Establishment of a volume prediction model for nodes based on scar size
[Objective]This study took 49 artificial Pinus koraiensis with a total of 1 207 knot data from 29 standard plots in the Linkou Forestry Bureau and the Dongjingcheng Forestry Bureau in Heilongjiang province as the research object,and a knot volume prediction model was constructed based on their relevant data.Through analyzing the distribution law of the internal knot volume of the artificial Korean pine trunks,it achieved non-destructive evaluation of wood quality and provided a reference for the scientific and rational utilization of wood.[Method]Firstly,we collected relevant data through analysis and reviewed relevant literature to establish a basic model.When constructing a mixed model,introduced random effects at the sample tree and sample plot levels,and selected the best fitting mixed model by comparing evaluation metrics such as AIC and BIC;When constructing a two-level nested mixed model,sample trees were nested at the sample plot level,and the optimal two-level nested mixed model was obtained based on the fitting evaluation index.[Result]Among the three models,the fitting accuracy of the single-level mixed model and the two-level nested mixed model was higher than that of the basic model.The AIC,BIC,and other evaluation indicators showed that the two-level nested mixed model had a better fitting effect on the attributes of knots than the single-level mixed effect model.The test results showed that the prediction accuracy of the basic model was greater than 90%,and the prediction accuracy of both hybrid models was above 98%,indicating that the constructed model could provide good predictions for nodule volume.[Conclusion]Based on the two-level nested mixed model,not only can non-destructive estimation of knot volume be achieved,but also the distribution law of knot volume inside the artificial P.koraiensis trunk can be more accurately reflected.Realize non-destructive evaluation of wood quality,provide reference for scientific and rational utilization of wood,and thus improve economic benefits.
artificial Pinus koraiensis forestknot volumescar sizemixed model
NETL
NSTL
万方数据
