Measuring wood density of different tree species using the micro-drilling resistance method

IF 2.4 3区 农林科学 Q1 FORESTRY
Jianfeng Yao, Hengyuan Liu, Jun Lu
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Abstract

In order to reduce modeling workload and improve the accuracy of wood density measurement, a modeling method for establishing an overall model for multiple tree species was studied. Firstly, the wood cores and drill resistance of 9 tree species were collected. The absolute dry density, wood moisture content, and average drill resistance for each wood core were calculated. Secondly, the random forest algorithm was used to rank the relative importance of each factor affecting wood density, and factors with relative importance higher than 0.05 were selected as independent variables for building the overall mathematical model for total tree species and sub model for individual tree species. The results showed that: (1) the relative importance of tree species and drill resistance on wood density was higher than 0.05; (2) the relative importance of moisture content and drill usage frequency (less than 150 times) on wood density was lower than 0.05; (3) the average estimation accuracy of overall model was 91.42%, while that of the sub model was only 90.44%; (4) among the 9 tree species, the standard deviation of the overall model for 5 tree species was lower than that of the sub model. The results showed that the accuracy and stability of the overall model were superior to those of the sub models, and it is feasible to establish an overall model to estimate wood density.

用微钻阻力法测定不同树种木材密度
为了减少建模工作量,提高木材密度测量的精度,研究了一种建立多树种整体模型的建模方法。首先采集了9种树种的木芯和抗钻性。计算了每个木芯的绝对干密度、木材含水率和平均钻阻。其次,采用随机森林算法对影响木材密度的各因子的相对重要度进行排序,选取相对重要度大于0.05的因子作为自变量,分别建立总树种的整体数学模型和单个树种的子模型;结果表明:(1)树种和钻阻对木材密度的相对重要性均大于0.05;(2)含水率和钻头使用频率(小于150次)对木材密度的相对重要性均小于0.05;(3)整体模型的平均估计精度为91.42%,而子模型的平均估计精度仅为90.44%;(4)在9种树种中,5种树种整体模型的标准差低于子模型的标准差。结果表明,整体模型的精度和稳定性优于子模型,建立整体模型估算木材密度是可行的。
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来源期刊
European Journal of Wood and Wood Products
European Journal of Wood and Wood Products 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
3.80%
发文量
124
审稿时长
6.0 months
期刊介绍: European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.
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