Scientists & Staff

Featured Publications & Products

• Makela, Annikki; Valentine, Harry T.; Helmisaari, Helja-Sisko. 2008. Optimal co-allocation of carbon and nitrogen in a forest stand at steady state. New Phytologist. 180: 114-123.
• Dewar, Roderick; Franklin, Oskar; Makela, Annikki; McMurtrie, Ross E.; Valentine, Harry T. 2009. Optimal function explains forest responses to global change. BioScience. 59(2): 127-139.
• Valentine, Harry T.; Affleck, David L. R.; Gregoire, Timothy G. 2009. Systematic sampling of discrete and continuous populations: sample selection and the choice of estimator. Canadian Journal of Forest Research. 39: 1061-1068.
• Makela, Annikki; Valentine, Harry T. 2006. Crown ratio influences allometric scaling in trees. Ecology. 87(12): 2967-2972.
• Valentine, Harry T.; Makela, Annikki; Makela, Annikki. 2005. Bridging process-based and empirical approaches to modeling tree growth. Tree Physiology. 25: 769-779.

Publications & Products

• Gove, Jeffrey H.; Ducey, Mark J.; Valentine, Harry T.; Williams, Michael S. 2013. A comprehensive comparison of perpendicular distance sampling methods for sampling downed coarse woody debris. Forestry. 86(1): 129-143.
• Valentine, Harry T.; Amateis, Ralph L.; Gove, Jeffrey H.; Makela, Annikki. 2013. Crown-rise and crown-length dynamics: applications to loblolly pine. Forestry. 86: 371-386.
• Gove, Jeffrey H.; Ducey, Mark J.; Valentine, Harry T.; Williams, Michael S. 2012. A distance limited method for sampling downed coarse woody debris. Forest Ecology and Management. 282: 53-62.
• Valentine, Harry T.; Makela, Annikki. 2012. Modeling forest stand dynamics from optimal balances of carbon and nitrogen. New Phytologist. 194: 961-971.
• Valentine, Harry T.; Makela, Annikki; Green, Edward J.; Amateis, Ralph L.; Makinen, Harri; Ducey, Mark J. 2012. Models relating stem growth to crown length dynamics: application to loblolly pine and Norway spruce. Trees. 26(1): 469-478.
• Ducey, Mark J.; Gove, Jeffrey H.; Valentine, Harry T. 2008. Simultaneous unbiased estimates of multiple downed wood attributes in perpendicular distance sampling. Canadian Journal of Forest Research. 38: 2044-2051.
• Ducey, Mark J.; Valentine, Harry T. 2008. Direct sampling for stand density index. Western Journal of Applied Forestry. 23(2): 78-82.
• Valentine, Harry T.; Gove, Jeffrey H.; Ducey, Mark J.; Gregoire, Timothy G.; Williams, Michael S. 2008. Estimating the carbon in coarse woody debris with perpendicular distance sampling. Chapter 6. In: Hoover, Coeli M., ed. Field measurements for forest carbon monitoring: A landscape-scale approach. New York, NY: Springer Science + Business Media: 73-87.
• Makela, Annikki; Valentine, Harry T. 2006. The quarter-power scaling model does not imply size-invariant hydraulic resistance in plants. Journal of Theoretical Biology. 243: 283-285.
• Valentine, Harry T.; Ducey, Mark J.; Gove, Jeffery H.; Lanz, Adrian; Affleck, David L.R. 2006. Corrections for Cluster-Plot Slop. Forest Science 52(1):55-66
• Affleck, David L. R.; Gregoire, Timothy G.; Valentine, Harry T. 2005. Edge Effects in Line Intersect Sampling With. Journal Agricultural, Biological, and Environmental Statistics 10:460-477
• Affleck, David L.R.; Gregoire, Timothy G.; Valentine, Harry T.; Valentine, Harry T. 2005. Design unbiased estimation in line intersect sampling using segmented transects. Environmental and Ecological Statistics. 12(1): 39-154.
• Gregoire, Timothy G.; Affleck, David L.R.; Valentine, Harry T. 2005. Conditioning inference on line orientation in line intersect sampling. In: Hobbelstad, K., ed. Forest inventory and planning in Nordic countries. Proceedings of SNS meeting; 2004 September 6-8; Sjusjoun, Norway. NIJOS report 09/05. [Place of publication unknown]: Norwegian Institute of Land Inventory: 121-129.
• Williams, Michael S.; Valentine, Harry T.; Gove, Jeffery H.; Ducey, Mark J.; Ducey, Mark J. 2005. Additional results for perpendicular distance sampling. Can. J. For. Res. 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.
• Gregoire, Timothy G.; Valentine, Harry T. 2003. Line intersect sampling: Ell-shaped transects and multiple intersections. Environmental and Ecological Statistics. 10: 263-279
• Ducey, M. J.; Jordan, G. J.; Gove, J. H.; Valentine, H. T. 2002. A practical modification of horizontal line sampling for snag and cavity tree inventory. Canadian Journal of Forest Research 32:1217-1224
• Gove, Jeffrey H.; Ducey, Mark J.; Valentine, Harry T. 2002. Multistage point relascope and randomized branch sampling for downed coarse woody debris estimation. Forest Ecology and Mangement. 155: 153-162.
• Valentine, Harry T. 2002. Randomized branch sampling. In: El-Shaarawi, Abdel H.; Piegorsch, Walter, W., eds. Encyclopedia of Environmetrics, Volume 3 M-R: John Wiley & Sons, Ltd. 1682-1684.
• Makela, Annikki; Valentine, Harry T. 2001. The ratio of NPP to GPP: evidence of change over the course of stand development. Tree Physiology. 21: 1015-1030.
• Valentine, Harry T.; Gove, Jeffrey H.; Gregoire, Timothy G. 2001. Monte Carlo approaches to sampling forested tracts with lines or points. Canadian Journal of Forest Research. 31: 1410-1424.
• Gove, Jeffrey H.; Valentine, Harry T.; Holmes, Michael J. 2000. A field test of cut-off importance sampling for bole volume. In: Hansen, Mark; Burk, Tom, eds. Integrated tools for natural resources inventories in the 21st century. Gen. Tech. Rep. NC-212. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 372-376.
• Green, Edwin J.; MacFarlane, David W.; Valentine, Harry T. 2000. Assessing uncertainty in mechanistic models. In: Hansen, Mark; Burk, Tom, eds. Integrated tools for natural resources inventories in the 21st century. Gen. Tech. Rep. NC-212. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 501-506.
• Hollinger, D.Y.; Goltz, S.M.; Davidson, E.A.; Lee, J.T.; Tu, K.; Valentine, H.T. 1999. Seasonal patterns and environmental control of carbon dioxide and water vapour exchange in an ecotonal boreal forest. Global Change Biology. 5: 891-902.
• Gregoire, Timothy G.; Valentine, Harry T. 1995. A sampling strategy to estimate the area and perimeter of irregularly shaped planar regions. Forest Science. 41(3): 470-476.
• Valentine, Harry T.; Furnival, George M.; Gregoire, Timothy G. 1991. Confidence intervals from single observations in forest research. Forest Science. 37(1): 370-373.
• Valentine, Harry T. 1983. An approach to modeling the consequences of beech mortality from beech bark disease. In: Proceedings, I.U.F.R.O. Beech Bark Disease Working Party Conference; 1982 September 26-October 8; Hamden, CT. Sponsored by the USDA Forest Service, Northeastern Forest Experiment Station. Gen. Tech. Rep. WO-37. [Washington, DC]: U.S. Department of Agriculture, Forest Service: 134-137.
• Valentine, Harry T. 1978. Estimating Defoliation of Hardwoods Using Blade-petiole Relations. Res. Pap. NE-405. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 5p.
• Campbell, Robert W.; Valentine, Harry T.; Valentine, Harry T. 1972. Tree condition and mortality following defoliation by the gypsy moth. Res. Pap. NE-236. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 331 p.