A simple stem taper model with mixed effects for boreal black spruce

被引:0
作者
Geneviève Lejeune
Chhun-Huor Ung
Mathieu Fortin
Xiao Jing Guo
Marie-Claude Lambert
Jean-Claude Ruel
机构
[1] Université Laval,Faculté de Foresterie et de Géomatique
[2] Natural Resources Canada,undefined
[3] Canadian Wood Fibre Centre,undefined
[4] Laurentian Forestry Centre,undefined
[5] Ministère des Ressources Naturelles et de la Faune du Québec,undefined
[6] Direction de la recherche forestière,undefined
来源
European Journal of Forest Research | 2009年 / 128卷
关键词
Random effects; Black spruce; Stem taper; Variable-exponent taper equation;
D O I
暂无
中图分类号
学科分类号
摘要
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.
引用
收藏
页码:505 / 513
页数:8
相关论文
共 35 条
[1]  
Beaumont JF(1999)Relating site index to ecological factors in black spruce stands: tests of hypotheses For Sci 45 484-491
[2]  
Ung C-H(1977)The whole-bole system: a conditioned dual-equation system for precise prediction of tree profiles Can J Res 7 488-497
[3]  
Bernier-Cardou M(1983)Smearing estimate: a nonparametric retransformation method J Am Stat Assoc 78 605-610
[4]  
Demaerschalk JP(2003)Modeling stem taper of three central Oregon species using nonlinear mixed effects models and autoregressive error structures For Ecol Manage 179 507-522
[5]  
Kozak A(1995)Linear modelling of irregularly spaced, unbalanced, longitudinal data from permanent-plot measurements Can J Res 25 137-156
[6]  
Duan N(2001)Modeling and prediction of forest growth variables based on multilevel nonlinear mixed models For Sci 47 311-321
[7]  
Garber SM(1988)A variable-exponent taper equation Can J Res 18 1363-1368
[8]  
Maguire DA(2008)A flexible regression model for diameter prediction Eur J For Res 127 415-428
[9]  
Gregoire TG(2006)A multivariate, non parametric stem-curve prediction method Can J Res 36 1017-1027
[10]  
Schabenberger O(2004)Improving taper equations of loblolly pine with crown dimensions in a mixed-effects modeling framework For Sci 50 204-212