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The effect of stand density management on Pinus patula lumber properties

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Abstract

Rapid growth rates and the accompanying reduced rotation ages of forest plantations have resulted in increased proportions of juvenile wood. Growing space markedly influences growth rate and may be manipulated by stand density management. The objective of this study was to evaluate the effect of stand density on the modulus of elasticity (MOE), modulus of rupture (MOR) and other selected properties of young (16–20 years) South African-grown Pinus patula lumber. Thirty-seven trees from two commercial stands were processed into 71 logs, cant sawn into lumber and tested for MOE, MOR, wood density and distortion. The first stand was planted at 1334 stems ha−1 and thinned to 827 stems ha−1 at age 11. The second stand was planted at 1667 stems ha−1 and was unthinned. Lumber from a previous study on 17 different commercial stands from more conventional (lower) stand density management regimes was also analysed using linear mixed-effect models. Only lumber from the 1667 stems ha−1 stand conformed to the requirements for structural use and had a considerably higher mean MOE of 8967 MPa compared to 7134 MPa for the 1334/827 stems ha−1 stand and 5556 MPa for the more conventional stands. MOR values were adequate for all stands. Unlike previous studies on other species, slenderness did not seem to have a profound effect on the MOE of the lumber from these P. patula trees. Stand density management therefore has the potential to increase lumber stiffness of P. patula and should be considered as a forest management intervention for wood quality improvement by saw-log growers in South Africa.

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References

  • Abramoff MD, Magalhaes PJ, Ram SJ (2004) Image processing with ImageJ. Biophotonics Int 11:36–42

    Google Scholar 

  • Akaike H (1974) A new look at the statistical model identification. IEEE Trans Autom Control 19:716–723

    Article  Google Scholar 

  • Antony F, Schimleck LR, Jordan L et al (2012) Modeling the effect of initial planting density on within tree variation of stiffness in loblolly pine. Ann For Sci 69:641–650. https://doi.org/10.1007/s13595-011-0180-1

    Article  Google Scholar 

  • Auty D, Moore J, Achim A et al (2017) Effects of early respacing on the density and microfibril angle of Sitka spruce wood. Forestry. https://doi.org/10.1093/forestry/cpx004

    Article  Google Scholar 

  • Bascuñán A, Moore JR, Walker JCF (2006) Variations in the dynamic modulus of elasticity with proximity to the stand edge in radiata pine stands on the Canterbury Plains, New Zealand. N Z J For 51:4–8

    Google Scholar 

  • Biblis E (2006) Flexural properties and compliance to visual grade requirements of 2 by 4 and 2 by 6 loblolly pine lumber obtained from a 19-year-old plantation. For Prod J 56:71–73

    Google Scholar 

  • Burdzik WMG (2004) Grade verification of SA pine—bending, modulus of rupture, modulus of elasticity, tension and compression. S Afr For J 202:21–27. https://doi.org/10.1080/20702620.2004.10431786

    Article  Google Scholar 

  • Carle J, Vuorinen P, Del Lungo A (2002) Status and trends in global forest plantation development. For Prod J 52:13

    Google Scholar 

  • Carter RE, Miller IM, Klinka K (1986) Relationships between growth form and stand density in immature Douglas-fir. For Chron 62:440–445. https://doi.org/10.5558/tfc62440-5

    Article  Google Scholar 

  • Clark A III, Jordan L, Schimleck L, Daniels RF (2008) Effect of initial planting spacing on wood properties of unthinned loblolly pine at age 21. For Prod J 58:78–83

    Google Scholar 

  • Cown DJ (1992) Corewood (juvenile wood) in Pinus radiata—should we be concerned? N Z J For Sci 22:87–95

    Google Scholar 

  • Crickmay and Associates (2015) South African lumber index for February 2015. Crickmay and Associates (Pty) Ltd, Hilton

    Google Scholar 

  • DAFF (2017) Report on commercial timber resources and primary roundwood processing in South Africa. Department of Agriculture, Forestry and Fisheries, Pretoria

    Google Scholar 

  • Dahlen J, Jones PD, Seale RD, Shmulsky R (2012) Bending strength and stiffness of in-grade Douglas-fir and southern pine No. 2 2 × 4 lumber. Can J For Res 42:858–867. https://doi.org/10.1139/x2012-041

    Article  Google Scholar 

  • Downes GM, Nyakuengama JG, Evans R et al (2002) Relationship between wood density, microfibril angle and stiffness in thinned and fertilized Pinus radiata. IAWA J 23:253–265. https://doi.org/10.1163/22941932-90000302

    Article  Google Scholar 

  • Dowse GP, Wessels CB (2013) The structural grading of young South African grown Pinus patula sawn timber. South For J For Sci 75:37–41. https://doi.org/10.2989/20702620.2012.743768

    Article  Google Scholar 

  • du Toit B, Smith CW, Little KM et al (2010) Intensive, site-specific silviculture: manipulating resource availability at establishment for improved stand productivity. A review of South African research. For Ecol Manag 259:1836–1845. https://doi.org/10.1016/j.foreco.2009.07.015

    Article  Google Scholar 

  • Dvorak W, Hodge G, Kietzka J et al (2000) Pinus patula. Conservation & testing of tropical & subtropical forest tree species by the CAMCORE cooperative. College of Natural Resources, NCSU, Raleigh, pp 148–173

    Google Scholar 

  • Erasmus J, Kunneke A, Drew DM, Wessels CB (2018) The effect of planting spacing on Pinus patula stem straightness, microfibril angle and wood density. For Int J For Res 10:1–12. https://doi.org/10.1093/forestry/cpy005

    Article  Google Scholar 

  • FAO (2005) Global forest resources assessment 2005: progress towards sustainable forest management. FAO Forestry Paper 147

  • Froneman GM, Wessels CB (2018) Increased planting density as a means for improving Pinus elliottii lumber stiffness. South For J For Sci. https://doi.org/10.2989/20702620.2017.1354282

    Article  Google Scholar 

  • Fujimoto T, Koga S (2010) An application of mixed-effects model to evaluate the effects of initial spacing on radial variation in wood density in Japanese larch (Larix kaempferi). J Wood Sci 56:7–14. https://doi.org/10.1007/s10086-009-1045-1

    Article  Google Scholar 

  • Godsmark R (2017) South African forestry and forest products industry 2016. Forestry South Africa. https://www.forestry.co.za

  • Green SR, Grace J, Hutchings NJ (1995) Observations of turbulent air flow in three stands of widely spaced Sitka spruce. Agric For Meteorol 1923:205–225

    Article  Google Scholar 

  • Griess VC, Uhde B, Ham C, Seifert T (2016) Product diversification in South Africa’s commercial timber plantations: a way to mitigate investment risk. South For J For Sci 78:145–150

    Article  Google Scholar 

  • Huang C-L, Lindström H, Nakada R, Ralston J (2003) Cell wall structure and wood properties determined by acoustics—a selective review. Holz als Roh- und Werkst 61:321–335. https://doi.org/10.1007/s00107-003-0398-1

    Article  CAS  Google Scholar 

  • Johansson C-J (2003) Grading of timber with respect to mechanical properties. In: Thelandersson S, Larsen HJ (eds) Timber engineering. Wiley, New York, p 445

    Google Scholar 

  • Kennedy RW (1995) Coniferous wood quality in the future: concerns and strategies. Wood Sci Technol 29:321–338

    Article  CAS  Google Scholar 

  • Kipuputwa C, Grzeskowiak V, Louw JH (2010) The use of near-infrared scanning for the prediction of pulp yield and chemical properties of Pinus patula in the Mpumalanga escarpment area of South Africa. South For 72:181–189. https://doi.org/10.2989/20702620.2010.547270

    Article  Google Scholar 

  • Lachenbruch B, Moore J, Evans R (2011) Radial variation in wood structure and function in woody plants, and hypotheses for its occurrence. In: Meinzer FC, Lachenbruch B, Dawson TE (eds) Size- and age-related changes in tree structure and function. Springer, Dordrecht, pp 121–164

    Chapter  Google Scholar 

  • Larson PR (1969) Wood formation and the concept of wood quality by principal plant physiologist. North Central Forest Experiment Station. 75

  • Larson PR, Kretschmann DE, Clark III A, Isebrands JG (2001) Formation and properties of juvenile wood in southern pines: a synopsis. Madison

  • Lasserre J, Mason E, Watt M (2005) The effects of genotype and spacing on Pinus radiata corewood stiffness in an 11-year old experiment. For Ecol Manag 205:375–383

    Article  Google Scholar 

  • Lasserre JP, Mason EG, Watt MS, Moore JR (2009) Influence of initial planting spacing and genotype on microfibril angle, wood density, fibre properties and modulus of elasticity in Pinus radiata D. Don corewood. For Ecol Manag 258:1924–1931. https://doi.org/10.1016/j.foreco.2009.07.028

    Article  Google Scholar 

  • Lindstrom MJ, Bates DM (1990) Nonlinear mixed effects models for repeated measures published by: international biometric society stable. Biometrics 46:673–687

    Article  CAS  Google Scholar 

  • Louw WJA (2006) General history of the South African forest industry: 2003 to 2006. S Afr For J 208:79–88. https://doi.org/10.2989/10295920609505264

    Article  Google Scholar 

  • Louw JH, Scholes M (2002) The influence of site factors on nitrogen mineralization in forest soils of the mpumalanga escarpment area: South Africa. S Afr For J 193:47–63. https://doi.org/10.1080/20702620.2002.10433518

    Article  Google Scholar 

  • Madsen B (1992) Structural behaviour of timber. Timber Engineering, North Vancouver

    Google Scholar 

  • Malan FS (2003) The wood quality of the South African timber resource for high-value solid wood products and its role in sustainable forestry. S Afr For J 198:53–62. https://doi.org/10.1080/20702620.2003.10431735

    Article  Google Scholar 

  • Malan FS (2010) Corewood in South African pine: necessity and opportunities for improvement. S For J For Sci 72:99–105. https://doi.org/10.2989/20702620.2010.507032

    Article  Google Scholar 

  • Malan FS, Retief RJ, Male JR (1997) The influence of planting espacement on the wood density and pulping properties of Pinus patula. S Afr For J 180:23–32. https://doi.org/10.1080/10295925.1997.9631164

    Article  Google Scholar 

  • Moore J (2012) Growing fit-for-purpose structural timber what is the target and how do we get there? N Z J For 57:17–24

    Google Scholar 

  • Moore JR, Cown DJ (2017) Corewood (juvenile wood) and its impact on wood utilisation. Curr For Rep 3:107–118. https://doi.org/10.1007/s40725-017-0055-2

    Article  Google Scholar 

  • Moore J, Achim A, Lyon A et al (2009) Effects of early re-spacing on the physical and mechanical properties of Sitka spruce structural timber. For Ecol Manag 258:1174–1180. https://doi.org/10.1016/j.foreco.2009.06.009

    Article  Google Scholar 

  • Pinheiro JC, Bates DM (2000) Mixed-effects models in S and S-PLUS. Springer, New York

    Book  Google Scholar 

  • R Core Team (2018) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna. https://www.Rproject.org

  • Rais A, Poschenrieder W, Pretzsch H, Van De Kuilen JWG (2014) Influence of initial plant density on sawn timber properties for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Ann For Sci 71:617–626. https://doi.org/10.1007/s13595-014-0362-8

    Article  Google Scholar 

  • Roth BE, Li X, Huber DA, Peter GF (2007) Effects of management intensity, genetics and planting density on wood stiffness in a plantation of juvenile loblolly pine in the southeastern USA. For Ecol Manag 246:155–162. https://doi.org/10.1016/j.foreco.2007.03.028

    Article  Google Scholar 

  • SANS 10163-1 (2003) South African national standard. The structural use of timber Part 1: limit-states design. 2.3 edn. https://www.sabs.co.za

  • SANS 1783-2 (2013) South African national standard. Sawn softwood timber Part 2: stress-graded structural timber and timber for frame wall construction. 1.9 edn. https://www.sabs.co.za

  • SANS 6122 (2014) South African national standard. Structural timber - characteristic values of strength-graded timber - sampling, full-size testing and evaluation. 3 edn. https://www.sabs.co.za

  • Smith RGB, Palmer G, Davies M, Muneri A (2003) A method enabling the reconstruction of internal features of logs from sawn lumber: the log end template. For Prod J 53:95–98

    Google Scholar 

  • Spatz H, Bruechert F (2000) Basic biomechanics of self-supporting plants: wind loads and gravitational loads on a Norway spruce tree. For Ecol Manag 135:33–44

    Article  Google Scholar 

  • van Laar A (1978) The growth of unthinned Pinus patula in relation to spacing. S Afr For J 107:3–11

    Google Scholar 

  • Vikram V, Cherry ML, Briggs D et al (2011) Stiffness of Douglas-fir lumber: effects of wood properties and genetics. Can J For Res 41:1160–1173. https://doi.org/10.1139/x11-039

    Article  Google Scholar 

  • Waghorn MJ, Mason EG, Watt MS (2007a) Influence of initial stand density and genotype on longitudinal variation in modulus of elasticity for 17-year-old Pinus radiata. For Ecol Manag 252:67–72. https://doi.org/10.1016/j.foreco.2007.06.019

    Article  Google Scholar 

  • Waghorn MJ, Watt MS, Mason EG (2007b) Influence of tree morphology, genetics, and initial stand density on outerwood modulus of elasticity of 17-year-old Pinus radiata. For Ecol Manag 244:86–92. https://doi.org/10.1016/j.foreco.2007.03.057

    Article  Google Scholar 

  • Walker J (1993) Primary wood processing—principles and practice. Chapman & Hall, London

    Book  Google Scholar 

  • Walker JCF, Nakada R (1999) Understanding corewood in some softwoods: a selective review on stiffness and acoustics. Int For Rev 1:251–259

    Google Scholar 

  • Watt MS, Moore JR, Facon JP et al (2006) Modelling environmental variation in young’s modulus for Pinus radiata and implications for determination of critical buckling height. Ann Bot 98:765–775. https://doi.org/10.1093/aob/mcl161

    Article  PubMed  PubMed Central  Google Scholar 

  • Watt MS, Zoric B, Kimberley MO, Harrington J (2011) Influence of stocking on radial and longitudinal variation in modulus of elasticity, microfibril angle, and density in a 24-year-old Pinus radiata thinning trial. Can J For Res 41:1422–1431. https://doi.org/10.1139/x11-070

    Article  Google Scholar 

  • Wessels BC, Froneman GM (2015) The potential for improving the stiffness of young South African grown Pinus radiata lumber by using high planting densities. Pro Lingo 11:58–64

    Google Scholar 

  • Wessels CB, Petersen N-O (2015) Strength and stiffness capacity utilisation of timber members in roof truss structures. South For J For Sci 2:1–3. https://doi.org/10.2989/20702620.2015.1063033

    Article  Google Scholar 

  • Wessels CB, Dowse GP, Smit HC (2011) The flexural properties of young Pinus elliottii × Pinus caribaea var. hondurensis timber from the Southern Cape and their prediction from acoustic measurements. South For J For Sci 73:137–147. https://doi.org/10.2989/20702620.2011.640427

    Article  Google Scholar 

  • Wessels CB, Malan FS, Nel DG, Rypstra T (2014) Variation in strength, stiffness and related wood properties in young South African-grown Pinus patula. South For J For Sci 76:37–46. https://doi.org/10.2989/20702620.2013.870406

    Article  Google Scholar 

  • Wessels CB, Malan FS, Kidd M, Rypstra T (2015a) The variation of microfibril angle in South African grown Pinus patula and its influence on the stiffness of structural lumber. South For J For Sci 77:213–219. https://doi.org/10.2989/20702620.2015.1031575

    Article  Google Scholar 

  • Wessels CB, Malan FS, Seifert T et al (2015b) The prediction of the flexural lumber properties from standing South African-grown Pinus patula trees. Eur J For Res 134:1–18. https://doi.org/10.1007/s10342-014-0829-z

    Article  Google Scholar 

  • Xu P, Walker J (2004) Stiffness gradients in radiata pine trees. Wood Sci Technol 38:1–9

    Article  Google Scholar 

  • Zobel B, Jett J (2012) Genetics of wood production. Springer, New York

    Google Scholar 

  • Zobel B, Sprague JR (1998) Juvenile wood in forest trees. Springer, Berlin

    Book  Google Scholar 

  • Zwolinski J, Bayley AD (2001) Research on planting stock and forest regeneration in South Africa. New For 22:59–74. https://doi.org/10.1023/a:1012002229102

    Article  Google Scholar 

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Acknowledgements

The following organizations are gratefully acknowledged for funding this project: Sawmilling SA, Forestry SA, Sappi, York Timbers, Hans Merensky Foundation and the SA government’s THRIP programme. We also appreciate the help of Wilmour Hendrikse and Hannes Vosloo with fieldwork and data preparation. Thanks to the Lomati sawmill for processing and drying of lumber. Thanks to the anonymous reviewers for their helpful comments to improve this study.

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  1. Department of Forest and Wood Science, Stellenbosch University, Paul Sauer Building, Bosman Street, Stellenbosch, 7599, South Africa

    Justin Erasmus & C. Brand Wessels

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  1. Justin Erasmus
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Correspondence to C. Brand Wessels.

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Erasmus, J., Wessels, C.B. The effect of stand density management on Pinus patula lumber properties. Eur J Forest Res 139, 247–257 (2020). https://doi.org/10.1007/s10342-019-01253-8

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