海南椰子木维管束形态特征及其与物理力学性能的关系

陆全济; 蒋汇川; 李家宁; 李民; 李冠君

doi:10.12326/j.2096-9694.2023181

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海南椰子木维管束形态特征及其与物理力学性能的关系
Relationship Between Morphological Characteristics of Vascular Bundles and Physical and Mechanical Properties of Hainan Coconut Wood
中国热带农业科学院橡胶研究所
海南省热带作物栽培生理学重点实验室/省部共建国家重点实验室培育基地
海南省高性能天然橡胶加工重点实验室，海南海口 571101
2024年38卷第3期页码：21-32
纸质出版日期： 2024-05-30 ，
DOI： 10.12326/j.2096-9694.2023181
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陆全济,蒋汇川,李家宁等.海南椰子木维管束形态特征及其与物理力学性能的关系[J].木材科学与技术,2024,38(03):21-32.

LU Quanji,JIANG Huichuan,LI Jianing,et al.Relationship Between Morphological Characteristics of Vascular Bundles and Physical and Mechanical Properties of Hainan Coconut Wood[J].Chinese Journal of Wood Science and Technology,2024,38(03):21-32.
陆全济,蒋汇川,李家宁等.海南椰子木维管束形态特征及其与物理力学性能的关系[J].木材科学与技术,2024,38(03):21-32. DOI： 10.12326/j.2096-9694.2023181.

LU Quanji,JIANG Huichuan,LI Jianing,et al.Relationship Between Morphological Characteristics of Vascular Bundles and Physical and Mechanical Properties of Hainan Coconut Wood[J].Chinese Journal of Wood Science and Technology,2024,38(03):21-32. DOI： 10.12326/j.2096-9694.2023181.

摘要

维管束是椰子木组织构造的重要组成部分，作为承重单元，维管束的形态特征影响椰子木的宏观物理力学性能。以树龄40 a的海南高种椰子木（

Cocos nucifera

）为材料，以径向和高度方向为考察因素，分析维管束的分布密度、直径、横切面面积和总面积占比在株内的变异规律，并探究维管束总面积占比与密度、顺纹抗压强度等物理力学性能指标的相关性。结果表明：不同树株间，除了维管束总面积占比、抗弯强度有显著差异外，维管束其他形态特征和物理力学性能指标差异均不显著。在径向从内部向外部，椰子木维管束的分布密度、直径、横切面面积和总面积占比逐渐增大，与径向位置呈高度线性正相关；椰子木的密度和顺纹抗压强度等物理力学性能亦逐渐增大，与维管束总面积占比呈高度线性正相关。在高度方向从底部向上，维管束的直径和横切面面积逐渐减小，分布密度和总面积占比先增加后减少，与高度位置呈显著或高度相关。基于维管束总面积占比指标建立椰子木物理力学性能的模型，模型预测结果可为椰子

木下锯方法和锯材质量分等提供依据。

Abstract

The vascular bundle is an important component whose microscopic characteristics and distribution affect coconut wood’s physical and mechanical properties. In order to evaluate the variation of vascular bundles and their effect on the physical and mechanical properties at various tree positions

40-year-old coconut wood from Hainan province of China was tested. The distribution density

diameter

cross-section area

and total area percentage of vascular bundles were evaluated in height and radial directions

while the total area percentage of vascular bundle effect on density and mechanical properties were also investigated. The results showed that there are no significant differences in the morphological characteristics of vascular bundles and physical and mechanical performance among different trees

except in total area proportion of vascular bundles and MOR. In the radial direction

the distribution density

diameter

cross-section area

and total area percentage of vascular bundles gradually increase from the center to the periphery

showing a significant positive linear correlation along the radial position. The density and mechanical properties of coconut wood gradually increase from the center to the periphery

with a high positive linear correlation with the total area proportion of the vascular bundles. In the height direction (from bottom to top)

the diameter and cross-section area of the vascular bundles gradually decreased

and the distribution density and total area percentage of the vascular bundles first increased and then decreased

with an overall strong negative linear correlation. In general

the density and mechanical properties of coconut wood increase as the area percentage of vascular bundles increase. A model of the physical and mechanical properties of coconut wood is developed based on the proportion index of vascular bundle area. The predicted results from the model provide a basis for sawing and grading coconut wood.

关键词

椰子木维管束形态特征物理力学性能

Keywords

coconut woodvascular bundlemorphological characteristicsphysical and mechanical properties

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