Distributions of tracheid cross-sectional dimensions in different parts of Norway spruce stems

Mikko Havimo, Juha Rikala, Jari Sirviö, Marketta Sipi

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

Distributions of three cross-sectional dimensions: radial and tangential tracheid width, and cell wall thickness in different timber assortments of Norway spruce were investigated. Wood samples from a mature stand were measured with SilviScan. In the analysis, virtual trees were constructed from measurement data, and divided into three assortments: whole stem, top pulpwood and sawmill chips. Average values and distributions of the properties were calculated for all assortments, and distributions divided into earlywood and latewood across the whole tree assortment. There was considerable variation within latewood in all three cross-sectional dimensions, but variation in earlywood was slight in radial width and cell wall thickness. In earlywood, tangential tracheid width showed considerable internal variation, and the difference between earlywood and latewood in tangential width was small. Within-assortment variation of all three properties was larger than between assortments. We may conclude that only a moderate difference in pulp properties can be achieved by sorting raw material into sawmill chips and top pulpwood. Pulp fractionation into earlywood and latewood seems to be a more efficient method, since it gives classes with small within-class variation and distinct average properties. However, it should be kept in mind that the results are valid only in mature stands, where growth rate variation and juvenile wood content are small.
Original languageEnglish
Pages (from-to)89-99
Number of pages11
JournalSilva Fennica
Volume42
Issue number1
DOIs
Publication statusPublished - 2008
MoE publication typeNot Eligible

Fingerprint

earlywood
latewood
Picea abies
stem
stems
pulpwood
sawmills
pulp
sorting
cell walls
timber
juvenile wood
fractionation
raw materials
distribution
sampling

Keywords

  • thickness
  • tracheids
  • kasvianatomia
  • puu
  • tangential with
  • radial width
  • growth rings
  • cell walls
  • trakeidit
  • ominaisuudet
  • kuusi
  • vuosilustot
  • Picea abies
  • dimensions

Cite this

Havimo, Mikko ; Rikala, Juha ; Sirviö, Jari ; Sipi, Marketta. / Distributions of tracheid cross-sectional dimensions in different parts of Norway spruce stems. In: Silva Fennica. 2008 ; Vol. 42, No. 1. pp. 89-99.
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abstract = "Distributions of three cross-sectional dimensions: radial and tangential tracheid width, and cell wall thickness in different timber assortments of Norway spruce were investigated. Wood samples from a mature stand were measured with SilviScan. In the analysis, virtual trees were constructed from measurement data, and divided into three assortments: whole stem, top pulpwood and sawmill chips. Average values and distributions of the properties were calculated for all assortments, and distributions divided into earlywood and latewood across the whole tree assortment. There was considerable variation within latewood in all three cross-sectional dimensions, but variation in earlywood was slight in radial width and cell wall thickness. In earlywood, tangential tracheid width showed considerable internal variation, and the difference between earlywood and latewood in tangential width was small. Within-assortment variation of all three properties was larger than between assortments. We may conclude that only a moderate difference in pulp properties can be achieved by sorting raw material into sawmill chips and top pulpwood. Pulp fractionation into earlywood and latewood seems to be a more efficient method, since it gives classes with small within-class variation and distinct average properties. However, it should be kept in mind that the results are valid only in mature stands, where growth rate variation and juvenile wood content are small.",
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Distributions of tracheid cross-sectional dimensions in different parts of Norway spruce stems. / Havimo, Mikko; Rikala, Juha; Sirviö, Jari; Sipi, Marketta.

In: Silva Fennica, Vol. 42, No. 1, 2008, p. 89-99.

Research output: Contribution to journalArticleScientificpeer-review

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N2 - Distributions of three cross-sectional dimensions: radial and tangential tracheid width, and cell wall thickness in different timber assortments of Norway spruce were investigated. Wood samples from a mature stand were measured with SilviScan. In the analysis, virtual trees were constructed from measurement data, and divided into three assortments: whole stem, top pulpwood and sawmill chips. Average values and distributions of the properties were calculated for all assortments, and distributions divided into earlywood and latewood across the whole tree assortment. There was considerable variation within latewood in all three cross-sectional dimensions, but variation in earlywood was slight in radial width and cell wall thickness. In earlywood, tangential tracheid width showed considerable internal variation, and the difference between earlywood and latewood in tangential width was small. Within-assortment variation of all three properties was larger than between assortments. We may conclude that only a moderate difference in pulp properties can be achieved by sorting raw material into sawmill chips and top pulpwood. Pulp fractionation into earlywood and latewood seems to be a more efficient method, since it gives classes with small within-class variation and distinct average properties. However, it should be kept in mind that the results are valid only in mature stands, where growth rate variation and juvenile wood content are small.

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