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测算森林蓄积量的关键之一是控制干形,蓄积量的精度很大程度上取决于所用干形值的精度。本文拟就干形控制方法提几点意见。一、关于回归分析方法本方法是将实测的d_(1.3)、h与f_(1.3),用最小二乘法配合回归方程,据之估算立木材积或胸高形数。常用的方程类型有:f_(1.3)=a·d_(1.3)~b·h~c(1)和f_(1.3)=a_0+a_1/d_(1.3)+a_2/h+a_3/d_(1.3)~2h(2)等。这种方法的优点是:利用数据的信息较充
One of the keys to measuring forest volume is controlling dryness. The accuracy of the stock volume depends to a great extent on the accuracy of the dryness values used. This article intends to dry control method to mention a few comments. First, on the regression analysis method The method is the measured d_ (1.3), h and f_ (1.3), with the least squares regression equation, according to estimates of standing timber or chest high number. Commonly used equation types are: f_ (1.3) = a · d_ (1.3) ~ b · h ~ c (1) and f_ (1.3) = a_0 + a_1 / d_ (1.3) + a_2 / h + a_3 / d_ ) ~ 2h (2) and so on. The advantage of this method is: the use of data more information