Segmented polynomial taper equation incorporating years since thinning for loblolly pine plantationsThis article is part of a larger document. View the larger document here.
Data from 108 trees felled from 16 loblolly pine stands owned by Temple-Inland Forest Products Corp. were used to determine effects of years since thinning (YST) on stem taper using the Max–Burkhart type segmented polynomial taper model. Sample tree YST ranged from two to nine years prior to destructive sampling. In an effort to equalize sample sizes, tree data were classified into three groups: 2 and 3, 4 and 5, and 6 to 9 years since thinning. A modified Max-Burkhart segmented taper model was fitted to each of the three YST categories in order to detect any trends in the coefficients. Multiple coefficients were then expressed as functions of YST. The resulting three-segment equation included the independent variable of YST. The resulting taper equation predicts expected changes in shape of loblolly pine trees following thinning activities.