Abstract:

The basal growth prediction is a kernel factor and foundation in the model system of stand growth and yield prediction.Richards Growth Model including stand density index, age and site quality index was taken as basal area growth model.The functional relationship was developed between Crown Competition Factor (CCF)proposed by Krajicek et al.and stand density index by Reineke and number of trees per hectare by using the characteristic of CCF reflecting tree competition in stand to certain degree.Acco rding to the function, the conclusions for L.olgensis and C.lanceolata are as follows; 1)CCF < 200, showing stand growth with constant tree number; 2)200 ≤CCF ≤300, transition of growth from constant tree number to the self-thinning, in other words, the change of SDI(stand density index)can be described as linear combination of the growth with constant tree number and the self-thinning; (3)CCF > 300, stand growth in the self-thinning.

Key words: Crown competition factor, Basal area, Growth model, Thinning