Predicting Resin Pockets in Radiata Pine Logs from Blemishes on Log Ends
Keywords:
Blemishes, log grading, log segregation, <i>Pinus radiata</i>, pitch pockets, resin pockets, wood qualityAbstract
More than 120 radiata pine (Pinus radiata D. Don) sawlogs, from two sites, were assessed for resin pockets and blemishes (resin streaks, bark pockets, colored marks, and other grain deviations) on the log ends. At both sites, the assessment of blemishes on the log ends improved the prediction of resin pockets on the lumber after sawing (r2 = 0.29 and 0.49), beyond the prediction achieved by assessing resin pockets on the log ends alone (r2 = 0 and 0.24). Noting only the presence or absence of blemishes on the log ends enabled explanation of half the variation between logs in loss of clear cuttings due to docking out resin pockets from the lumber (r2 = 0.50, P < 0.001). Since the log ends were assessed after ordinary chainsaw cuts were made, we believe that blemishes could be recognized by log graders, and that it should be possible to develop selection procedures for sawlogs that minimize the value losses associated with resin pockets.References
Beets, P. N., and R. K. Brownlie. 1987. Puruki experimental catchment: Site, climate, forest management and research, NZ J. For. Sci. 17: 137-160.nClifton, N. C. 1969. Resin pockets in Canterbury radiata pine. NZ J. For. 14:38-49.nCown, D. J. 1973. Resin pockets: Their occurrence and formation in New Zealand forests. NZ J. For. 18:233-251.nCown, D. J., 1992. Corewood (juvenile wood) in Pinus radiata—Should we be concerned. NZ J. For. Sci. 22:87-95.nFrey-Wyssling, A. 1938. Über die Entstehung von Harztaschen. Holz Roh-Werkst. 1:329-332.nFrey-Wyssling, A., 1942. Über die Entstehung von Harztaschen. Schweiz Z. Forstw. 93:101-106.nMathSoft. 1995. S-PLUS Version 3.4 for UNIX. StatSci Division, MathSoft Inc, Seattle, WA.nMcConchie, D. L., 1997. Wood quality in the Puruki experimental forest. Pages 15-18 in B. G. Ridoutt, ed. Managing variability in resource quality. New Zealand Forest Research Institute Bulletin 202. 44 pp.nMcConchie, D. L., and B. G. Ridoutt. 1997. Resin pockets: Strategies for clearwood production in regions. NZ Tree Grower May:37-39.nNew Zealand Ministry of Forestry. 1996. National exotic forest description: National and regional wood supply forecasts. Ministry of Forestry, Wellington, NZ. 149 pp.nPeterson, H. 1991. En orienterande studie om kådlåpor med speciell hänsyn till gran. Sveriges lantbruksuniversitet. Examensarbete i Virkeslära (22).nRidoutt, B. G., C. T. Sorensson, and M. J. F. Lausberg. 1998. Wood properties of twenty highly ranked radiata pine seed production parents selected for growth and form. Wood Fiber Sci. 30:128-137.nSchumacher, P., M. Tratzmiller, and D. Grosser. 1997. Losses in quality of spruce wood caused by pitch pockets in relation to thinning intensity. Holz Roh-Werkst. 55:254.nTemnerud, E. 1996a. Pitch pockets in Picea abies: Variation in amount, number and size within trees and within a stand. Scand. J. For. Res. 11:164-173.nTemnerud, E. 1996b. Pitch pockets in Picea abies: Methods of measurement and effects of final felling on the border part of the remaining forest. Scand. J. For. Res. 11:174-181.nTemnerud, E. 1997. Formation and prediction of resin pockets inPicea abies (L.) Karst. Doctoral thesis, Swedish University of Agricultural Sciences, Uppsala, Sweden. 163 pp.nTombleson, J. D., and C. S. Inglis. 1988. Comparison of radiata pine shelterbelts and plantations. Pages 261-278 in P. Maclaren, ed. Proc Agroforestry Symposium. New Zealand Forest Research Institute Bull. 139, 299 pp.nWiltshire, A. 1997. Regime re-evaluation, Rayonier Ltd—A case study. In Proceedings Forest Industry Engineering Association of New Zealand 1997 Conference—Pruned Radiata—Is Its Future Clear. Dunedin.n
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