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首页> 外文期刊>IAWA Journal >Dense but flexible wood - How leaf nodes impact xylem mechanics in Juglans cahfornica
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Dense but flexible wood - How leaf nodes impact xylem mechanics in Juglans cahfornica

机译：致密但柔韧的木材 - 如何叶节点如何影响juglans cahfornica的木门力学

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摘要

Anode is the point of attachment of the leaf to the stein of a plant; gaps associated with nodes have been viewed as discontinuities of the stem vascular system. We tested the hypothesis that the node/gap is a spring-like joint that impacts stem flexibility even well after the leaves have been shed, with some stems specialized for elongation and others for flexibility. Four-point bending tests were done using an Instron Mechanical Testing Device with the independent variable being the number of nodes in the stem segment and dependent variables being Modulus of Elasticity (MOE), Modulus of Rupture (MOR), and xylem density. Node anatomy was examined microscopically to assess structure and function. The stiffness of the stein was inversely proportional to the frequency of leaf nodes. Surprisingly, xylem density was inversely proportional to the frequency of leaf nodes in stems of adult trees. The tissue around nodes/gaps consisted of twisted and contorted cells that may be effective at absorbing compressive and tensile stresses. Because nodes behave as spring-like joints, the frequency of nodes relates to function, with some sterns specialized for vertical expansion and others for light capture and damping of wind stress. The ultimate stems on a tree are the most bendable, which may allow the trees to avoid breakage.
机译：阳极是叶子对植物斯坦的附着点;与节点相关的间隙已被视为茎血管系统的不连续性。我们测试了节点/间隙的假设是弹簧状关节，在叶子脱落后均匀影响茎的灵活性，一些专门用于伸长率和其他茎的茎。使用具有独立变量的Instron机械测试装置进行四点弯曲试验，该变量是茎段中的节点数量和依赖变量是弹性模量（MOE），破裂模量（MOR）和木质密度。在显微镜上检查节点解剖学以评估结构和功能。 Stein的刚度与叶节点的频率成反比。令人惊讶的是，木质密度与成年树茎中的叶节点的频率成反比。节点/间隙周围的组织由扭曲和扭曲的细胞组成，其可以有效地吸收压缩和拉伸应力。因为节点表现为春季相同的关节，所以节点的频率涉及功能，其中一些船尾专门用于垂直扩展和其他用于光捕获和阻尼风应力的船尾。树上的终极茎是最可弯曲的，这可能允许树木避免破损。

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