Height to Crown Base Modelling for the Main Tree Species in an Even-Aged Pedunculate Oak Forest

The height to crown base (hcb) is a critical measure used in many investigations as an input variable investigate the vigour of stands, social position trees, and evaluate behaviour forest fires, among other uses. Though measuring height-related variables field always time-consuming, foremost benefits offered by modelling hcb are that it permits generalize average very uneven attribute and, furthermore, provides insights about which tree stand have significant impact on hcb. However, there species models not been developed Croatia. objective this research was develop model for each main present two-layered mixed stands study. According previous investigations, logistic provide highest precision require lowest inventory cost owing less frequent measurements. Tree- plot-level with distance-independent competition indexes were studied fitting model. In research, we obtained species: Acer campestre (root mean squared error (RMSE) = 2.28 m, R2 82.80%); Alnus glutinosa (RMSE 1.78 85.36%); Carpinus betulus 2.47 67.55%); Fraxinus angustifolia 2.46 82.45%); Quercus robur 2.60 80.57%); Tilia sp. 2.01 R 2 89.07%); Ulmus laevis 1.71 92.42%). combination total height, tree, contributed prediction accuracy proposed significantly.