Variation In Cell Dimensions and Fibril Angle For Two Fertilized Even-Aged Loblolly Pine Plantations


  • Todd F. Shupe
  • Elvin T. Choong
  • Douglas D. Stokke
  • Mark D. Gibson


cell-wall thickness, fiber length, microfibril angle, specific gravity


Increment core samples were obtained from randomly selected, nine-year-old loblolly pine (Pinus taeda L.) in two even-aged plantations in Louisiana in order to determine the variation in cell dimensions and fibril angle of the sites. The Homer site is representative of the growing conditions in north Louisiana, and the Bogalusa site is typical of the conditions in southeastern Louisiana. Both sites were subjected to similar site preparation and weed control and were fertilized in the juvenile period. The anatomical properties that were measured include: fiber length, cell-wall thickness, and microfibril angle (MFA). Observations were made in order to compare corewood (rings 2-4) and outerwood (rings 7-9) and also between earlywood and latewood. For both plantations, the statistical analysis revealed that cell-wall thickness and fiber length were significantly greater in outerwood and latewood than in corewood and earlywood, respectively. Microfibril angle was found to be significantly higher in corewood than in outerwood for both plantations. The anatomical properties were found to be more acceptable from an end-use perspective on the Homer site, which experienced slower diameter growth than the Bogalusa site.


American Society For Testing and Materials (ASTM). 1993. Standard test methods for specific gravity of wood and wood-base materials. In Annual Book of Standards, vol. 04.09 Wood. ASTM D 2395-83. Phildelphia, PA.nBailey, I. W., and M. R. Vestal. 1937. The orientation of cellulose in the secondary wall of tracheary cells. J. Arnold Arboretum 18(3):185-195.nBannan, M. W. 1967. Anticlinal divisions and cell length in conifer cambium. Can J. Bot. 24:769-776.nBendtsen, B. A. 1978. Properties of wood from improved and intensively managed trees. Forest Prod. J. 28(10):61-72.nBendtsen, B. A. and J. Senft. 1986. Mechanical and anatomical properties in individual growth rings of plantation-grown eastern cottonwood and loblolly pine. Wood Fiber Sci. 18(1):23-38.nBiblis, E. J. 1969. Transitional variation and relationships among properties within loblolly pine growth rings. Wood Sci. Technol. 3:14-24.nBrown, C. L. 1970. Physiology of wood formation in conifers. Wood Science 3(1):8-22.nBurns, P. Y. 1982. Unpublished data. Louisiana State University, School of Forestry. Wildlife and Fisheries, Baton Rouge, LA.nBurns, P. Y., S. C. Hu, and D. P. Reed. 1985. Intensive culture of loblolly pine, in southeastern Louisiana: Results through age 21. Unpublished manuscript.nChoong, E. T., B. H. Box, and P. J. Fogg. 1970. Effects of intensive cultural management on growth and certain wood properties of young loblolly pine. Wood Fiber 2:105-112.nClason, T. R. 1994. Personal communication with T. F. Shupe. June 10-11.nEvans, D. L., P. Y. Burns, N. E. Linnartz, and C. J. Robinson. 1983. Forest habitat regions of Louisiana. Res. Rep. No. 1. School of Forestry and Wildlife Management. Louisiana Agric. Exp. Sta., LSU Agric. Center, Baton Rouge, LA.nForest Products Laboratory. 1987. Wood handbook: Wood as an engineering material. Agric. Handb. #72. USDA, Washington, DC.nGoggans, J. F. 1964. Correlation and heritability of certain wood properties in loblolly pine (Pinus taeda L.). TAPPI 47:318-322.nHarlow, W. M., E. S. Harrar, and F. M. White. 1979. Textbook of dendrology. 6th ed. McGraw-Hill Book Co., New York, NY.nIfju, G. 1969. Within-growth-ring variation in some physical properties of southern pine wood. Wood Science 2:11-19.nJackson, L. W. R., and W. E. Morse. 1965. Tracheid length variation in single rings of loblolly, slash, and shortleaf pine. J. Forestry 63(2): 110-112.nKoch, P. 1972. Utilization of the southern pines. Vol. 1, USDA Forest Serv., Agric. Handbook No. 420. p. 734.nKramer, P. J., and T. T. Kozlowski. 1979. Physiology of wood plants. Academic Press, Inc., Orlando, FL.nLarson, P. R. 1969. Wood formation and the concept of wood quality. Bulletin No. 74. Yale Univ. School of Forestry, New Haven. CT.nLinnartz, N. E., E. T. Choong, and P. Underwood. 1970. Diameter growth, specific gravity, and tracheid length in four-year-old loblolly pine in response to fertilizer treatment. Louisiana State Univ. Forestry Note #90. LSU & A&M College, Baton Rouge, LA.nMcMillin. C. W. 1973. Fibril angle of loblolly pine wood as related to specific gravity, growth rate, and distance from pith. Wood Sci. Technol. (7):251-255.nMegraw, R. A. 1985. Wood quality factors in loblolly pine—The influence of tree age, position in tree and cultural practice on wood specific gravity, fiber length, and fibril angle. TAPPI Press, Atlanta, GA.nPaul, B. H. 1939. Variation in the specific gravity of the springwood and summerwood of four species of southern pines. J. Forestry 37:478-482.nPosey, C. E. 1964. The effects of fertilization upon wood properties of loblolly pine. Technical report #22. School of Forestry. North Carolina State Univ., Raleigh, NC.nSenft, J. F., and B. A. Bendtsen. 1985. Measuring microfibrillar angles using light microscopy. Wood Fiber Sci. 17(4):564-567.nTaylor, F. W. 1982. Growth ring characteristics, specific gravity, and fiber length of rapidly grown loblolly pine. Wood Fiber 14(3):204-209.nTaylor, F. W., and J. S. Moore. 1981. A comparison of earlywood and latewood tracheid lengths of loblolly pine. Wood Fiber 13(3):159-165.nTaylor, F. W. and J. D. Burton 1982. Growth ring characteristics, specific gravity, and fiber length of rapidty grown loblolly pine. Wood Fiber 14(3):204-210.nUSDA Forest Service. 1965. Status report. Southern wood density survey. USDA Forest Serv. Res. Pap. FPL-26. Forest Products Lab., Madison. WI.nUSDA Soil Conservation Service. 1989. Soil survey of Claiborne Parish. Louisiana.nUSDA Soil Conservation Service. 1991. Soil survey of Washington Parish. Louisiana.nWahlenberg, W. G. 1960. Loblolly pine: Its use, ecology, regeneration, protection, growth, and management. The Duke Univ. School of Forestry, Durham. NC.nWoodson, G. E., and P. Koch. 1970. Tool forces and chip formation of loblolly pine. USDA Forest Serv. Res. Pap. SO-52. South. Forest Exp. Sta., New Orleans, LA.nYao, J. 1970. Influence of growth rate on specific gravity and other selected properties of loblolly pine. Wood Sci. Technol. 4:163-175.nZobel, B. J. 1961. Inheritance of wood properties in conifers. Silvae Genet. 10:65-70.n






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