Assessment of White Spruce and Jack Pine Stem Curvature from a Nelder Spacing Experiment

Authors

  • D. Belley
  • M. Beaudoin
  • I. Duchesne
  • S. Vallerand
  • Q. J. Tong
  • D. E. Swift

Keywords:

Curvature assessment methods, stem quality, Optitek, stem shape, jack pine, white spruce, Nelder plantation

Abstract

This study presents a method for calculating stem curvature for trees with multiple deviations. Generally, tree curvature is assessed using the maximum deflection method. It consists of measuring the farthest point from a straight line drawn between the large and small ends of a stem. It works fairly well for a single deviation but gives poorer results for stems with several deviations. The stems used for developing this method were harvested from a 32-yr-old Nelder spacing experiment established near Woodstock, New Brunswick, Canada. A total of 96 trees were selected for this study from the white spruce (Picea glauca [Moench] Voss) and jack pine (Pinus banksiana Lamb.) that were planted on the same Nelder circle. This particular plantation design offered a gradient of initial spacings ranging from 640 to 12,000 stems/ha. Results of analysis revealed that initial spacing had an impact on tree curvature. Stem curvature increased with wider initial spacing. However, this influence varied between species and differed according to the method used to calculate curvature. The vector length calculation method showed that stem curvature in jack pine was more pronounced and more often encountered at lower densities than in white spruce. It was also observed that tree shape was influenced by the cardinal points with white spruce growing more in westerly and southerly directions.

References

Bacon DW, Watts DG (1971) Estimating the transition between two intersecting straight lines. Biometrika 58(3):525-534.nBallard LA, Long JN (1988) Influence of stand density on log quality of lodgepole pine. Can J For Res 18(7): 911-916.nBirk EM (1991) Stem and branch form of 20-year-old radiata pine in relation to previous land use. Aust For 54(1-2):30-39.nCampbell RK (1965) Phenotypic variation and repeatability of stem sinuosity in Douglas-fir. Northwest Sci 39:47-59.nGray HR (1956) The form and taper of forest-tree stems. Paper 32. Imperial Forest Institute, Oxford, UK.nIvkovic M, Wul HX, Spencer DJ, McRae TA (2007) Modelling the effects of stem sweep, branch size and wood stiffness of radiata pine on structural timber production. Aust For 70(3):173-184.nJozsa LA, Middleton GR (1997) Les caractéristiques déterminant la qualité du bois: Nature et conséquences pratiques. Pub. spéciale SP-34F. Forintek Canada Corp., Division de l'Est. Sainte-foy, Québec, Canada. 43 pp.nKrause C, Plourde PY (2008) Stem deformation in young plantations of black spruce (Picea mariana [Mill.] B. S. P.) and jack pine (Pinus banksiana Lamb.) in the boreal forest of Quebec, Canada. For Ecol Mgmt 255(7): 2213-2224.nLarson PR (1963) Stem form development of forest trees. Forest Sci Monograph 5. 42 pp.nLoup C (1990) Le développement architectural du pin maritime. Deuxième séminaire sur Achitecture, Structure, Mécanique de l'arbre. University of Montpellier II, Montpellier, France. pp. 34-54.nMoberg L (1999) Variation in knot size of Pinus sylvestris in two initial spacing trials. Silva Fennica 33(2):131-144.nNelder JA (1962) New kinds of systematic designs for spacing experiments. Biometrics 18(3):283-307.nPanshin AJ, de Zeeuw C (1980) Textbook of wood technology. 4th ed. McGraw-Hill, New York, NY.nPetro FJ, Calvert WW (1976) How to grade hardwood logs for factory lumber. Forintek Canada Corp., Eastern Laboratory, Ottawa, Ontario, Canada. 64 pp.nPolge H, Illy G (1967) Observations sur l'anisotropie du pin maritime des Landes. Ann Sci For 24(3):205-231.nRadi M, Castera P (1992) Qualification de la forme de deux pins maritimes en liaison avec la structure de leur bois. Ann Sci For 49:185-200.nRast ED, Sonderman DL, Gammon GL (1973) A guide to hardwood log grading. Gen. Tech. Rep. NE-1. U. S. Department of Agriculture, Forest Service, Northeastern Experiment Station, Upper Darby, PA. 32 pp.nSharma M, Zhang SY (2004) Variable-exponent taper equations for jack pine, black spruce, and balsam fir in eastern Canada. For Ecol Mgmt 198(1-3):39-53.nSierra-de-Grado R, Moulia B, Fournier M, Alia R, Diez-Barra R (1997) Genetic control of stem form in Pinus pinaster Ait. seedlings exposed to lateral light. Trees-Struct Funct 11:455-461.nSpicer R, Gartner BL, Darbyshire RL (2000) Sinuous stem growth in a Douglas-fir (Pseudotsuga menziesii) plantation: Growth patterns and wood-quality effects. Can J For Res 30:761-768.nTemel F, Adams WT (2000) Persistence and age genetic correlation of stem defects in coastal Douglas-fir. Forest Genet 2(7):145-153.nTong QJ, Zhang SY (2005) Impact of initial spacing and precommercial thinning on jack pine tree growth and stem quality. For Chron 81(3):418-428.n

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Published

2013-07-17

Issue

Number 3 / July 2013

Section

Research Contributions

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