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把直径密度效应模型和同龄纯林自然稀疏方程结合在一起，预估不同年龄阶段的平均直径和单位面积上立木株数。在此基础上，选择Weibull分布函数，用参数回收技术建立杉木人工林直径分布收获预估模型。该模型不仅能输出林分在各个年龄阶段的总体收获量（蓄积量和出材量），而且能输出各径阶的收获量，为经营决策者提供了详细的信息，也为编制包括材种出材量在内的收获表提供了新途径。
The diameter-density effect model is combined with the natural sparse equation of pure forest of the same age to estimate the average diameter and stand number per unit area in different age stages. Based on this, the Weibull distribution function was selected and the prediction model of diameter distribution of Chinese fir plantation was established by parameter recovery technology. The model can not only output the total harvest (volume and yield) of forest stands at all stages of life, but also output the yield of each stage, provide detailed information for business decision-makers, The harvest table provides a new way of harvesting.