Prediction equations for biomass of white spruce (Piceaglauca (Moench) Voss) were developed for 115 sample trees using the allometric models Y = AD B and Y = AD B H C , where Y is mass, D is diameter at breast height, and H is total height. The addition of height to the model reduced the S y •x for all estimates except that for biomass of branches and needles. Comparison of results to other estimation equations developed in eastern Canada showed that biomass estimates were variable. Variations in stand structure and age between natural and plantation-grown trees are possible reasons for these differences.
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Harding et al. (1985) studied this question.