LejeuneUngFortinEtAl2009

Reference

Lejeune, G., Ung, C.-H., Fortin, M., Guo, X.J., Lambert, M.-C., Ruel, J.-C. (2009) A simple stem taper model with mixed effects for boreal black spruce. European Journal of Forest Research, 128(5):505-513. (Scopus )

Abstract

We simplified Kozak's taper model by setting the inflection point at 1.3 m (dbh) without losing accuracy and precision. The simplification was required to facilitate the estimation of the covariance parameters when using a mixed-effects method. This method was necessary to take into account the correlation among multiple diameter measurements on an individual stem. The simple stem taper model was fitted to an extended data set collected across the province of Quebec, Canada. Comparison of the predicted stem taper and the derived stem volume with those obtained using existing models showed a comparable predictive power for the simple model. Including a prediction of the tree random effects based on supplementary diameter measurements of the bole improves the predictive ability of the model around the extra diameter observation. This model offers welcome simplicity as a means of predicting tree taper at coarse resolution for planning tree harvesting. © The Author(s) 2009.

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@ARTICLE { LejeuneUngFortinEtAl2009,
    AUTHOR = { Lejeune, G. and Ung, C.-H. and Fortin, M. and Guo, X.J. and Lambert, M.-C. and Ruel, J.-C. },
    TITLE = { A simple stem taper model with mixed effects for boreal black spruce },
    JOURNAL = { European Journal of Forest Research },
    YEAR = { 2009 },
    VOLUME = { 128 },
    PAGES = { 505-513 },
    NUMBER = { 5 },
    ABSTRACT = { We simplified Kozak's taper model by setting the inflection point at 1.3 m (dbh) without losing accuracy and precision. The simplification was required to facilitate the estimation of the covariance parameters when using a mixed-effects method. This method was necessary to take into account the correlation among multiple diameter measurements on an individual stem. The simple stem taper model was fitted to an extended data set collected across the province of Quebec, Canada. Comparison of the predicted stem taper and the derived stem volume with those obtained using existing models showed a comparable predictive power for the simple model. Including a prediction of the tree random effects based on supplementary diameter measurements of the bole improves the predictive ability of the model around the extra diameter observation. This model offers welcome simplicity as a means of predicting tree taper at coarse resolution for planning tree harvesting. © The Author(s) 2009. },
    COMMENT = { Export Date: 2 October 2009 Source: Scopus doi: 10.1007/s10342-009-0300-8 },
    ISSN = { 16124669 (ISSN) },
    KEYWORDS = { Black spruce, Random effects, Stem taper, Variable-exponent taper equation, data set, estimation method, harvesting, tree, Canada, North America, Quebec [Canada], Picea mariana },
    OWNER = { Luc },
    TIMESTAMP = { 2009.10.02 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-69049110827&partnerID=40 },
}

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