A Study of Individual-tree Growth Models in Natural and Artificial Forests of Alnus cremastogyne

The rules of growth and development was calculated for natural and artificial forests of Alnus cremastogyne,which would lead to better management of forests.Based on the measured data of height and DBH,individual tree height-diameter models were developed for A.cremastogyne by analyzing the existing nine height-diameter models.The results showed that the values of R²,R_adj²,RMSE,ERMSE,ME,and MAE of the optimal height-diameter model were 0.79403,0.79217,0.886,0.045,0.00021,and 2.64125,respectively.The optimal growth model argument for individual trees of A.cremastogyne was DBH,the growth model was H=1.3+27.176×(D/(1+D))^11.856.The height-diameter model was biologically reliable for predicting the growth of A.cremastogyne in Sichuan province.