- Meetings
Articles in the same Issue
- Original Papers
- Initiating ECF bleaching sequences of eucalyptus kraft pulps with Z/D and Z/E stages
- Characterization of black liquors from kraft pulping of first-thinning Scots pine (Pinus sylvestris L.)
- Analysis of products from the oxidation of technical lignins by oxygen and H3PMo12O40 in water and aqueous methanol by size-exclusion chromatography
- Oxidative polymerisation of models for phenolic lignin end-groups by laccase
- Determination of anionic groups in wood by time-of-flight secondary ion mass spectrometry and laser ablation-inductively coupled plasma-mass spectrometry
- Effects of sample preparation on NIR spectroscopic estimation of chemical properties of Eucalyptus urophylla S.T. Blake wood
- Detection of wet-pockets on the surface of Tsuga heterophylla (Raf.) Sarg. by near infrared (NIR) spectroscopy
- Cellular distribution of coniferin in differentiating xylem of Chamaecyparis obtusa as revealed by Raman microscopy
- Hydrolysis of cellulose and wood powder treated with DMDHEU by a hydrolase enzyme complex, Fenton's reagent, and in a liquid culture of Trametes versicolor
- Effects of timing and intensity of thinning on wood structure and chemistry in Norway spruce
- Effects of calcium-based materials and iron impurities on wood degradation by the brown rot fungus Serpula lacrymans
- Lignin and carbohydrate variation with earlywood, latewood, and compression wood content of bent and straight ramets of a radiata pine clone
- Tensile stress relaxation of wood impregnated with different ACQ formulations at various temperatures
- Estimate of resistance-curve in wood through the double cantilever beam test
- Moisture-induced stresses and distortions in spruce cross-laminates and composite laminates
- Short Note
- Recovery of cellulose and xylan liquefied in ionic liquids by precipitation in anti-solvents
- Meetings
- Meetings
