Variation of tracheid length within annual rings of Scots pine and Norway spruce
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Harri Mäkinen
Abstract
Variation of tracheid length was studied within individual annual rings of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) from the pith to the bark. The material consisted of six Scots pine and six Norway spruce trees growing on sites of both low and high fertility. Microtome sections of 0.25 mm thick were cut from annual rings 7, 20 and 50 counted from the pith outwards, i.e., juvenile, transition and mature wood, respectively. After maceration, tracheid lengths were separately measured in each sample. In juvenile wood of Scots pine, tracheids were on average 17% longer in the latewood than in earlywood. However, in juvenile wood, the first formed earlywood tracheids were slightly longer than those in the middle of the earlywood zone. In the transition and mature wood of Scots pine, the increase in tracheid length was more gradual from earlywood to latewood, and no significant differences were found between earlywood and latewood. In Norway spruce, tracheids were 2–4% longer in the latewood than in earlywood. In general, tracheid length is highly variable within annual rings and the variation can differ from ring-to-ring even within the same tree.
©2008 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- Meetings
- Evaluation of Eucalyptus grandis Hill ex Maiden biopulping with Ceriporiopsis subvermispora under non-aseptic conditions
- Paper dry strength improvement by xyloglucan addition: Wet-end application, spray coating and synergism with borate
- A new and facile method for isolation of lignin from wood based on complete wood dissolution
- Isolation and characterization of lignins from Eucalyptus grandis Hill ex Maiden and Eucalyptus globulus Labill. by enzymatic mild acidolysis (EMAL)
- Fractionation and characterization of xylan rich extracts from birch
- Polyoxometalate (POM) oxidation of lignin model compounds
- Pyrolytic cleavage mechanisms of lignin-ether linkages: A study on p-substituted dimers and trimers
- Polysaccharide degradation in waterlogged oak wood from the ancient warship Vasa
- Degradation of polyethylene glycol and hemicellulose in the Vasa
- Selection criteria of Eucalyptus globulus Labill. for production of chemithermomechanical pulps (CTMP)
- The effect of (induced) dislocations on the tensile properties of individual Norway spruce fibres
- Mode I and Mode II fracture toughness of densified Sitka spruce fabricated in an airtight atmosphere with high-temperature steam
- Characteristic properties of embedding strength for the nailing of the gonfolo rose (Qualea rosea Aubl.)
- Adhesive penetration of wood cell walls investigated by scanning thermal microscopy (SThM)
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- Decay resistance of wood treated with amino-silicone compounds
- Hydrothermal treatment of mixed preservative-treated wood waste
- Variation of tracheid length within annual rings of Scots pine and Norway spruce
