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利用Richards方程，建立以林分年龄、地位指数、林分密度指数为输入变量，林分总断面积、平均胸径为输出变量的生长模型，误差分析表明该模型适用．在此基础上，编制了杉木人工林可变密度收获表．
The Richards equation was used to establish the growth model of the output variable with the stand age, status index and stand density index as input variables, the total area of stand and the average diameter at breast height as output variables, and the error analysis shows that the model is suitable. On this basis, the variable density harvest table of Chinese fir plantation was compiled.