Effect of stocking on juvenile wood stiffness for three Eucalyptus species
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The effects of stocking on wood stiffness (MoE) for three Eucalyptus species are quantified using a 6-year-old trial established in New South Wales, Australia. An acoustic time-of-flight tool measured the velocity between two probes in the outerwood, from which the stiffness was estimated. Four stocking levels (714, 1,250, 1,667 and 3,333 sph) were examined. Stiffness varied significantly between all species, with E. cloeziana showing the highest stiffness (14.2–15.7 GPa), followed by E. pilularis (12.2–13.5 GPa) and E. dunnii (10.7–12.6 GPa). There was a stiffness increase (around 11%) between 714 and 1,250 stems/ha for all species but thereafter differences between stockings were not always significant. Trees were also assessed for basic density, dbh, total height, crown area, green crown height and stem slenderness (height/dbh). Only stem slenderness had a significant association (0.41 ± 0.17) with stiffness. These findings suggest that, where stiffness is a priority, forest managers could reduce establishment costs with low stockings (around 1,250 stems/ha).
KeywordsWood stiffness Stocking Eucalyptus Silviculture
Forests New South Wales provided logistical support for the field work. Lachlan Kirk (School of Forestry, University of Canterbury) provided technical assistance to Eddie Warren in the field. Many thanks to Richard Woollons (School of Forestry, University of Canterbury) for valuable comments on the statistical analyses.
- Bascuñán A (2004) The influence of wind on radiata pine tree shape and wood stiffness. Master of science thesis, School of Forestry, University of Canterbury, New Zealand, 199 ppGoogle Scholar
- Burdon RD, Kibblewhite RP, Walker JCF, Megraw RA, Evans R, Cown D (2004) Juvenile versus mature wood: a new concept orthogonal to corewood versus outerwood with special reference to Pinus radiata and P. taeda. For Sci 50:399–415Google Scholar
- Chapelant E (2005) New insights for New Zealand’s School of Forestry: influence of genotype, weed competition and distance to canopy on wood stiffness. Unpublished report, New Zealand School of Forestry, University of Canterbury, 79 ppGoogle Scholar
- Grabianowski M (2003) Measuring acoustic properties in lumber and trees. Master of Science thesis, School of Forestry, University of Canterbury, New Zealand, 300 ppGoogle Scholar
- Grabianowski M, Manley B, Walker JCF (2004) Impact of stocking and exposure on outerwood acoustic properties of Pinus radiata in Eyrewell Forest. N Z J For 49:13–17Google Scholar
- Isbell RF (1996) The Australian soil classification. CSIRO, Collingwood, 143 ppGoogle Scholar
- Lasserre JP, Mason EG, Watt M (2004) The influence of initial stocking on corewood stiffness in a clonal experiment of 11-year-old Pinus radiata D.Don. N Z J For 49:18–23Google Scholar
- New South Wales State Forests (2001) State forests establishment report: E. pilularis, E. dunnii, E. cloeziana and C. variegata silvicultural regime trial. 11 ppGoogle Scholar
- New South Wales State Forests (2002) Log product specifications: North east, mid north coast and hunter regions. NSW State Forests, 31 ppGoogle Scholar
- Smith DM (1954) Maximum moisture content method for determining specific gravity of small wood samples. Report 2014, Forest Products Laboratory, Forest Service, US, Department of AgricultureGoogle Scholar