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Notes: Formulated Site Index Curves for Major Timber Species in Ontario

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Extension of the Richards growth model provides an excellent description of Plonski's site index curves for the major timber species of Ontario. Equations expressing height as a function of age and site index were derived based on a nonlinear regression analysis and least-squares approximation techniques. These equations facilitate computer processing and their first partial derivatives with respect to age provide approximate annual height growth estimates useful in the absence of localized growth data. The growth model employed here should be useful in describing site-index curves of other species, particularly those which have sigmoid and doubly asymptotic and polymorphic height-growth patterns. Forest Sci. 20:143-144.
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Keywords: Site productivity; biological growth models

Document Type: Miscellaneous

Affiliations: Research Scientist, Department of the Environment, Canadian Forestry Service, Great Lakes Forest Research Centre, Sault Ste. Marie, Ontario

Publication date: 01 June 1974

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