论文部分内容阅读
用正形数、胸高形数和经验回归方程3种方法编制的樟子松人工林二元材积表,其精度比较的结果表明,正形数法最优,其次是胸高形数法。直接用经验回归方程编制的一元材积表和利用树高曲线把胸高形数二元材积表导算成一元材积表的精度比较结果表明,后者优于前者.因此,利用胸高形数是编制材积表的有效方法。
The results of comparison of the precision of the binary volume table of Pinus sylvestris var. Mongolica prepared by three methods: positive number, thoracic shape number and empirical regression equation show that the positive number method is the best, followed by the chest height shape number method. The comparison of the accuracy of the one-dimensional volume table prepared by empirical regression equation with the one-dimensional volume table guided by the tree height curve to the one-dimensional volume table indicates that the latter is superior to the former. Therefore, the use of thoracic shape is an effective method of compiling volume charts.