改进的四参数柱干比曲线式

A New Kind of Stem Profile—? ? JZ]Four parameter Cylinder volume Ratio Stem Profile

在综合干曲线式和相对干形的基础上 ,针对解决应用研究问题 ,文章首次提出四参数柱干比曲线式。用取自秦岭林区的油松与栎类样木、标准木资料进行拟合 ,带皮油松 R2≥ 0 .99的占了93% ,去皮为 78% ;而带皮、去皮栎类依次为 79.8%、73.3% ,说明四参数柱干比曲线式具有较好的拟合性。通过计算得 4个参数值 ,进一步作出了两树种的带皮。

On the basis of stem profile and relative stem form,the four parameter cylinder volume ratio stem profile was put forward.The results of fitting the data of Pinus tabulaeformis and Quercus aliena from Qinling Mountains showed that the P.tabulaeformis with bark and R 2≥0.99 amounted for 93%,that without bark amounted for 78%,while Q.aliena with bark and without bark amounted for 79.8% and 73.3%.This result proved that four parameter cylinder volume ratio stem profile has perfect fitness.By estimating the values of four parameters,the graphs of four parameter cylinder volume ratio stem profile were established.