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Forestry 1979 52(2):177-185; doi:10.1093/forestry/52.2.177
© 1979 by Institute of Chartered Foresters
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The Use of a Breast-height Core for Estimating Selected Whole-tree Properties of Sitka Spruce

J.D. BRAZIER and R.S. HOWELL

Building Research Establishment, Princes Risborough Laboratory
Forestry Commission Research Station Wrecclesham, Farnham, Surrey

The use of a breast-height core for estimating wood density of the whole stem has been examined for British-grown Sitka spruce. Regression equations have been derived for stem lengths to 7 cm and 18 cm top diameter over bark and the precision of the estimates determined for both between- and within-site comparisons.

The breast-height sampling technique is considered to be of practical value for demonstrating differences of density of 15 kg m–3 or more, depending on the number of samples taken, when a comparison is made between sites; when a comparison is made within a site, the results show that the method can be used to demonstrate differences of 8 kg m–3 or more. It clearly offers scope for the nondestructive examination of the effect of silvicultural operations on wood density and yields of wood substance.


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