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以林龄、地位指数、林分密度指数为自变量因子，由扩展的Ｒｉｃｈａｒｄｓ 生长函数结合林分直径分布规律，建立直径的生长模型，运用改进单纯形法最优拟合该生长模型，以此作为基础推算其它因子，编制出福建省马尾松人工林可变密度收获表，为福建省马尾松人工林的经营管理提供了理论依据
Taking the stand age, status index and stand density index as independent variable factors, the extended Richards growth function was combined with the distribution of stand diameter to establish the growth model of diameter. The improved simplex method was used to fit the growth model optimally Based on other factors, variable density harvest table of Pinus massoniana plantation in Fujian Province was compiled, which provided a theoretical basis for the management of Masson pine plantation in Fujian Province