Fibril angle of loblolly pine wood as related to specific gravity, growth rate, and distance from pith

McMillin, Charles W.

doi:10.1007/bf00351070

Cited by 23 publications

(25 citation statements)

References 2 publications

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“…Radial patterns of microfibril angle of the three cypress taxa were similar to those of other conifers, with the highest angles occurring in the first five growth rings (McMillin 1973, Zhang et al 2007, and like MFA of Pinus radiata (Moore et al 2014), the cypress taxa had comparable and low MFA values (Donaldson 1992). Mean MFA of the first five growth rings was 25°, 45°a nd 29°for Leyland, Lusitanica and Macrocarpa, respectively, while at age 25 years, mean MFA was estimated to be 11°, 14°and 13°for the three taxa, respectively.…”

Section: Discussionmentioning

confidence: 70%

“…Microfibril angle also varies with age, being higher nearer the pith and declining with increasing cambial age (McMillin 1973, Zhang et al 2007. The relationship between MFA and cambial age has been examined in many other studies, with a comprehensive list provided by Donaldson (2008) in a review of MFA measurement, variation and relationships.…”

Section: Introductionmentioning

confidence: 99%

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Radial variation in selected wood properties of three cypress taxa

Todoroki

Low

McKenzie³

et al. 2015

N.Z. j. of For. Sci.

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Background: New Zealand-grown cypresses are typically harvested at 35-40 years of age; however, shorter rotations have been proposed. The objective of this study was to evaluate the feasibility of producing structural products from shorter rotations through examination of wood properties of younger cypress trees. A detailed examination of radial wood property trends was necessary, and the first ring-level models for three cypress taxa were developed because there were no predictive wood property models available.

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Section: Discussionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Radial variation in selected wood properties of three cypress taxa

Todoroki

Low

McKenzie³

et al. 2015

N.Z. j. of For. Sci.

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“…A general pattern of density decrease immidiately adjacent to the pith followed by an increase towards bark which later diminishes is well established for Norway spruce (Olesen 1976, Johansson 1993, Danborg 1994, Pape 1999. The radial pattern of high microfibril angle near the pith, and the decrease and stabilisation towards a lower value for more mature wood has also been well described (McMillin 1973, Donaldson 1992, Shupe 1996, Lindström et al 1998, Saranpää et al 2000.…”

Section: Introductionmentioning

confidence: 80%

Microfibril angle and density patterns of fertilized and irrigated Norway spruce

Lundgren¹

2004

Silva Fenn.

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Two Norway spruce nutrient optimisation trials, one in the north of Sweden and one in the south, were used to study the effects of intensive growth and fertilization on wood density and microfibril angle. Three different treatments and a control were available; daily irrigation, daily liquid fertilization and solid fertilization. The nutrient optimisation was based on foliage analysis and the solid fertilization essentially comprised the same amount of nutrients but was applied annually in solid form. Measurements of density and microfibril angle (MFA) were performed using X-ray diffraction. Growth rate, expressed as a transformation of annual ring width, was very important at the southern site when the effect of cambial maturation had been taken into account. Effects of both fertilization and irrigation remained strong and significant for density, and irrigation was a significant factor explaining MFA. At the northern site distance from pith was the dominant factor but the effect of growth rate was also strong and the treatment effect was significant for both density and MFA. The combination of higher MFA and decrease in density for fertilized trees resulted in a lower calculated strength of the wood. An over 100% increase in ring width only corresponded to approximately a 20% decrease in wood density and the production of wood dry matter was hence increased by treatments.

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“…Many other authors (e.g. McMillin, 1973;Donaldson, 1992;Evans et al, 2000) have reported that MFA decreases with increasing height of the tree, increase in wood density and low rate of growth of trees. Therefore, in modeling the mechanical properties of wood, as well as its moisture deformation, not only the wood density and its microstructural parameters (shape and size of the cells) are taken into regard, but also the arrangement of microfibrils in the cell wall (Mark, 1967;Cowdrey and Preston, 1966;Cave, 1968Cave, , 1969Astley et al, 1998;Xu and Liu, 2004;Mishnaevsky and Qing, 2008).…”

Section: Introduction 1 Uvodmentioning

confidence: 93%