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    Author(s): Charles Essien; Qingzheng Cheng; Brian K. Via; Edward F. Loewenstein; Xiping Wang
    Date: 2016
    Source: BioResources
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (960.0 KB)

    Description

    There is currently a request from landowners in southeastern USA to provide a non-destructive tool that can differentiate the quality between stands of 25 and 30 years of age subjected to different thinning treatments. A typical site with various thinning regimes was used to vary the wood quality and to determine whether acoustics had the ability to seperate for differences at a given age and local geography. A stand at age 29 with three different spacing (prior thinning) levels was chosen. Three hundred trees (100 per treatment) were randomly selected and acoustically tested for sound velocity using the Time-of-Flight (ToF) method for unthinned, thinned, and twice-thinned stands, respectively. The key finding of the study was that the estimated stiffness of the previously thinned treatments was actually greater than that of the unthinned group, despite having diameters as much as 28% larger. During a forest cruise, knowing that a higher-diameter stand is similar or higher in stiffness could raise the dollar value and harvest property.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Essien, Charles; Cheng, Qingzheng; Via, Brian K.; Loewenstein, Edward F.; Wang, Xiping. 2016. An acoustics operations study for Loblolly pine (Pinus taeda) standing saw timber with different thinning history. BioResources. 11(3): 7512-7521.

    Keywords

    Acoustic velocity, Stiffness, Thinning regimes, Loblolly pine

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https://www.fs.usda.gov/treesearch/pubs/52617