Fitting and evaluation of height-diameter models for Alnus japonica in La Trinidad, Benguet, Philippines Fitting and evaluation of height-diameter models for Alnus japonica in La Trinidad, Benguet, Philippines

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Vol15 No.11: 2422-2432

Title】Fitting and evaluation of height-diameter models for Alnus japonica in La Trinidad, Benguet, Philippines

Author】Kamae P. ANACIOCO1; Judy Ann L. GORIO1; Mary Relia S. PADSICO1; Roscinto Ian C. LUMBRES1; Nova D. DOYOG1; Young Jin LEE2*

Addresses】1 College of Forestry, Benguet State University, La Trinidad, Benguet, 2601, Philippines; 2 Department of Forest Resources, College of Industrial Science, Kongju National University, Yesan-eup, Yesan-gun, Chungnam 34-370, Republic of Korea

Corresponding author】Young Jin LEE

Citation】Anacioco KP, Gorio JAL, Padsico MR, et al. (2018) Fitting and evaluation of height-diameter models for Alnus japonica in La Trinidad, Benguet, Philippines. Journal of Mountain Science 15(11). https://doi.org/10.1007/s11629-018-4866-9

DOI】https://doi.org/10.1007/s11629-018-4866-9

Abstract】The study was conducted to develop height-diameter at breast height (HT-DBH) models forAlnus japonica in La Trinidad, Benguet, Philippines and evaluate their predictive capability.The six widely used nonlinear growth models that were selected in this study were the Chapman-Richards, Schnute, Modified logistic, Korf/Lundqvist, Weibull and Exponential. A total of 208 Alnus japonica trees were measured using standard diameter tape for DBH(1.3 m above the ground) and Vertex and transponder was used for the total height measurement. The performance of the developed models were evaluated using the fit statistics including coefficient of determination (R2), root mean square error (RMSE), mean bias (Ē), absolute mean difference (AMD), and Akaike Information Criterion (AIC). The lack-of-fit statistics was also performed for further evaluation of the performance of the models. Based on the evaluation criteria, all six models were able to determine the DBH-height relationships and fitted the data well. Using the rank analysis, the Weibull HT-DBH model had the best performance among the six commonly used nonlinear growth models.The results of this study will help forest managers especially in La Trinidad, Benguet to easily predict the total height using the Weibull model for Alnus japonica utilizing the DBH as the predicting variable.

Keywords】Height- DBH model;Alnus japonica;Rank analysis;La Trinidad;Benguet;Philippines