2 results for Alzamora, R.M.

  • Hedonic prices for structural wood attributes of radiata pine logs in New Zealand

    Alzamora, R.M.; Apiolaza, L.A. (2009)

    Conference Contributions - Published
    University of Canterbury Library

    This paper presents an estimation of the economic values of attributes for the production of structural timber from Pinus radiata logs. A hedonic prices approach was used to obtain economic values, using conversion return instead of log price as the dependent variable. A comparison between these log values is presented to illustrate the pertinence of the conversion return for the purposes of this study. Data were provided by the Wood Quality Initiative as a sample of 71 second and third unpruned logs. Attributes included in the hedonic models were small end diameter, stiffness, basic density, and branches and the corresponding hedonic prices were 0.11, 0.029, 0.37 and -0.55 NZ $/m3 respectively. Additionally, an efficiency analysis was used to identify the mix of wood attributes that define an efficient log for structural purposes, from a technical and economic point of view. The application of data envelopment analysis showed that a third log is the most efficient to produce structural grade MSG8+. This log also presented the highest difference between conversion return and its corresponding price. Trends observed in the cost efficiency index, as well as correlations between this and the log conversion return were useful for validating the economic values of the wood attributes.

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  • A hedonic price analysis of radiata pine logs for appearance timber

    Alzamora, R.M.; Apiolaza, L.A. (2010)

    Journal Articles
    University of Canterbury Library

    This study used a hedonic approach to estimate the economic value of radiata pine log attributes (small-end diameter, form and internode length) for appearance grade lumber, including Moulding & Better, Shop and Industrial Finger Joint. Models were also built at the tree level to investigate the effect of selection as conducted by breeders. A Chilean sawing study provided information on wood traits and log out-turn for 156 logs divided into three classes: pruned butt log, second log and third log. The conversion return of logs, instead of log prices, was used as the measure of log economic value. The economic values of log small-end diameter were 0.33, 0.19 and 0.10 US $/mm for the first, second and third log respectively. Concerning form, those values were 2.6, 1.4 and 0.63 US $ for a marginal improvement of this characteristic. The value of mean internode length was 0.19 US $/cm for second unpruned logs. Values for other internode length indices are also presented in this paper. Branch variables were not statistically significant in explaining the log recovery value. Finally, log recovery value was found to be elastic to the changes in small-end diameter and form, but inelastic to changes in the mean internode length.

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