Abstract: Given the stand factors of subcompartment, such as mean height and mean diameter of various tree species composed stand, age, number of stems per hectare, crown density, volume of open grown tree, the forest resource data of subcompartment without human disturbance could be updated completely and predicted continually by using natural stand growth models. These models were of taking composing tree species as updating basis, with site class index representing site quality of a subcompartment, with prediction interval substituting age, and more suitable for updating the data in the natural mixed-species and uneven-aged subcompartment. Based on 108 permanent plots from Wangqing Forest Bureau in Jilin Province, the test results showed that the predictions by using the natural stand growth models were better than those by using growth rate in production units at present.

Key words: Narural stand, Growth model, Subcompartment, Update