Site Relationships for Some Wood Properties of Pine Species in Plantation Forests of Southern Africa

Schutz, C. J.; Christie, S. I.; Herman, Bernard L.

doi:10.1080/00382167.1991.9629080

Cited by 10 publications

(4 citation statements)

References 5 publications

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“…This result is consistent with other studies on sessile oak growth (Becker et al, 1994;Lebourgeois et al, 2004) and several studies on conifer wood density (Lassen and Okkonen, 1969;Cown and Parker, 1978;Becker, 1982;Schultz et al, 1991). In our study, altitude remained significant but its part of variance decreased after LP was statistically controlled; this meant that altitude had a direct effect on wood density and an indirect effect via latewood proportion.…”

Section: Influence Of Climate On Wood Densitysupporting

confidence: 95%

Effects of ecological factors on radial growth and wood density components of sessile oak (Quercus petraea Liebl.) in Northern France

Bergès¹,

Nepveu²,

Franc³

2008

Forest Ecology and Management

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Section: Influence Of Climate On Wood Densitysupporting

confidence: 95%

Effects of ecological factors on radial growth and wood density components of sessile oak (Quercus petraea Liebl.) in Northern France

Bergès¹,

Nepveu²,

Franc³

2008

Forest Ecology and Management

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“…This confirms the findings of Dvorak et al (2000a) on the advantages of P. tecunumanii hybrids. The general MOE dym shows that sites at a lower elevation had higher MOE dym than those at higher altitude, which concurs with other reports that there is an inverse relationship between some wood-quality properties and elevation (Schutz et al 1991;McCallum et al 2007). Pinus patula × P. tecunumanii LE met the minimum requirement for MOE dym as specified by the SANS standard.…”

Section: Discussionsupporting

confidence: 80%

Growth and dynamic modulus of elasticity of Pinus patula × Pinus tecunumanii hybrids in Mpumalanga, South Africa

Hongwane

Mitchell²,

Kanzler

et al. 2016

Southern Forests: a Journal of Forest Science

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Field establishment of South Africa's most important commercial pine species, Pinus patula, is severely hampered by the pitch canker fungus, Fusarium circinatum. Importantly, hybrids between P. patula and other pine species tolerant to the pitch canker fungus, such as P. tecunumanii and P. oocarpa, have been identified as an alternative planting stock. In this study, variation in tree volume and dynamic modulus of elasticity (MOE dym ) of the P. patula × P. tecunumanii (low-and high-elevation [LE and HE] ecotypes) hybrid was compared with the P. elliottii × P. caribaea hybrid, and the pure species P. tecunumanii (LE) and P. patula. The MOE dym was assessed using the Fakkop TreeSonic microsecond instrument across three sites. The results of the study showed that P. patula × P. tecunumanii LE performed significantly better than P. patula × P. tecunumanii HE for volume and MOE dym , which in turn was significantly better than P. patula. The MOE dym and tree growth decreased with an increase in elevation. There was significant taxon × site interaction for volume and MOE dym . The results of these trials suggested that P. patula × P. tecunumanii LE is a suitable alternative to P. patula in the Sabie region of Mpumalanga in South Africa on frost-free sites, in terms of the traits that were assessed.

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“…More heart shake was found present at sites with high manganese content in the A-horizon. A far higher incidence of heart shake occurred on wetter and poorly-drained of the two sites studied by Schutz et al (1991). A good relationship was found between the formation oftraumatic resin ducts, poor drainage and the hormone Southern African Forestry Journal -No.…”

Section: Introductionmentioning

confidence: 66%

Variation in the Incidence of Resin-filled Shakes and Wood Density among Open-pollinated Families ofPinus elliottiiPlanted at Four Different Sites

Malan¹

1998

The Southern African Forestry Journal

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SYNOPSISA study on the incidence and severity of resin-filled shakes was carried out on 36 open-pollinated families established at four different sites. The objectives were to study the distribution of shakes within and between trees, and how it is affected by genetics and environment.In general a clear pattern in the variation among families was observed suggesting that there is some genetic influence. However, between the four different sites the among-family patterns of variation in resin shake propensity, differences between trees within families, and the distribution within tree stems, were extremely variable and inconsistent. From this it is evident that some genotypes seem to respond differently to the influences of environment. Resin shakes often occurred in the basal part of the tree stem, often extending into the stump, but the frequency of occurrence varied considerably between sites. Shakes occurring higher up in the stem were often associated with large knots, knot clusters and forks.The trees sampled at about sea level exhibited a much lower incidence of resin shakes and produced wood of much higher density than the trees sampled at higher altitudes, but no direct relationship of any significance between the incidence of resin shakes and these factors could be found. No relationship could also be found between differences in shake intensity among individual trees and differences in wood density.A study aimed at understanding the relationship between resin shake formation, fracture energy and the shear strength of the wood, and the factors controlling shear strength, is proposed. Such information would be an important requirement for developing an effective breeding strategy aimed at manipulating those wood properties affecting the shear strength of the stem.

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Site Relationships for Some Wood Properties of Pine Species in Plantation Forests of Southern Africa

Cited by 10 publications

References 5 publications

Effects of ecological factors on radial growth and wood density components of sessile oak (Quercus petraea Liebl.) in Northern France

Effects of ecological factors on radial growth and wood density components of sessile oak (Quercus petraea Liebl.) in Northern France

Growth and dynamic modulus of elasticity of Pinus patula × Pinus tecunumanii hybrids in Mpumalanga, South Africa

Variation in the Incidence of Resin-filled Shakes and Wood Density among Open-pollinated Families ofPinus elliottiiPlanted at Four Different Sites

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