Title: Short-term responses of overstory and understory vegetation to thinning treatments: a tale of two studies
Author: Puettmann, Klaus J.; Dodson, Erich Kyle; Ares, Adrian; Berger, Carrie A.;
Source: In: Anderson, P.D.; Ronnenberg, K.L., eds. Density management in the 21st century: west side story. Gen. Tech. Rep. PNW-GTR-880. Portland, OR: US Department of Agriculture, Forest Service, Pacific Northwest Research Station: 44-58.
Publication Series: General Technical Report (GTR)
Description: The Density Management Study and Young Stand Th inning and Diversity Study were initiated to investigate whether alternative thinning treatments can accelerate the development of forests toward late-successional structures. An overview of overstory and understory vegetation responses indicates that the magnitude and direction of thinning eff ects initially varied among structural stand components. Average crown length, diameter growth, and seedling and sapling density increased rapidly after thinning. However, diameter growth of the largest trees was less responsive to thinning, at least in the short term. Overall shrub cover was initially reduced by thinning, which was likely a consequence of harvesting damage. Th inning tended to increase overall species diversity by benefi tting early-successional species, and had little infl uence on late-successional species diversity. This trend appeared to reverse itself quickly, as early-seral vegetation declined within a decade. It appears that silvicultural treatments may best target specific stand structural components, e.g., large trees, crown length, or an understory shrub layer, rather than attempting to achieve all late-successional structural elements simultaneously. Increasing variability at smaller and larger spatial scales may be an option to achieve multiple management goals.
Keywords: Thinning, late-successional habitat, Douglas-fir, overstory, understory vegetation, regeneration.
- 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.
- You may send email to email@example.com to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
XML: View XML
Puettmann, Klaus J.; Dodson, Erich K.; Ares, Adrian; Berger, Carrie A. 2013. Short-term responses of overstory and understory vegetation to thinning treatments: a tale of two studies. In: Anderson, P.D.; Ronnenberg, K.L., eds. Density management in the 21st century: west side story. Gen. Tech. Rep. PNW-GTR-880. Portland, OR: US Department of Agriculture, Forest Service, Pacific Northwest Research Station: 44-58.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility