【摘要】 根据 16 0株样木资料 ,以年龄 (X1)、胸径 (X2 )、树高 (X3 )、枝下高 (X4 )、冠幅 (X5)为说明变量 ,建立以立木干材材积 (Y)为基准变量的收获模型。更多还原

【Abstract】 According to the details of 160 sample trees of Alnus cremastogyne,five factors such as age(x 1),DBH(x 2),height(x 3),under branch height(x 4),and crown breadth(x 5)were measured and thought to be following variable,with the standing tree volume(Y)as basic variable,the gain model were established.更多还原