Abstract
A time series version of the Chapman-Richards function was used to develop a base-age invariant site index model for aspen ( Populus tremuloides Michx.) stands in north central Ontario. The model developed was compared with a base-age invariant and a base-age specific site index model. It proved to be superior to both for estimating the height at Age 40 years from all other heights, but somewhat less accurate than the base-age specific model for estimating all other heights from the height at Age 40 years. The time series version of the Chapman-Richards function described here may be used to develop base-age invariant site index models for other species.
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