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Forestry Advance Access originally published online on July 1, 2005
Forestry 2005 78(4):417-431; doi:10.1093/forestry/cpi040
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© Institute of Chartered Foresters, 2005. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Critical point relascope sampling for unbiased volume estimation of downed coarse woody debris

Jeffrey H. Gove1,*, Michael S. Williams2, Göran Ståhl3 and Mark J. Ducey4

1 Northeastern Research Station, USDA Forest Service, 271 Mast Road, PO Box 640, Durham, NH 03824, USA
2 Rocky Mountain Research Station, USDA Forest Service, 2150 A Centre Avenue, Suite 361, Fort Collins, CO 80526, USA
3 Department of Forest Resource Management and Geomatics, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
4 Department of Natural Resources, 221 James Hall, University of New Hampshire, Durham, NH 03824, USA

* Corresponding author. E-mail: jgove{at}fs.fed.us

Critical point relascope sampling is developed and shown to be design-unbiased for the estimation of log volume when used with point relascope sampling for downed coarse woody debris. The method is closely related to critical height sampling for standing trees when trees are first sampled with a wedge prism. Three alternative protocols for determining the critical sampling points on a log are presented and simulations are employed to suggest the most efficient protocol to use in practice.

Received 22 November 2004.
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