Abstract: The individual growth dynamics of Betula platyphylla Suks population in north of Shaanxi province have been analyzed at different levels according to concordant spectrum principle and method of spectrum analysis. The result shows that the growth of the height, breast height diameter and volume of Betula platyphylla population individuals are not suited to the model of the Logistic regulation of general plant growth. The height growth regulation coincide with Logistic only after 20 years old;the growth of breast height diameter is totally different from Logistic model;however, the volume growth suits to the Logistic model. The spectrum analysis is an efficient method to analyze the growth process of woody plant compared with Logistic model.

Key words: Betula platyphylla, concordant spectrum analysis, growth process