Adaptive growth of gymnosperm branches-ultrastructural and micromechanical examinations
Adaptive growth of gymnosperm branches-ultrastructural and micromechanical examinations
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DOI：
10.1007/s00344-004-0042-2
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发表时间：
2004-06-01
影响因子：
4.8
通讯作者：
Jungnikl, K
中科院分区：
文献类型：
--
作者：
Burgert, I;Jungnikl, K
云杉（Picea abies [L.]）两种裸子植物的基部分枝的顶部、侧面和下面。[喀斯特]和红豆杉（Taxus baccata L.）在结构和力学特性上可能的适应性进行了研究。微拉伸试验在薄湿箔上进行，从分支的外围去除。研究了枝材的结构参数，如密度和s2层中的微纤维角度，以研究枝材的结构-功能关系。两根树枝的顶部、侧面和底部在结构和力学性能上存在显著差异。然而，没有观察到年龄和体型发育的显著变化。讨论了树木的适应性生长策略，包括水平生长树枝的生物力学约束。
The top, the lateral and the underside of basal branch segments of two gymnosperm species, spruce (Picea abies [L.] Karst.) and yew (Taxus baccata L.), were studied with respect to possible adaptation in structural and mechanical properties. Microtensile tests were performed on thin wet foils, which were removed from the periphery of the branches. Structural parameters such as density and the microfibril angle in the S2-layer were examined to investigate the structure-function relationships of the branch wood. The top, the lateral and the underside of both branches showed significant differences in their structural and mechanical properties. However, no significant variations were observed as a function of age and size development. The findings were discussed in view of adaptive growth strategies of trees, including biomechanical constraints of a horizontally growing branch.