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一、材积方程的建立二元材积方程的误差是由干形决定,而干形又与树高的关系最为密切,因此林昌庚同志提出了实验形数,使材积方程中的形数固定。在新建的二元材积方程中,取实验形数树高修正值(H+3)。又经过试验发现,树高2米处的直径与胸高直径有d_(2.0)=a+bd_(1.3)关系,而参数a≈—1,b≈1。因为d_(2.0)=b(a/b+d_(1.3)),所以d_(2.0)=(d_(1.3)—1)。当取(d_(1.3)—1)为公式中的直径时,则可视为树高2米处的直径。于是获得新二元材积方程: V=(π/4)10~(-4)[(D-1)~2(H+3)]~b式中直径的单位为厘米,树高单位为米。
First, the establishment of volume equation Binary volume equation error is determined by the dry, dry and tree height and the closest relationship, so Comrade Lin Changgeng experimental number, the volume equation in the fixed number. In the new binary volume equation, take the experimental tree height correction (H + 3). It has been found through experiments that the diameter at the height of 2 meters and the diameter of the thoracic cavity have a relationship of d 2.0 2.0 = a + bd 1.3, and the parameters a≈-1 and b≈1. D_ (2.0) = (d_ (1.3) -1) because d_ (2.0) = b (a / b + d_ (1.3)). When (d_ (1.3) -1) is taken as the diameter in the formula, it can be regarded as the diameter at a height of 2 meters. So obtain the new binary volume equation: V = (π / 4) 10 ~ (-4) [(D-1) ~ 2 (H + 3)] ~ b where the diameter of the unit is cm, .