森林资源动态预测方法的研究Ⅱ．编制可变密度收获表的收获预估模型

Studies on the Dynamic Prediction Methods of Forest Resources Ⅱ.The yield pre-evaluation models of compiling changeable density yield tables

本文在多型地位指数曲线基础上确定各地位指数级林木长到胸高位置的年龄，以Ｒｉｃｈａｒｄｓ生长方程扩展式为基础推导出密度指数、地位指数与断面积的数学模型，并由此提出系统、完整的编制人工林可变密度收获表的收获预估模型。以福建省杉木人工林为例，证明这些模型的拟合结果相关指数大，回归剩余残差小，对各种不同树种可变密度收获表的编制具有指导意义。

Besed on the multiple-form site index curves,this paper determined the age of forest trees withvarious site index grades growing to the breast-height position and derived the mathematic models of densityindex,site index and basal area on the basis of the Richards growth equation expansion formula from whichit put forward the systematic and complete yield pre-evaluation models for compiling changeable density plan-tation yield tables.