在贵州省柳杉分布范围内设置典型样地,按8个径阶调查,共331株样木数据,其中建模样木240株,检验样木91株。选择《二元立木材积表编制技术规程》和与立木材积相关的4个数表模型进行模拟,采用ForStat统计软件中的加权最小二乘法,对不同模型中的离差平方和、相关指数、总相对误差等9项指标的拟合效果进行对比分析评价,选出柳杉二元立材积最佳模型,主要体现在分段检验各径阶总相对误差均达到小于±3%的要求。

Typical sample plots were set up in the distribution range of cryptomeria fortunei in Guizhou province,and 331 samples wood data were investigated according to 8 diameter steps,among which 240 were constructed and 91 were tested.Select "technical regulations for compiling binary stand timber volume table" and four number-table models related to stand volume,to simulate the model and taking the weighted least square method of ForStat statistical software,the different models of relative error from the sum of squared residuals,relevant index,total 9 indexes such as the fitting effect of comparative analysis and evaluation,elected binary standing timber volume optimal model of cryptomeria fortunei,mainly reflected in the segmented inspection the size order total relative error are less than ±3%.