Investigating diameter-height models of Brant's oak (Quercus brantii Lindl) in height forests of Middle Zagros

Articles in Press

Document Type : Scientific article

Authors

1 Associate Professor at Lorestan University, Lorestan, IRAN

2 PHD student of forest management, Faculty of Agriculture and Natural Resources, Lorestan University, Khorramabad, Iran.

3 Lorestan university

Abstract

Measuring the height of all forest trees is a time-consuming and expensive operation, therefore the use of diameter and height models has been developed to estimate the height of trees. The aim of this research is to investigate the regresion models of Brant's oak (Quercus brantii Lindl) in the coniferous forests of Middle Zagros. by conducting numerous forest tours and getting to know the forests of the region, a mass with an area of approximately 5 hectares with a height vegetation structure was selected in the protected area of Sefid Koh Lorestan. the characteristics of DBH and total height of all Brant's oak trees whose DBH was more than 12.5 cm were counted 100%. A total of 638 trees were measured. 80% of the data was used for modeling and 20% for validation. Using 24 regression models, the relationship between height as a dependent variable and diameter as an independent variable was examined and analyzed. In order to determine the best model, RMSE, MAE, Bias, AIC and R2 criteria were used. The obtained results showed that the three models of Gompertz, MMF and Richard with the explanation coefficient of 0.86 and RMSE% of 22.19, 22.20 and 22.20% respectively, the results are similar and close to They also had and were able to better estimate the height of trees. These models can be used to estimate the height of Brant's oak height trees in the forest areas of the Middle Zagros vegetation zone, which have similar structures and conditions.

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Main Subjects

Forest Research and Development

Articles in Press, Accepted Manuscript
Available Online from 16 February 2024

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