Effects of thinning and fertilisation on tracheid dimensions and lignin content of Norway spruce
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Tuula Jaakkola
Abstract
The effects of the intensity and timing of commercial thinning and fertilisation on tracheid properties and lignin content of Norway spruce [Picea abies (L.) Karst] were studied in two long-term fertilisation-thinning experiments in central and eastern Finland. The experiments consisted of three thinning and three fertilisation treatments in a randomised block design. Fertilisation levels were: unfertilised (F0), 150 kg N ha-1 (F1), and 300 kg N ha-1 (F2). Thinning treatments were: delayed first thinning (T0), normal thinning (T1), and intensive first thinning (T2). A total of 85 trees were sampled 26 years after treatment onset. Tracheid length was measured for 24 trees and cell wall thickness and lumen diameter for 16 trees grown under treatments F0T0, F0T2, F1T0, and F1T2. Lignin content was determined for all trees sampled (n=85) grown in all the different treatment combinations. We found only small differences in tracheid length (0–6%), cell wall thickness (1–17%) and lumen diameter (0–9%), depending on the different fertilisation and thinning conditions. We also found only slightly (1–2%) higher lignin content for fertilised (F1 and F2) than for unfertilised (F0) trees (25.8% and 26.0% vs. 25.4%). Trees yielded 26.0% lignin content after intensive first thinning (T2), 25.9% following normal thinning (T1), and 25.4% after delayed first thinning (T0). Thus, the prevailing fertilisation and thinning practice for Norway spruce stands in Finland may not cause essential changes in tracheid properties and lignin content.
©2007 by Walter de Gruyter Berlin New York
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Artikel in diesem Heft
- To all readers, authors and subscribers
- Vapor-phase diethyl oxalate pretreatment of wood chips: Part 1. Energy savings and improved pulps
- Vapor-phase diethyl oxalate pretreatment of wood chips: Part 2. Release of hemicellulosic carbohydrates
- Size exclusion chromatographic and UV-VIS absorption analyses of unbleached and bleached softwood kraft pulps using LiCl/1,3-dimethyl-2-imidazolidinone as a solvent
- A new method for the titration of free phenolic groups in pulps
- Adsorption of water-soluble organic dyes on ferrofluid-modified sawdust
- Mechanical properties and creep behavior of lyocell fibers by nanoindentation and nano-tensile testing
- Deformation behavior of wet lignocellulosic fibers
- Changes in physical, mechanical and chemical properties of wood during sterilisation by gamma radiation
- Penetration of poly(ethylene glycol) into wood cell walls of red pine
- Transverse mechanical behaviour and moisture absorption of waterlogged archaeological wood from the Vasa ship
- Determination of residual stress in bonded wood components
- Decohesion of glue bonds in wood connections
- Delamination assessment after drilling medium-density fibreboard (MDF) by digital image analysis
- Effects of thinning and fertilisation on tracheid dimensions and lignin content of Norway spruce
- Detection of β-1-4-galactan in compression wood of Sitka spruce [Picea sitchensis (Bong.) Carrière] by immunofluorescence
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- Sap-staining fungi from logs and boards of two commercially important pines in Korea
- Improved quantitative determination of benzalkonium chloride in treated wood by liquid chromatography
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