Estimating coefficients of base-age-invariant site index equations

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Abstract
Remeasurement height data used in this study were collected from plantations of loblolly pine (Pinustaeda L.) established in the Southwide Pine Seed Source Study. Three different methods for estimating coefficients of five base-age-invariant site index models were evaluated. The first method involves obtaining coefficients from either a height–age equation or a differential equation. Coefficients from the remaining two methods were estimated from a height growth equation (difference equation) of which the dependent variable is either stand height or logarithm of height. Statistics used in the evaluation were mean of the differences (between the observed and predicted stand heights), mean of the absolute differences, and square root of mean squared error. Results indicated that in most cases, coefficients of the site index models evaluated should be obtained from the height growth equation.

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