Compatible Volume and Taper Equation for East Texas Loblolly Pine

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The Max-Burkhart taper equation was used to develop compatible taper and volume equations for semi-intensive plantation grown loblolly pine (Pinus taeda L.) trees in east Texas. Semi-intensive plantations in east Texas are characterized by some form of mechanical site preparation, a burn, possibly chemical weed control, improved seedlings if planted after 1985, and possibly a mid-rotation thinning and/or fertilization. The equations in this study were compared to those of Lenhart et al. (1987) and Baldwin and Feduccia (1991) using independent data. The new equations ranked first (sum of ranks = 9) in terms of percent bias and percent SEE for inside-bark predictions of upper-stem diameters and cubic-foot volumes, while the Lenhart et al. (1987) ranked second (sum of ranks = 17) and Baldwin and Feduccia (1991) ranked third (sum of ranks = 22). For outside-bark predictions of volumes and diameters, Baldwin and Feduccia (1991) ranked first (sum of ranks = 12), while the new equations ranked a close second (sum of ranks = 13) and Lenhart et al. (1987) ranked third (sum of ranks = 20). We recommend using the new equations for loblolly pine trees up to 16 inches dbh and provide examples to illustrate their use.


References Coble, D.W., and K. Hilpp. 2006. Compatible cubic-foot stem volume and upper-stem diameter equations for semi-intensive plantation grown loblolly pine trees in east Texas. South. J. Appl. For. 30(3):132-141, which can be viewed here or by clicking the link above.



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