Journal of Environmental Biology

Generalized height-diameter models for Picea orientalis L.

 

Turan Sonmez*

Faculty of Forestry,? Artvin Coruh University, Artvin - 08000, Turkey

(Received: April 18, 2008; Revised received: September 29, 2008; Accepted: October 01, 2008)

 

Abstract: The purpose of this paper is to compare major models for height estimation of Picea orientalis L trees based on the individual tree diameter and certain other stand variables. The data were collected from 440 trees of pure and even-aged P. orientalis stands that are located near Artvin in the northeastern part of Turkey. The data from 406 trees were used for model development and the remaining data were reserved for model validation. A total of 17 non-linear models were fitted to 406 trees. Mean square errors and R² values for the 17 models showed that some models roduced similar height estimation. The model [8] gave the best height estimates for P. orientalis with the highest R² (0.8703) and the lowest mean square error (5.47). Validation of the models using independent data sets showed that model [8] and [16] gave the best height predictions for this particular dataset.

Key words: Generalized diameter-height equations, Model evaluation and validation, Oriental spruce

 

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