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Northern Research Station
11 Campus Blvd., Suite 200
Newtown Square, PA 19073
(610) 557-4017
(610) 557-4132 TTY/TDD

Sustaining Forests

Coarse Woody Debris

[photo:] Forester using the point relascope method for sampling coarse woody debris.Research Issue

A proportion of the carbon in forest ecosystems is contained in coarse woody debris on the forest floor. Estimating the carbon stock and other attributes of coarse woody debris can be time consuming and error-prone. New methods for field sampling of coarse woody debris are needed for efficient estimation of the carbon stock in this forest pool.

Our Research

Several new techniques for field sampling of coarse woody debris have been developed by our group. These methods are efficient in terms of both field time and statistical precision. We continue to field test and validate these methods by simulation. In addition, we continue to extend these new methods to other attributes, and develop new methods.

Expected Outcomes

Field methods for sampling coarse woody debris that are useful to both researchers and practitioners. Published research papers, and workshops for practicing foresters.

Valentine H.T.,  J.H. Gove, M.J. Ducey, T.G. Gregoire and M.S. Williams. 2008. Estimating the carbon in coarse woody debris with perpendicular distance sampling. (in prep).

Research Results

Publications

Ducey M.J., M.S. Williams, and J.H. Gove. 2008. Distance limited perpendicular distance sampling for coarse woody material: theory and field results. Environmental and Ecological Statistics (in press).

Ducey, M.J., M.S. Williams, J.H. Gove, and H.T. Valentine. 2008. Simultaneous unbiased estimates of multiple downed wood attributes in perpendicular distance sampling. Canadian Journal of Forest Research. 38: 2044-2051.

Gregoire, T.G. and H.T. Valentine. 2008.  Sampling Strategies for Natural Resources and the Environment.  Chapman and Hall/CRC, Boca Raton. 496 pp.

Valentine, Harry T.; Ducey, Mark J.; Gove, Jeffrey H.; Lanz, Adrian; Affleck, David L.R. 2006. Corrections for Cluster-Plot Slop. Forest Science. 52(1): 55-66

Gove, Jeffrey H.; Williams, Michael S.; Ståhl, Göran; Ducey, Mark J. 2005. Critical point relascope sampling for unbiased volume estimation of downed coarse woody debris. Forestry. 78(4): 417-431.

Williams, Michael S.; Ducey, Mark J.; Gove, Jeffrey H. 2005. Assessing surface area of coarse woody debris with line intersect and perpendicular distance sampling. Canadian Journal of Forest Research. 35: 949-960.

Williams, Michael S.; Valentine, Harry T.; Gove, Jeffrey H.; Ducey, Mark J. 2005. Additional results for perpendicular distance sampling. Canadian Journal of Forest Research. 35: 961-966.

Ducey, Mark J.; Gove, Jeffrey H.; Valentine, Harry T. 2004. A walkthrough solution to the boundary overlap problem. Forest Science. 50(4): 427-435.

Jordan, G. J.; Ducey, M. J.; Gove, J. H. 2004. Comparing line-intersect, fixed-area, and point relascope sampling for dead and downed coarse woody material in a managed northern hardwood forest. Canadian Journal of Forest Research. 34: 1766-1775

Williams, M.S., J.H. Gove. 2003. Perpendicular distance sampling: An alternative method for sampling downed coarse woody debris. Canadian Journal of Forest Research. 33:1564-1579.

Brissette, John C.; Mark J. Ducey; Jeffrey H. Gove. 2003. A field test of point relascope sampling of down coarse woody material in managed stands in the Acadian Forest. Journal of the Torrey Botanical Society 130(2), p.79-88.

Gove, J.H., M.J. Ducey, H.T. Valentine. 2002. Multistage point relascope and randomized branch sampling for downed coarse woody debris estimation. Forest Ecology and Management 155:153-162.

Ståhl, G., A. Ringvall, J.H. Gove, M.J. Ducey. 2002. Correction for slope in point and transect relascope sampling of downed coarse woody debris. Forest Science 48(1):85-92.

Gove, Jeffrey H. 2001. Sampling down coarse woody debris with an angle gauge. Page 21-25 in Bennett, Karen P. (compiler). 2001 Proceedings from Workshop series on Forest Measurements for Natural Resource Professionals. Held Oct. 12,2001. Fox State Forest, NH. University of New Hampshire Cooperative Extension. 58 pp.

Gove, J.H., M.J. Ducey, G. Ståhl and A. Ringvall. 2001. Point relascope sampling: A new way to assess downed coarse woody debris. Journal of Forestry 99(4):4-11.

Ringvall, A., G. Ståhl, V. Teichmann, J.H. Gove, M.J. Ducey. 2001. Two-phase approaches to point and transect relascope sampling of downed logs. Canadian Journal of Forest Research 31:971-977.

Valentine, H.T., J.H. Gove and T.G. Gregoire. 2001. Monte Carlo approaches to sampling forested tracts with lines or points. Canadian Journal of Forest Research 31(8):1410-1424.

Gove, J.H., A. Ringvall, G. Ståhl and M.J. Ducey. 1999. Point relascope sampling of downed coarse woody debris. Canadian Journal of Forest Research 29(11):1718-1726.

Workshop

Sampling and Management of Down Coarse Woody Debris in New England

Research Participants

Principal Investigators

  • J.H. Gove, US Forest Service- Northern Research Station Research Forester
  • H.T. Valentine, US Forest Service- Northern Research Station Research Forester

Research Partners

  • Mark J. Ducey, University of New Hampshire
  • Timothy G. Gregoire, Yale University
  • Göran Ståhl, Swedish University of Agricultural Sciences, Umeå
  • A. Ringvall, Swedish University of Agricultural Sciences, Umeå
  • Michael S. Williams, Food Safety Inspection Service, Fort Collins, CO

Last Modified: 04/22/2009