Characteristics of the Diameter Structure of Chinese Fir Stand in Huangfengqiao Forest Farm

With the Chinese fir artificial stand in Huangfengqiao Forest Farm, Hunan, as the researching subject, this article conducts the study of the stand diameter structure rules by using the method of relative diameter. It gives the characteristics of the relative diameter structure of this stand by means of analyzing and finding out the relations among the relative diameter, the normal distribution and the Weibull distribution.