Abstract: The Stand Density Index (SDI) was introduced as a measure of stand density for the natural forest to reflect the competition level between trees in natural forest area. The Site Class Index (SCI) was used for replacing site index to reflect the site quality of natural forest. The Schumacher growth function was selected as base model for developing stand growth and yield model for natural forests including basal area growth model,stand volume model,canopy density model and mortality volume model. From the fitting and validation,the models performed well.

Key words: natural mixed forests, whole stand models, Schumacher growth function, Daxing’anling Mountains