Juvenile wood in Irish grown Sitka spruce and the impact of rotation length.

  • Áine Ní Dhubháin UCD School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland.
  • Donal Magner Secretary Wood Marketing Federation, 1 Heatherbrook, Marlton Road, Wicklow.
  • Maarten Nieuwenhuis UCD School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland.
Keywords: Juvenile wood, wood density, rotation length, timber quality, Sitka spruce.

Abstract

The impact of rotation length on the level of juvenile wood in Sitka spruce (Picea sitchensis (Bong.) Carr.) in Ireland was investigated. Mean density was 539 kg/m3 at the first growth ring, rising to 558 kg/m3 in the second, and thereafter declining to 384 kg/m3. Demarcation between juvenile and mature wood was assumed to occur at growth ring 14, where the mean density was lowest. The proportion of juvenile wood was then estimated for Sitka spruce of yield class 24, and was found to substantially decline with age, from 30.3% at age 30 to 13.7% by age 46 (tabulated age of maximum mean annual increment), The implications of the results for rotation length policy are discussed.
Published
2006-11-01
How to Cite
Ní Dhubháin, Áine, Magner, D., & Nieuwenhuis, M. (2006). Juvenile wood in Irish grown Sitka spruce and the impact of rotation length. Irish Forestry. Retrieved from https://journal.societyofirishforesters.ie/index.php/forestry/article/view/9978
Section
Articles