Preliminary site index curves for white birch, trembling aspen, and balsam fir in New Brunswick
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Date
1984
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University of New Brunswick
Abstract
Site index curves, which represent the relationship between total tree height and age, are the most common measure used to predict potential productivity of an area. The two methods currently used for constructing site index curves result in either anamorphic or polymorphic curves. Preliminary anamorphic site index curves were constructed for white birch (Betula papyrifera Marsh.), trembling aspen (Populus tremuloides Michx) and balsam fir (Abies balsamea (L.) Mill.) using a non-linear least-squares regression procedure. Because of the inherent assumptions that.anamorphic curves are based on, possible bias estimates of site index can occur. A thorough understanding of site index curves is necessary for their correct use. It is recommended that polymorphic curves be constructed in the near future as they are generally more accurate than anamorphic curves.