Growth models for natural Quercus mongolica forests——Ⅰ.Diameter growth model
[Objective] This paper predicted the growth and development of Quercus mongolica forests to provide foundation for the reasonable management.[Method] The data used to develop individual tree diameter growth model for natural Quercus mongolica forests were collected from 195 re-measured permanent sample plots in Wangqing Forest Bureau,Jilin Province.Based on analyzing the relationship between diameter square increment of individual tree with competitive factor,tree size factor,and site factor and the major independent variables,individual tree growth model for Quercus mongolica forests was developed using stepwise regression method.[Result]Determination coefficient R2,forecast precision,ME,MAE,RMSE,and ERMsE of the established model were 0.567,98.95％,4.792 7E-5 cm2,0.651 2 cm2,0.842 1 cm2,and 0.255 2,respectivley.[Conclusion] Main variables influencing diameter increment of individual tree included initial diameter at breast height and competition factor,while site factor had minor effect.The model was simple and precise,and could be easily applied for diameter growth projection of single tree in Quercus mongolica forests in Wangqing region of Jilin Province.
natural Quercus mongolica forestcomposite methodindividual-tree diameter growth model
NETL
NSTL
万方数据
维普
