Diameter growth prediction for individual Pinus occidentalis Sw. trees
S Bueno-López (1) , E Bevilacqua (2)
iForest - Biogeosciences and Forestry, Volume 6, Issue 4, Pages 209-216 (2013)
doi: https://doi.org/10.3832/ifor0843-006
Published: May 27, 2013 - Copyright © 2013 SISEF
Research Articles
Abstract
Predictive equations calibrated with remeasurement data from 25 permanent plots having individually identified trees were used to project stem diameter of Pinus occidentalis Sw. in Dominican Republic. The general form of the models used to fit the growth and yield functions included fixed effect covariates related to three subsets of explanatory variables: initial tree size, stand attributes, and competition indexes. The subsets were incrementally added in a stepwise fashion for each of the three response variables and the intercept of the model was allowed to vary randomly between plots. The models evaluated included a yield function that predicted future diameter at year t (dt), a periodic annual increment model using five-year diameter increment (id5) and its natural log transformation [ln(id5+0.01)]. For trees that were not remeasured exactly 5 years after the first measurement, id5 was computed by averaging the mean annual increment nearest the 5 year point and multiplying by five. Each approach was evaluated using an independent validation data set based on seven goodness-of-fit statistics, graphical display of residuals and the variance components of each model combination. LMM, including fixed and random parameters, provided a better fit among the models tested. For estimating future diameter, accuracy of predictions is within one centimeter for a five-year projection interval, and bias is negligible. All the models had moderately improved fit statistics when random effects were included in the evaluation. The degree of improvement behaved in a similar manner for most fit statistics, with differences in the range of values for MSE, RMSE and RMSE% of 0.53, 0.23 and 1.05, respectively. The absolute difference between the extreme values for Bias and relative Bias (%) in all the models was 0.20 and 0.92. The differences in values for MAD were only 0.15 and R2 values were practically equivalent.
Keywords
Repeated Measurements, Mixed Models, Stepwise Regression, Site Quality, Individual Tree Competition Indexes
Authors’ Info
Authors’ address
Vicerrectoria de Investigaciones e Innovación, Pontificia Universidad Catolica Madre y Maestra, Santiago de los Caballeros (Dominican Republic)
College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, 13210 Syracuse, NY (USA)
Corresponding author
Paper Info
Citation
Bueno-López S, Bevilacqua E (2013). Diameter growth prediction for individual Pinus occidentalis Sw. trees. iForest 6: 209-216. - doi: 10.3832/ifor0843-006
Academic Editor
Marco Borghetti
Paper history
Received: Oct 26, 2012
Accepted: Mar 06, 2013
First online: May 27, 2013
Publication Date: Aug 01, 2013
Publication Time: 2.73 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2013
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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