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通过对立地因子进行数量化分析，把立地划分为三个等级，运用ＲＩＣＨＡＲＤＳ生长曲线对候选树的胸径、树高和材积进行拟合，分别地位级求出各龄级的平均生长量，即分地位级绝对生长量标准（简称分级绝对生长量标准）。
Through the quantitative analysis of site factors, the site was divided into three grades. The DBH, tree height and volume of the candidate tree were fitted by RICHARDS growth curve. The average growth of each age class Grade absolute growth standards (referred to as grading absolute growth standards).