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根据固定标准地调查材料，对中幼林杉木胸高断面积及胸径的自然生长进行分析表明：不同立地指数的杉木林分，其断面积及胸径自然生长是一组扩展的Ｒｉｃｈａｒｄｓ函数的多形曲线。
According to the data of a fixed standard survey, the analysis of the natural area of breast height and DBH of young and old Chinese fir showed that the growth of the Chinese fir stands with different site indexes and the natural growth of DBH were polymorphic curve of Richards function.