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  • 1.
    Lundqvist, Sven-Olof
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Grahn, Thomas
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Olsson, Lars
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Seifert, Thomas
    Stellenbosch University, South Africa.
    Comparison of wood, fibre and vessel properties of drought-tolerant eucalypts in South Africa2017In: Southern Forests, a journal of forest science, ISSN 2070-2620, E-ISSN 2070-2639, Vol. 79, no 3, p. 215-223Article in journal (Refereed)
    Abstract [en]

    Three drought-tolerant eucalypt genotypes have been investigated for a broad spectrum of properties to provide a basis for comparison on their suitability for various end-uses. The genotypes included were a Eucalyptus grandis × E. camaldulensis hybrid, E. gomphocephala and E. cladocalyx, selected based on previous studies that indicated good potential to tolerate arid conditions, reasonably good volume growth and straightness of stems. In this study, information was added on differences between species and parts of stems in growth (volume and biomass) and properties of wood (density and stiffness), fibres (dimensions and microfibril angle) and vessels (size and numbers). We found high wood densities and stiffness values for E. cladocalyx and E. gomphcephala, making them suitable for construction wood. Logs from the mid-part of the stem had the best timber properties, as the butt logs showed the highest microfibril angle and lowest wood stiffness due to longitudinal juvenility. Such juvenility was also to some degree observed for wood density and fibre length. The information gained will be especially helpful for selecting species and processing options for small farm and community plantations for producing higher-value products that may be sold to generate much-needed income as well as for local uses, such as fuelwood and charcoal. © 2017 The Authors

  • 2.
    Phiri, Darius
    et al.
    Stellenbosch University, South Africa.
    Ackerman, Pierre
    Stellenbosch University, South Africa.
    Wessels, Brand
    Stellenbosch University, South Africa.
    du Toit, Ben
    Stellenbosch University, South Africa.
    Johansson, Marie
    Linnaeus University, Sweden.
    Säll, Harald
    Linnaeus University, Sweden.
    Lundqvist, Sven-Olof
    RISE, Innventia.
    Seifert, Thomas
    Stellenbosch University, South Africa.
    Biomass equations for selected drought-tolerant eucalypts in South Africa2015In: Southern Forests, a journal of forest science, ISSN 2070-2620, E-ISSN 2070-2639, Vol. 77, no 4, p. 255-262Article in journal (Refereed)
    Abstract [en]

    In the water-scarce environment of South Africa, drought-tolerant eucalypt species have the potential to contribute to the timber and biomass resource. Biomass functions are a necessary prerequisite to predict yield and carbon sequestration. In this study preliminary biomass models for Eucalyptus cladocalyx, E. gomphocephala and E. grandis · E. camaldulensis from the dry West Coast of South Africa were developed. The study was based on 33 trees, which were destructively sampled for biomass components (branchwood, stems, bark and foliage). Simultaneous regression equations based on seemingly unrelated regression were fitted to estimate biomass while ensuring additivity. Models were of the classical allometric form, ln(Y) = a+x1ln(dbh)+x2ln(h), of which the best models explained between 70% and 98% of the variation of the predicted biomass quantities. A general model for the pooled data of all species showed a good fit as well as robust model behaviour. The average biomass proportions of the stemwood, bark, branches and foliage were 60%, 6%, 29% and 5%, respectively.

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