尾叶桉人工林二元材积表的研制

通过收集福建省永安市不同林龄、立地、密度的尾叶桉人工林林分的样木资料,采用多模型优选法和逐步回归法研制尾叶桉人工林二元立木材积表,并用相关指数、剩余标准差、平均系统误差、平均相对误差绝对值、预估精度作为评价指标,应用灰色关联分析法建立综合评价指数,评价模型优劣。经检验,所编的材积表完全符合生产上的精度要求,且理论基础扎实,编表结果可靠,可在森林资源调查中推广应用。

The Study on Dual Volume Table of Eucalyptus urophylla Plantation

Through collecting the sample of different ages,sites,densities of Eucalyptus urophylla plantation in Yong'an,Fujian,Eucalyptus urophylla plantation dual volume table was made by multiple models optimum seeking method and the step-by-step regression analysis method.The relevant index,the remainder of the standard deviation,an average system error,the mean relative absolute error and forecast accuracy were used as the evaluation index.The comprehensive evaluation indexes were established to evaluate the mode...