Relationship Between Wood Density, Microfibril Angle and Stiffness in Thinned and Fertilized Pinus Radiata

Downes, Geoffrey M.; Nyakuengama, J. Gwinyai; Evans, Robert; Northway, Richard; Blakemore, P.; Dickson, Ross L.; Lausberg, Marco

doi:10.1163/22941932-90000302

Cited by 78 publications

(48 citation statements)

References 9 publications

(11 reference statements)

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“…The ring-width term in this model was positive and significant, indicating that there is a small positive effect of growth rate on MFA (Table 3). This is consistent with previous studies in other species (Auty et al 2013;Downes et al 2002;Herman et al 1999;Lindström et al 1998;Sarén et al 2004;Wimmer et al 2002) and indicates that treatments that increase growth rates could have a negative impact on wood stiffness.…”

Section: Resultssupporting

confidence: 93%

Modelling microfibril angle variation in New Zealand-grown radiata pine

Moore

Cown

McKinley

2014

N.Z. j. of For. Sci.

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Background: Microfibril angle (MFA) is a property of wood cell walls that has a strong influence on end-product quality, particularly for solid timber. Forest managers, tree breeders and wood processors require more quantitative information on the inter-and intra-stem variation in MFA in order to understand the impacts of their decisions on wood quality. The aim of this study was to develop parametric models that can be used to predict the intra-and inter-stem variation in MFA in radiata pine (Pinus radiata D. Don) trees growing in New Zealand

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Section: Resultssupporting

confidence: 93%

Modelling microfibril angle variation in New Zealand-grown radiata pine

Moore

Cown

McKinley

2014

N.Z. j. of For. Sci.

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“…In particular, between 1972 and 1981 approximately 100 000 ha in south west Scotland (Dumfries and Galloway) were treated with remedial fertiliser programmes in which up to a total of 1725 kg/ha of P and K and 350 kg/ha of N were applied in the first 12 years (Davies 1982). Previous studies which have investigated the effects of fertilisation on wood properties of radiata pine have shown that this results in a small decrease in MOE (Downes et al 2002, Watt et al 2006. However, in the latter study the 6 per cent decrease was not statistically significant.…”

Section: Discussionmentioning

confidence: 99%

The effects of site and stand factors on the tree and wood quality of Sitka spruce growing in the United Kingdom

Moore¹,

Lyon²,

Searles³

et al. 2009

Silva Fenn.

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The extent and sources of variation in the wood quality of Sitka spruce (Picea sitchensis (Bong.) Carr.) were quantified using data collected from 64 stands in northern Britain. These stands were selected on the basis of elevation, latitude, longitude, yield class, initial spacing and the presence or absence of thinning. Dynamic modulus of elasticity (MOE) was calculated from measurements of stress wave velocity made on standing trees and qualitative descriptions were made of stem form. Dynamic MOE of individual trees ranged from 3.81 kN/mm 2 up to 12.29 kN/mm 2 , with a mean of 7.71 kN/mm 2 . Approximately 55 percent of the variation in dynamic MOE was due to differences between individual trees within a site, while 35 percent was due to differences between sites. The remaining 10 percent was due to differences between the measurements made on opposite sides of each tree. Variation in dynamic MOE at the site level was significantly influenced by yield class, elevation as well as by a number of the interactions between these factors and latitude, longitude and initial spacing. A multiple regression model incorporating these variables was able to explain 45 percent of the variation in dynamic MOE. Ramicorn branches were the most commonly recorded defect (37.2% of all live trees), followed by stem scarring and basal sweep (6.9% and 6.3%, respectively). Dynamic MOE was not influenced by stem straightness (p = 0.10) which indicates the utility of stress wave velocity measurements for segregating Sitka spruce stands based on potential grade recovery.

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“…Theoretically, the microfibril angle has a predominant effect on wood stiffness (Cave 1966) and numerous studies had verified this argument using experimental data (Walker and Butterfield 1996, Downes et al 2002, Donaldson 2008. For Eucalyptus, Evans and Ilic (2001) reported that the density variation alone accounted for 70% of the variation in E. delegatensis samples, while the microfibril angle alone accounted for 86%.…”

Section: Correlations Among Wood Traitsmentioning

confidence: 93%

Correlations among microfibril angle, density, modulus of elasticity, modulus of rupture and shrinkage in 6-year-old Eucalyptus urophylla × E. grandis

Hein

Silva

Brancheriau

2013

Maderas, Cienc. tecnol.

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The cellulose microfibril angle (MFA) in the cell wall is known to have major effects on wood stiffness and shrinkage. However, its influence on juvenile wood traits is not fully understood, especially in Eucalyptus. The aim of this study was to evaluate the relationships among MFA, density (ρ), dynamic modulus of elasticity (E), modulus of rupture (MOR), and shrinkage (δ) in 6-year-old Eucalyptus urophylla × E. grandis. Small clear specimens (L 410 mm x R 25 mm x T 25 mm) were cut from central boards for the determination of E and MOR. Cubic samples (25 mm³) were removed after the dynamic and static tests to evaluate ρ and δ. MFA was finally measured by X-ray diffraction on small strips coming from the cubic samples. A quasi-absence of statistical link was found for MFA -δ and MFA -ρ (R²<0.20). The parameter ρ/MFA was used to estimate E (R²=0.66) and MOR (R²=0.37). In a next step, the additive and interaction effects were investigated using multiple linear regressions with a forward selection method. The property E was found to be linked only with the additive effects of ρ and 1/MFA (R²=0.76). The additive and interaction effects were all significant for MOR (R²=0.54). This study showed that a general model including both additive and interaction effects should be used for the prediction of the modulus of elasticity and the modulus of rupture.

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Relationship Between Wood Density, Microfibril Angle and Stiffness in Thinned and Fertilized Pinus Radiata

Cited by 78 publications

References 9 publications

Modelling microfibril angle variation in New Zealand-grown radiata pine

Modelling microfibril angle variation in New Zealand-grown radiata pine

The effects of site and stand factors on the tree and wood quality of Sitka spruce growing in the United Kingdom

Correlations among microfibril angle, density, modulus of elasticity, modulus of rupture and shrinkage in 6-year-old Eucalyptus urophylla × E. grandis

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