The influence of tree spacing on Sitka spruce growth.

  • W.H. Jack Formerly Research Officer, Forestry Division, Ministry of Agriculture, Belfast.
Keywords: Spacing, tree size, basal area, branchiness, thinning, Sitka spruce, Picea sitchensis, form factor, form height, growth pattern, silviculture, tree growth.


In spite of a long history of forestry practice there is surprisingly little known about many of the fundamental relationships between tree growth and the growing space per tree. In Northern Ireland Sitka spruce is the most important single species, but it is often plan~ed on sites where ground conditions make thinning extraction, without causing damage, a very costly operation. There is accordingly very considerable interest in growth development without thinning for this species with particular regard for the effects on individual tree size and gross increment...
How to Cite
Jack, W. (1971) “The influence of tree spacing on Sitka spruce growth.”, Irish Forestry. Available at: (Accessed: 29May2024).