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): Barbara L. Gartner; G.R. Johnson
    Date: 2006
    Source: Canadian Journal of Forest Research. 36: 2351-2356
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (670 KB)


    Stem sinuosity is a highly visible stem-form trait in the leaders of fast-growing Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) trees, yet its cause is unknown. We tested the hypotheses that sinuous stems have longer expanses of primary growth than nonsinuous stems (putting the leader at higher risk for curvature, induction of compression wood formation. and possibly overcorrection) and higher leader angle using 4- to 5-year-old saplings in raised beds. As hypothesized, sinuous stems had longer expanses of primary growth than did nonsinuous stems (13.5 vs. 12.3 cm, respectively). However, for the dates fox which growth length/day, primary growth, secondary growth, and total growth) differed significantly among sinuosity class. sinuosity class only explained 15%-21% of the variation in growth rate. There were no significant differences in leader angle for saplings of the three sinuosity classes. Contingency tables indicated some consistency in the category of sinuosity to which we assigned the stems in 2001 and 2002 (χ2 = 11.2, p < 0.004). When we used a more quantitative measure, the ratio of stem length/stem distance there was a tendency toward a significant relationship between the two years (r = 0.272, p = 0.0893). These data suggest that. counter to expectation, the rate of stem growth was not a large factor in determining whether leaders become sinuous for this population of trees.

    Publication Notes

    • Visit PNW's Publication Request Page to request a hard copy of this publication.
    • 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.


    Gartner, Barbara L.; Johnson, G.R. 2006. Is long primary growth associated with stem sinuosity in Douglas-fir?. Canadian Journal of Forest Research. 36: 2351-2356

    Related Search

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