Equations for predicting green weight of loblolly pine trees in the South

Abstract

Equations are needed to estimate the green weight of loblolly pine (Pinus taeda L.) trees across the commercial range in the South. Thus, a study was conducted to derive models for predicting green weight of total and merchantable bole portions. Equations were fitted to sectional tree stem observations where a serial correlation was discerned among the data, indicating an intratree relationship. Linear equations utilizing a correction for serial correlation did not outperform an uncorrected nonlinear equation form. Three data sets were combined, and regionwide prediction models for total green weight, green weight to any upper merchantable diameter, and green weight to any upper merchantable height were developed for loblolly pine trees. Implicit taper functions were derived from the green weight prediction equations to enable estimation of upper stem diameters and heights.