Nonlinear mixed model approaches to estimating merchantable bole volume for Pinus occidentalis
S Bueno-López (1) , E Bevilacqua (2)
iForest - Biogeosciences and Forestry, Volume 5, Issue 5, Pages 247-254 (2012)
doi: https://doi.org/10.3832/ifor0630-005
Published: Oct 24, 2012 - Copyright © 2012 SISEF
Research Articles
Abstract
The ability to predict cumulative bole volume to any predefined upper stem diameter on a standing tree is essential for estimating current inventory levels and making informed decisions regarding the management of forest resources. Several types of mathematical models have been developed to predict cumulative bole volume, requiring only the collection of low cost data but high accuracy tree measurements. This paper reports on the comparison of a variable-exponent taper model and a volume-ratio model for estimating inside-bark cumulative bole volume to three predefined upper stem diameters using stem analysis data Pinus occidentalis trees in La Sierra, Dominican Republic. Each sampled tree was measured at multiple points on the bole, making observations spatially correlated within the tree. Inference problems due to autocorrelation were addressed by using a nonlinear mixed-effects model fitted by restricted maximum likelihood (REML) and including two random parameter coefficients at tree level in each of the two models tested. Using an independent validation data set, the variable-exponent taper model with two random parameters demonstrated better predictive ability as compared to the volume-ratio model when estimating cumulative bole volume to the three predefined upper stem diameters. The taper model allows flexible volume estimation for the population average as well for specific trees.
Keywords
Nonlinear Mixed-effects Models, Restricted Maximum Likelihood, Taper Model, Volume-ratio Model, Random Coefficients, Calibration, Pinus occidentalis
Authors’ Info
Authors’ address
Vicerrectoría de Investigaciones e Innovación, Pontificia Universidad Católica Madre y Maestra, Autopista Duarte km 1.500, Santiago de los Caballeros (República Dominicana)
State University of New York, College of Environmental Science and Forestry, 1 Forestry Drive, 13210 Syracuse, NY (USA)
Corresponding author
Paper Info
Citation
Bueno-López S, Bevilacqua E (2012). Nonlinear mixed model approaches to estimating merchantable bole volume for Pinus occidentalis. iForest 5: 247-254. - doi: 10.3832/ifor0630-005
Academic Editor
Marco Borghetti
Paper history
Received: Sep 07, 2012
Accepted: Oct 01, 2012
First online: Oct 24, 2012
Publication Date: Oct 30, 2012
Publication Time: 0.77 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2012
Open Access
This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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