Growth Model of Schima superba in Guangdong Based on Tree Height-Age Classification

Based on the material of 90 strains of different diameter Schima superba felled in Guangdong, the growth model of different site grade of Schima superb was constructed. The site quality classification was determined by using the tree height-age model. A total of 4 empirical growth models were used to model the DBH, height and volume and the optimal model was selected by evaluating and comparing R_adj², ME, MAE and RMSE. The results showed that the best equations to simulate the growth process of DBH, tree height and volume were the equations of Gompertz. The optimal model of classified and unclassified method is different, the fitting models of using classified method in DBH, tree height, volume model were better than unclassified method.