Title: Modeling the effect of initial planting density on within tree variation of stiffness in loblolly pine
Author: Antony, Finto; Schimleck, Laurence R.; Jordan, Lewis; Daniels, Richard F.; Clark, Alex III;
Source: Annals of Forest Science 69(5):641-650
Publication Series: Scientific Journal (JRNL)
Description: Context Modulus of elasticity (MOE) is an important mechanical property determining the end-use and value of loblolly pine (Pinus taeda L.) lumber. Aim In this study, a model was developed to predict the within tree variation of MOE, from pith-to-bark and stumpto- tip, using data collected from a 21-year-old unthinned stand where trees were planted under seven initial stand density levels (746–2,243 trees/hectare). Methods The study was laid out in a randomized complete block design, with seven levels of initial planting density, replicated three times. Seven trees were destructively sampled from each plot, and bolts were cut from each tree at heights of 2.4, 7.3, and 12.2 m. Static bending samples (of dimension 2.5×2.5×40.6 cm) representing pith-to-bark variation were cut from each bolt and MOE measured. A three-parameter logistic function was used to model the pith-to-bark variation in stiffness with distance from pith as an explanatory variable. Results Based on the final fitted model, it was found that the asymptotic parameter (maximum outerwood MOE=13.48 GPa) was not influenced by sampling height, initial planting density, and stem slenderness. However, the inflection and scale parameters were significantly influenced by these variables. Conclusions In summary, we found that initial planting density had a significant influence on the amount of corewood produced with higher initial planting densities producing a lower proportion of corewood as indicated by a linear decrease in inflection point with an increase in planting density.
Keywords: Loblolly pine, Corewood, Outerwood, Stiffness, Pinus taeda L.
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Antony, Finto; Schimleck, Laurence R.; Jordan, Lewis; Daniels, Richard F.; Clark, Alex, III 2012. Modeling the effect of initial planting density on within tree variation of stiffness in loblolly pine. Annals of Forest Science 69(5):641-650.
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