Abstract: In this paper, a self-adaptive and general model (SGM) ds/dt=rs(1-s^θ/k^φ) was proposed to approach the growth dynamics of tree basal area of Castanopsis kawakamii population, which includes Logistic model, Smith's model, Gompertz's model, Cui-Lawson's model and Zhang's Logistic model.The method of modified simplex was applied to optimize the SGM, and the fitting results show that SGMwas more suitable than Logistic model to the actual growth trend of C.kawakamii population, and that the highest growth rate of basal area was in147 years.

Key words: Castanopsis kawakamii, Dominance, Self adaptive and general model, Modified simplex, water use efficiency, grain yield, dry matter accumulation and allocation, tillage practices, photosynthetic characteristics