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


    Energy values, BTU's (British thermal units) per ovendry pound, were determined for whole-tree and crown materials from western hemlock (Tsuga heterophylla (Raf.) Sarg.), coast Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii), and western redcedar (Thuja plicata Donn ex D. Don). Samples were collected from small-diameter stands in northwest Washington where whole-tree harvesting is underway. Samples of crown material representing each diameter class were composited into a single sample for each species. The whole-tree sample, collected from a van being loaded with hog fuel from the whole-tree chipping operation, was a mix of species and diameters. Crowns had a higher Btu value than did whole-tree material. With the exception of redcedar, energy values for crown material is higher than commonly used values for wood alone. Results of this study indicate that use of wood energy values may underestimate the product potential of hog fuel created from whole-tree chipping.

    Publication Notes

    • You may send email to 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.


    Howard, James O. 1988. Energy values for whole trees and crowns of selected species. Res. Note. PNW-RN-480. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p


    Google Scholar


    Energy, whole-tree harvesting, hog fuel, wood energy, western Washington, western hemlock, Douglas-fir, western redcedar

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page