Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (2.58 MB bytes)

Title: Historical and current stand structure in Douglas-fir and ponderosa pine forests.

Author: Ohlson, Peter; Schellhaas, Richard.;

Date: 2000

Source: Unpublished Report

Publication Series: Miscellaneous Publication

Description: A comparison of historic and current stand structure and species composition was made in Douglas-fir (Pseudotsuga menziesii) and ponderosa pine (Pinus ponderosa) forest series on the eastern slopes of the Cascade Mountains. We used tree ring analysis of 1,192 tree cores from the Okanogan National Forest to reconstruct historical tree diameter and inferred structural attributes during the past 100 years. Sampled stands currently have more trees per acre and more basal area than were found historically. Overall stand density has increased 307% for Douglas-fir, 81% for ponderosa pine and 138% for Engelmann spruce (Picea engelmannii). Western larch (Larix occidentalis) was the only tree species that decreased in density (-48%). Average basal area has also increased 81% above historical levels. Changes in stand density have not been uniform over the past 100 years. The maximum number of trees per acre for most of these stands occurred 40 to 50 years ago, which indicates a shift toward a stem exclusion stage of stand development in recent decades.

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.
  • You may send email to pnw_pnwpubs@fs.fed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

XML: View XML

Citation:


Ohlson, Peter; Schellhaas, Richard. 2000. Historical and current stand structure in Douglas-fir and ponderosa pine forests. Unpublished Report

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.