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iForest - Biogeosciences and Forestry

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Modeling compatible taper and stem volume of pure Scots pine stands in Northeastern Turkey

Burak Saygili (1), Aydin Kahriman (2)   

iForest - Biogeosciences and Forestry, Volume 16, Issue 1, Pages 38-46 (2023)
doi: https://doi.org/10.3832/ifor4099-015
Published: Jan 22, 2023 - Copyright © 2023 SISEF

Research Articles


Compatible taper and volume equations for pure and natural Scots pine stands in the northeastern part of Turkey (Ardahan Province) were developed using a nonlinear mixed-effects modeling approach. Experimental data were obtained from 137 felled sample trees in different diameter and height classes. The most successful model (Jiang et al. 2005) explained 98.3% of the variance in stem diameter estimation and the RMSE, ME, MAE, AIC and BIC value obtained using this model were 1.955 cm, 0.043 cm, 1.300 cm, 9783.8 and 9812.6, respectively. Considering the criterion values of AIC, BIC and -2LnL, the model with random-effects in two parameters (b1 and b3) was the most successful for Scots pine. While the mixed model including random parameters did not completely solved the problem of the autocorrelation of errors in this study, the use of the autoregressive error structure AR(1) eliminated the autocorrelation in the residuals. In addition, the best estimation results among 20 different calibration options were obtained using the option of measuring two tree diameters at d1.30 and d5.30 with validation data. The most successful model explained 99.18% of the total variance in stem volume estimation in Scots pine.

  Keywords


Nonlinear Mixed-effects Model, Segmented Polynomial Taper Models, Calibration, Random Parameters, Autocorrelation, Stem Volume

Authors’ address

(1)
Burak Saygili 0000-0003-0106-0550
Erzurum Regional Directorate Ardahan Forest District Directorate, 75000, Ardahan (Turkey)
(2)
Aydin Kahriman 0000-0001-9696-1153
Artvin Çoruh University Faculty of Forestry, Department of Forest Engineering, 08100, Artvin (Turkey)

Corresponding author

 
Aydin Kahriman
kaydin61@hotmail.com

Citation

Saygili B, Kahriman A (2023). Modeling compatible taper and stem volume of pure Scots pine stands in Northeastern Turkey. iForest 16: 38-46. - doi: 10.3832/ifor4099-015

Academic Editor

Carlotta Ferrara

Paper history

Received: Mar 11, 2022
Accepted: Nov 07, 2022

First online: Jan 22, 2023
Publication Date: Feb 28, 2023
Publication Time: 2.53 months

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