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望高比(B)是胸高形率(q_2)和树干形状指数(r)的函数,是一个比望高更为稳定的干形指标。绝大多数乔木树种的望高比在0.64—0.74之间。由望高比导出的普雷斯勒材积式为V=2B/3g(H+1)=f_pg(H+1),而绝大多数乔木树种的普雷斯勒形数f_p)在0.43—0.49之间。经70株马尾松解析木验证,其材积平均误差仅+0.1％。普雷斯勒形数与树种之间的关系,有待进一步探讨。
The height-to-height ratio (B) is a function of the thorax-height ratio (q_2) and the trunk shape index (r) and is a more stable indicator of dryness than the height of the height. The vast majority of arborous tree hike ratio between 0.64-0.74. The prestler calculus formula derived from the aspect ratio is V = 2B / 3g (H + 1) = f_pg (H + 1), whereas the Precell number f_p of most tree species is between 0.43 and 0.49 between. After 70 masson pine wood analysis, the average volume error of only +0.1%. The relationship between Presform form and tree species needs to be further explored.