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Forestry 1977 50(2):139-142; doi:10.1093/forestry/50.2.139
© 1977 by Institute of Chartered Foresters
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The Use of Stem Rings to Determine Annual Height Increments in Norway Spruce

J. S. MURRAY and S. DIAMANDIS

Department of Forestry, University of Aberdeen St. Machar Drive, Old Aberdeen. AB9 2UU

Whorls of branches were found to be unreliable as indicators of nodes in Norway spruce (P. abies (L.) Karst.) Nodal diaphragms in the pith are shown to be very reliable and precise indicators of nodes but their use in measuring annual height increments is not practicable except on a small scale or on young material.

Stem rings on Norway spruce are described and are shown to originate as depressions on the current years' shoots, associated with the bud scales. They persist on stems for at least twenty-eight years. They can be used as precise indicators of nodes and offer an easy and reliable method of measuring annual height increments.


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