Articles by Author: Francois S Malan

Search results for Francois S Malan

We found 106 results for you
  1. Variation in strength, stiffness and related wood properties in young South African-grown <em>Pinus patula</em>

    Variation in strength, stiffness and related wood properties in young South African-grown <em>Pinus patula</em>

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    The objective of this study was to examine the variation in and intercorrelation among wood properties determining the suitability of 16- to 20-year-old South African-grown Pinus patula trees for structural timber. A total of 1 112 sawn boards from 340...
  2. The variation of microfibril angle in South African grown <em>Pinus patula</em> and its influence on the stiffness of structural lumber

    The variation of microfibril angle in South African grown <em>Pinus patula</em> and its influence on the stiffness of structural lumber

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Reduction in the rotation ages of softwood saw-log plantations in South Africa is causing increased proportions of low stiffness sawn lumber at final harvest. It has been shown for some species that the microfibril angle (MFA) of the S2 layer...
  3. Family variation in diameter growth and acoustic velocity in three 5‑year‑old South African‑grown <em>Pinus elliottii</em>×<em>Pinus caribaea</em> progeny trials established on three diverse sites

    Family variation in diameter growth and acoustic velocity in three 5‑year‑old South African‑grown <em>Pinus elliottii</em>×<em>Pinus caribaea</em> progeny trials established on three diverse sites

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    This paper discusses family differences in the stiffness of young Pinus elliottii×P. caribaea wood and how these differences relate to differences in growth rate and altitude. Trees for measurement were obtained from three 5‑year‑old progeny trials established at three diverse...
  4. Securing African forests for future drier climates: applying ecophysiology in tree improvement

    Securing African forests for future drier climates: applying ecophysiology in tree improvement

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Increasing incidences of drought-induced tree mortality are being recorded worldwide, including Africa. African forests cover a significant proportion of the continent, which implies that African forest sustainability is threatened from a climate-change perspective. This is especially problematic in a developing...
  5. Variation in selected solid wood properties of young <em>Pinus patula</em> from diverse sites in the Mpumalanga escarpment area in South Africa

    Variation in selected solid wood properties of young <em>Pinus patula</em> from diverse sites in the Mpumalanga escarpment area in South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Regression analyses identified ‘Growth Days’ (an index expressing site moisture availability) as the only site variable contributing significantly to the prediction to wood density (R2 = 0.57), whereas the model predicting grain angle included only ‘Altitude’ (R2 = 0.60). These...
  6. BOOK REVIEWS

    Item type: Journal Article • Journal: South African Forestry Journal
  7. Genetic Variation in Some Growth and Wood Properties among 18 Full-sib Families of South African <em>Grown Eucalyptus grandis:</em> A Preliminary Investigation

    Item type: Journal Article • Journal: South African Forestry Journal
    Estimates of the genetic parameters for a number of tree and wood properties were obtained using 18 controlled pollinated families selected for rapid growth from a 9-year-old progeny trial consisting of 71 controlled pollinated families and one commercial control. Significant...
  8. Wood Property Variation in Six <em>Pinus radiata</em> (D. Don) Trees Grown in the Jonkershoek State Forest

    Item type: Journal Article • Journal: South African Forestry Journal
    The sources of variation, their relative contribution to the total and random variation, and the general pattern of variation were investigated for total ring width, latewood width, latewood percentage, grain angle, basic density and fibre length.
  9. Direct Gamma Ray Densitometry of Wood

    Item type: Journal Article • Journal: South African Forestry Journal
    Wood density was determined in various wood species representing a wide range of densities using 60 KeV collimated soft gamma radiation from an Americium241 energy source. In the samples examined wood mass attenuation coefficients varied from 0,170 to 0,210 cm2g...
  10. Variation, Association and Inheritance of Juvenile Wood Properties of <em>Eucalyptus grandis</em> Hill ex Maiden with Special Reference to the Effect of Rate of Growth

    Item type: Journal Article • Journal: South African Forestry Journal
    In South Africa existing knowledge on the properties of the juvenile wood of Eucalyptus grandis, their variation and intercorrelation is seriously lacking and not in accordance with the species commercial importance. Such information is important because of the fact that...