Preharvest Veneer Quality Evaluation of Douglas-fir Stands Using Time-of-Flight Acoustic Technique
Keywords:
<i>Pseudotsuga menziesii</i>, stiffness, impact-based tool, sound velocity, dynamic modulus of elasticityAbstract
Acoustic technology has been successfully used as a nondestructive technique for assessing mechanical properties of various wood products and species as well as in tree selection and breeding based on stiffness. In an ongoing endeavor to optimize merchandizing and enhance timber value recovery, seven second-growth Douglas-fir stands of similar age classes in western Oregon were sampled, totaling 1400 trees and more than 3000 logs. The objectives of this research were to 1) investigate the spatial variability of time-of-flight (TOF) acoustic velocities in standing Douglas-fir trees; 2) develop relationships between average Director ST300® (ST300) TOF acoustic velocities of standing Douglas-fir trees and actual veneer produced; and 3) determine the influence of diameter at breast height (DBH) on TOF sound speeds. Spatial location of the stands in terms of their latitude, longitude, or altitude had no predictive capability regarding their veneer quality. Standing tree TOF acoustic velocity and the actual G1/G2 veneer produced using a stress-wave grade sorter had no significant correlation. Significant differences were found among the three different ST300 tools used along the duration of the study as well as between the two opposite side measurements within trees. DBH correlated poorly with both acoustic velocity and G1/G2 veneer recovery.References
Acuna MA, Murphy GE (2006) Geospatial and within tree variation of wood density and spiral grain in Douglas-fir. Forest Prod J 56(4):81-85.nAdams DM, Schillinger RR, Latta G, Van Nalts A (2002) Timber harvest projections for private land in western Oregon. Oregon State Univ., Forest Res. Lab. Research Contribution 37. 44 pp.nAmishev DY, Murphy GE In-forest assessment of veneer grade Douglas-fir logs based on acoustic measurement of wood stiffness. Forest Prod J (in review).nAndrews M (2002) Wood quality measurement—son et lumiere. New Zeal J For Sci 47:19-21.nBarbour RJ, Kellogg RM (1990) Forest management and end-product quality: A Canadian perspective. Can J For Res 20:405-414.nBriggs D, Thienel G, Turnblom E, Lowell E, Dykstra D, Ross RJ, Wang X, Carter P (2008) Estimating wood stiffness along the trees to product chain: Tools, relationships and silviculture influences. Pages 85-102 in Proc of the Western Forestry and Conservation Association Wood Quality Workshop: Current Research & Developments in Wood Stiffness & Other Key Properties. May 28, 2008, Vancouver, WA.nCarter P, Briggs D, Ross RJ, Wang X (2005) Acoustic testing to enhance western forest values and meet customer wood quality needs. Pages 121-129 in CH Harrington and S Schoenholtz, eds. Productivity of western forests: A forest products focus. USDA Forest Service PNW Res Sta Gen Tech Rep PNW-GTR-642.nCarter P, Chauhan SS, Walker JCF (2006) Sorting logs and lumber for stiffness using Director HM200. Wood Fiber Sci 38(1):49-54.nChauhan SS, Walker JCF (2006) Variations in acoustic velocity and density with age, and their interrelationships in radiata pine. For Ecol Mgmt 229:388-394.nClarke CR, Barnes RD, Morris AR (2002) Effect of environment on wood density and pulping of five pine species grown in Southern Africa. Technical Association of the Pulp and Paper Industry of Southern Africa, October 2002, Durban, South Africa. http://tappsa.co.za/archive/APPW2002/Title/Effect_of_environment_on_wood_/effect_of_environment_on_wood_.html'>http://tappsa.co.za/archive/APPW2002/Title/Effect_of_environment_on_wood_/effect_of_environment_on_wood_.htmlnDickson RL, Matheson AC, Joe B, Ilic J, Owen JV (2004) Acoustic segregation of Pinus radiata logs for sawmilling. New Zeal J For Sci 34(2):175-189.nEastin I (2005) Does lumber quality really matter to builders? Pages 131-140 in C H Harrington and S Schoenholtz, eds. Productivity of western forests: A forest products focus. USDA Forest Service PNW Res Sta Gen Tech Rep PNW-GTR-642.nGartner BL (2005) Assessing wood characteristics and wood quality in intensively managed plantations. J For 100(2):75-77.nGrabianowski M, Manley B, Walker JCF (2006) Acoustic measurements on standing trees, logs and green lumber. Wood Sci Technol 40:205-216.nHuang C-L, Lindstrom H, Nakada R, Ralston J (2003) Cell wall structure and wood properties determined by acoustics—A selective review. Holz Roh Werkst 61:321-335.nJoe B, Dickson R, Raymond C, Ilic J, Matheson C (2004) Prediction of Eucalyptus dunnii and Pinus radiata timber stiffness using acoustics. RIRDC Publication No 04/013. RIRDC, Kingston, Australia. 121 pp.nKellogg RM (1989) Second growth Douglas-fir: Its management and conversion for value. Forintek Canada Corp., Vancouver, BC Spec. Publ. SP-32. 173 pp.nLasserre JP, Mason EG, Watt MS (2007) Assessing corewood acoustic velocity and modulus of elasticity with two impact based instruments in 11-year-old trees from a clonal-spacing experiment of Pinus radiata D. Don. For Ecol Mgmt 239:217-221.nLindstrom H, Harris P, Nakada R (2002) Methods for measuring stiffness of young trees. Holz Roh Werkst 60:165-174.nLindstrom H, Harris P, Sorensson CT, Evans R (2004) Stiffness and wood variation of 3-year old Pinus radiata clones. Wood Sci Technol 38:579-597.nMahon JM Jr, Jordan L, Schimleck LR, Clark A III, Daniels RF A comparison of sampling methods for a standing tree acoustic device. South J Appl For (in review).nMatheson AC, Dickson RL, Spencer DJ, Joe B, Ilic J (2002) Acoustic segregation of Pinus radiata logs according to stiffness. Ann Sci 59:471-477.nMurphy GE, Marshall HD, Evanson AW (2005) Production speed effects on log-making error rates and value recovery for a mechanized processing operation in radiata pine in New Zealand. South Afr For J 204:23-35.nNewsletters SMC (2008) Non-destructive evaluation of wood quality in standing Douglas-fir trees and logs. University of Washington, Seattle, WA. http://www.cfr.washington.edu/research.smc/'>http://www.cfr.washington.edu/research.smc/nRamsey FL, Shafer DW (2002) The statistical sleuth: A course in methods of data analysis. 2nd ed. Duxbury Press, Florence, KY. 742 pp.nRippy RC, Wagner FG, Gorman TM, Layton HD, Bodenheimer T (2000) Stress-wave analysis of Douglas-fir logs for veneer properties. Forest Prod J 50(4):49-52.nRoss RJ, McDonald KA, Green DW, Schad KC (1997) Relationship between log and lumber modulus of elasticity. Forest Prod J 47(2):89-92.nSAS Institute Inc (2004) SAS/STAT User's Guide: Version 9.1.3. Cary, NC.nToulmin MJ, Raymond CA (2007) Developing a sampling strategy for measuring acoustic velocity in standing Pinus radiata using the TreeTap time of flight tool. N Z J For Sci 37(1):96-111.nWaghorn MJ, Mason EG, Watt MS (2007) Influence of initial stand density and genotype on longitudinal variation in modulus of elasticity for 17-year-old Pinus radiata. For Ecol Mgmt 252:67-72.nWagner FG, Gorman TM, Rippy RC, Layton HD, Bodenheimer T, Keenan A, Keegan CE, Ross RJ (1998) Nondestructive evaluation of veneer properties from standing trees. Unpublished report. Univ. of Idaho, Moscow, ID.nWagner FG, Gorman TM, Wu SY (2003) Assessment of intensive stress-wave scanning of Douglas-fir trees for predicting lumber MOE. Forest Prod J 53(3):36-39.nWang X, Ross RJ, Carter P (2007a) Acoustic evaluation of wood quality in standing trees. Part I. Acoustic wave behavior. Wood Fiber Sci 39(1):28-38.nWang X, Carter P, Ross RJ, Brashaw BK (2007b) Acoustic assessment of wood quality of raw forest materials—A path to increased profitability. Forest Prod J 57(5):6-14.nWang X, Ross RJ, McClellan M (2001) Nondestructive evaluation of standing trees with a stress wave method. Wood Fiber Sci 33:522-533.nWang X, Sharplin N, Carter P, Ross RJ (2004) Method and apparatus for evaluation of standing timber. U.S. provisional application: 60/538,376.nXu P, Donaldson L, Walker J, Evans R, Downes G (2004) Effects of density and microfibril orientation of low-stiffness wood in radiata pine butt logs. Holzforschung 58:673-677.nXu P, Walker J (2004) Stiffness gradients in radiata pine trees. Wood Sci Technol 38(1):1-9.nZhang SY, Qibin Y, Beaulieu J (2004) Genetic variation in veneer quality and its correlation to growth in white spruce. Can J For Res 34:1311-1318.n
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