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 (701 KB)

Title: Estimating the quadratic mean diameter of fine woody debris for forest type groups of the United States

Author: Woodall, Christopher W.; Monleon, Vicente J.;

Date: 2009

Source: In: McRoberts, Ronald E.; Reams, Gregory A.; Van Deusen, Paul C.; McWilliams, William H., eds. Proceedings of the eighth annual forest inventory and analysis symposium; 2006 October 16-19; Monterey, CA. Gen. Tech. Report WO-79. Washington, DC: U.S. Department of Agriculture, Forest Service. 185-190.

Publication Series: General Technical Report (GTR)

   Note: This article is part of a larger document. View the larger document

Description: The Forest Inventory and Analysis program of the Forest Service, U.S. Department of Agriculture conducts a national inventory of fine woody debris (FWD); however, the sampling protocols involve tallying only the number of FWD pieces by size class that intersect a sampling transect with no measure of actual size. The line intersect estimator used with those samples requires a measurement of the quadratic mean diameter (QMD). Published information regarding appropriate QMDs by FWD diameter class by species or forest types across the United States is lacking. Thus, the objective of this study is to employ a technique known as the graphical estimation (GE) method for estimating FWD QMDs for major forest types across the United States. Results indicate that the GE method, along with adaptations proposed in this study, allows for rapid estimation of FWD QMDs without additional fieldwork. The value (-1.81) of the scaling power function between the number of woody pieces by size class closely matches published scaling values (-2.00) between bole and fine branch diameters. Validation results indicate that estimates of QMD from the GE method differ substantially from published QMDs; however, published QMD results differ from one another to an even greater extent. Given the mixing of FWD from a diversity of tree and shrub species in the Nation's forests, this study concludes that a set of general QMDs for FWD across the United States should be used in the absence of empirically derived or power function-based QMD estimates.

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.
  • This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
  • Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.

XML: View XML

Citation:


Woodall, Christopher W.; Monleon, Vicente J. 2009. Estimating the quadratic mean diameter of fine woody debris for forest type groups of the United States. In: McRoberts, Ronald E.; Reams, Gregory A.; Van Deusen, Paul C.; McWilliams, William H., eds. Proceedings of the eighth annual forest inventory and analysis symposium; 2006 October 16-19; Monterey, CA. Gen. Tech. Report WO-79. Washington, DC: U.S. Department of Agriculture, Forest Service. 185-190.

 


 [ 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.