Skip to Main Content
Modeling the effect of initial planting density on within tree variation of stiffness in loblolly pineAuthor(s): Finto Antony; Laurence R. Schimleck; Lewis Jordan; Richard F. Daniels; Alex Clark
Source: Annals of Forest Science 69(5):641-650
Publication Series: Scientific Journal (JRNL)
Station: Southern Research Station
Download Publication (454.22 KB)
DescriptionContext 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.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationAntony, 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.
KeywordsLoblolly pine, Corewood, Outerwood, Stiffness, Pinus taeda L.
- Models for predicting specific gravity and ring width for loblolly pine from intensively managed plantations, and implications for wood utilization
- Modeling wood properties of planted Loblolly pine from pith to bark and stump to tip
- Regional variation in wood modulus of elasticity (stiffness) and modulus of rupture (strength) of planted loblolly pine in the United States
XML: View XML