Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): David W. Vahey; J. Y. Zhu; C. Tim Scott
    Date: 2007
    Source: Wood and fiber science. Vol. 39, no. 3 (2007): pages 462-471.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (274 KB)

    Description

    Interest in the commercial value of small-diameter timber has led to testing core samples with SilviScan to characterize density and transverse fiber dimensions. Data showed that latewood density and tracheid diameter in suppressed-growth material can vary spatially on a scale comparable to the 50-_m resolution of the instrument used in our testing. An optical imaging method called Ring Profiler was developed to determine what effect SilviScan’s resolution had on the measurements. A single suppressed-growth specimen of Douglas-fir was used to develop the method. Ring Profiler measurements of the specimen showed that SilviScan overestimated latewood tracheid radial diameters by 59% in growth rings averaging 200-_m width. In those same growth rings, SilviScan latewood density was found to be 19% too low. In all growth rings measured by Ring Profiler, latewood wall thicknesses were anisotropic. Radial and tangential values averaged 13% less than the isotropic wall thickness calculated from SilviScan data. Ring Profiler density measurement from binarized images of wood cross-sections was found to correlate well with SilviScan X-ray density (r-squared _ 0.907); however, better images and an objective method for thresholding are needed for accuracy over a large sample space. With these improvements and automated scanning of samples, Ring Profiler could be an attractive, inexpensive complement to SilviScan.

    Publication Notes

    • 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.

    Citation

    Vahey, David W.; Zhu, J. Y.; Scott, C. Tim. 2007. Wood density and anatomical properties in suppressed-growth trees : comparison of two methods. Wood and fiber science. Vol. 39, no. 3 (2007): pages 462-471.

    Keywords

    SilviScan, tracheid, density, diameter, wall thickness, anisotropy, image analysis, resolution, suppressed growth, small diameter, thinnings, pulp, pulping, Douglas fir, wood anatomy, wood density, stand density, pulpwood, ring profiler, small timbers, utilization, smallwood, small-diameter timber, thinnings

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/29255