刺槐林分材种出材量模型

Models of Outturn of the Felling of Wood Assortments for Robinia pseudoacacia Stand

刺槐林分经济材、大径坑木、废材随林分平均年龄变化呈幂函数相关，随林分平均直径、林分平均高变化呈直线相关。柱材与小径坑木随林分平均年龄、林分平均直径与林分平均高的变化呈Ｊ型，小规格原木变化呈反Ｊ型，幂函数预测模型适用于废材预测，直线型预测模型适用于经济材、大径坑木预测。各模型的相关系数均在０．９９以上，相对系统误差小于±２．６１％，相对均方差小于１０．２２％。林分材种出材率表可以应用于生产实践，也可用于计算林分工艺成熟龄。

It was found that the commercial wood, big diameter pit log and slash of Robinia pseudoacacia Linn stand correlated with the average age (A) of the stand in power function, and correlated with the average diameter D and height H of the stand linearly. The column wood and small pit log correlated with D , H ,and A in J shape. The small size log however, correlated in inverse J shape. The power function model is suitable to slash, the linear one is suitable to commercial wood and big diameter pit log. The correlation coefficients of each model were above 0.99, relative systematic errors below 2.61%, relative mean square deviations below 10.22%. The outturn table of each wood assortment can be applied in practice, and also in calculating the technical cutting age of the stand.