Modeling Primary Branch Diameter and Length for Planted Pinus koraiensis by Incorporating Neighbor Competition in Northeast China

Korean pine (Pinus koraiensis Sieb. et Zucc.) is the most important forest vegetation in northeast China. The timber quality of this tree species largely driven by branch growth and distribution within crown. Thus, developing diameter length models, especially those that include competition indices, essential. A total 48 trees were selected to conduct destructive measurements characteristics. This was carried out on all live branches, a model developed. Various including absolute depth into base (DINC) from tip, used. equation with largest Radj2 smallest root mean square error (RMSE) values as best model. Each parameter reparameterized variables indices. Finally, included at breast height (DBH), (HT), crown index (CLI), DBH HT exhibited performance. RMSE 0.42 4 mm, respectively, for model, 0.77 63 cm, Branch increased decreased increased. Furthermore, CLI