Abstract: The growth characteristics of Picea mongolica seedling and the seasonal dynamics and distribution pattern of dry matter in its various organs during growing seasons are studied using different models. The results show that 1) the growth rate of annual seedlings, and of their root in particular, is much higher, but five years-old seedlings are near to the upper limit of growth, 2) the dry matter production of root, stem and leaf corresponds to Richards model, and the percentages of them to whole plant are different, which reflects the distribution pattern of dry matter in various organs, 3) the dynamics of dry weight of various organs in different years reflects the state of falling leaves and branches caused by self-thinning, and 4) the correlation coefficients simulated by models are almost at very significant level.

Key words: Picea mongolica, Growth pattern, Dry matter, Model