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): B. R. Stam; J. C. Malechek; D. L. Bartos; J. E. Browns; E. B. Godfrey
    Date: 2008
    Source: Rangeland Ecology and Management. 61(1): 93-97.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (154.43 KB)


    Conifers (Picea and Abies spp.) have replaced aspen (Populus tremuloides Michx.) over much of aspen's historic range in the western United States. We measured the impact of this change upon the production of understory vegetation potentially useful as forage for livestock and wildlife on two southern Utah national forests. A negative exponential relationship between conifer cover and understory biomass was demonstrated as log (biomass)=6.25-0.03787(% conifer), adjusted R2=0.57. Understory production in aspen stands begins to decline under very low levels (10% to 20%) of conifer encroachment. Management implications include loss of forage production capability and wildlife habitat and potential overstocking of livestock grazing allotments if the associated loss of forage is not considered.

    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.


    Stam, B. R.; Malechek, J. C.; Bartos, D. L.; Browns, J. E.; Godfrey, E. B. 2008. Effect of conifer encroachment into aspen stands on understory biomass. Rangeland Ecology and Management. 61(1): 93-97.


    Picea, Abies, Populus tremuloides, understory, biomass, forage, Dixie National Forest, Fishlake National Forest, Utah

    Related Search

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