Evaluation of Two Methods for Cubic-Volume Prediction of Loblolly Pine to Any Merchantable Limit

Abstract

Abstract This study compares two methods of estimating merchantable volumes to specified top diameter or height limits. The prediction models evaluated were (1) volume ratio models that give the ratios of merchantable to total volume, and (2) taper equations that when integrated provide volume estimates of any segment of the bole. Data from plantations and natural stands of loblolly pine were used to compare the models for ability to predict merchantable volumes. Additional evaluations were made to compare taper equations. Results showed that the choice of the model depends on the objective. Two sets of volume ratio models are recommended for predicting merchantable volumes, whereas a new taper equation is found to estimate consistently well both volumes and diameters. Forest Sci. 26:71-80.