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Forestry 1962 33(1):22-26; doi:10.1093/forestry/33.1.22
© 1962 by Institute of Chartered Foresters
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Some Ring-width Patterns in Sitka Spruce Timber from North America

J. M. DINWOODIE

Department of Forestry, University of Aberdeen 1

Variations in ring-width pattern of Sitka spruce (Picea sitchensis Carr.) through most of its life in its natural habitat are demonstrated from photographs of ten crosssections. It is suggested that in addition to the annual fluctuations in ring-width due to climatic variation, the tree in the natural forest is subject to periodic suppression and release and that it has considerable powers of recovery; in plantations, therefore, Sitka spruce should respond to thinnings made even late in the rotation.


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