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
Help
 

GeoTreesearch


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

(1.45 MB bytes)

Title: Ecological effects of variable retention harvests in the northwestern United States: the DEMO study.

Author: Aubry, Keith B.; Halpern, Charles B.; Maguire, Douglas A.

Date: 2004

Source: Forest Snow and Landscape Research. 78(1/2): 119-137.

Publication Series: Not categorized

Description: The retention of trees in harvest units is an integral part of forest management practices on federal lands in the northwestern United States (U.S.), yet the ecological benefits that result from various levels or patterns of retained trees remain speculative. Large scale and long term silviculture experiments are needed to evaluate the effects of alternative forest management strategies on biological diversity, yet they are rarely undertaken due to the substantial commitments of time and resources required. The Demonstration of Ecosystem Management Options (DEMO) study was initiated by U.S. Congressional mandate in 1993 and is unique in the northwestern U.S. in its geographic scope, experimental design, and collaboration between research and management. The experimental design consists of six harvest treatments, each 13 ha in size, replicated at six locations (blocks). Treatments represent strong contrasts in the level (15-100%) and pattern (dispersed or aggregated) of retention in mature Douglas fir forests. Data were collected from 1994 to 1996 prior to harvest, experimental harvests were implemented in 1997 and 1998, and initial post treatment sampling was completed in 2001. A variety of ecological responses were measured and public perceptions of visual quality were evaluated. We discuss the objectives and experimental and sampling designs for the DEMO study, and present brief summaries of the recalls of component studies. Early results have provided important insights into response mechanisms, but the most significant and useful results will be obtained as experimental stands reach maturity in the coming decades.

Keywords: Aggregated retention, biological diversity, dispersed retention, ecological responses, silviculture, forest structure, variable retention harvest, visual quality.

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.

XML: View XML

Citation:


Aubry, Keith B.; Halpern, Charles B.; Maguire, Douglas A. 2004. Ecological effects of variable retention harvests in the northwestern United States: the DEMO study. Forest Snow and Landscape Research. 78(1/2): 119-137.

 


 [ 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.