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Revised Growth Intercept Models for Coastal Western Hemlock, Sitka Spruce, and Interior Spruce

Author(s) or contact(s): G.D. Nigh
Source: Research Branch
Subject: Growth and Yield
Series: Extension Note
Other details:  Published 1999. Hardcopy is available.


The original growth intercept models for Sitka spruce (Picea sitchensis [Bong.] Carr.), coastal western hemlock (Tsuga heterophylla [Raf.] Sarg.), and interior spruce-white spruce (Picea glauca [Moench] Voss), Engelmann spruce (P. engelmannii Parry), and their hybrids - are dated.

The original data, plus some additional data for interior spruce, were re-analyzed to incorporate new techniques into the models. The resulting models for Sitka spruce are more precise than the original models, although the revised models for western hemlock and interior spruce are slightly less precise. The advantages of the new techniques outweigh any loss of precision. The models for these species are upgraded to current standards and are consistent with models for other species.

Download Extension Note 37 PDF file (346 KB)

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Updated April 19, 2007