Mechanical analysis of the strains generated by water tension in plant stems. Part II: strains in wood and bark and apparent compliance
Mechanical analysis of the strains generated by water tension in plant stems. Part II: strains in wood and bark and apparent compliance
复制标题
DOI：
10.1093/treephys/28.10.1513
复制
发表时间：
2008-10-01
期刊：
影响因子：
4
通讯作者：
Almeras, Tancrede
中科院分区：
文献类型：
--
作者：
Almeras, Tancrede
树干的直径在白天缩小，在夜间膨胀，以响应木质部中水分张力的变化。斯坦因收缩可以很容易地以非破坏性的方式测量，以获得有关树木水分状况的连续信息。应变和水张力变化之间的关系可以通过经验校准来评估，或者可以与植物的结构相关。进行了力学分析，使这种关系明确。茎被建模为由多层组织制成的圆柱体，包括心材、边材和内外树皮。水张力变化对组织表面表观应变的影响被量化为定义股骨柄解剖结构和组织机械性能的参数的函数。各种可能的应用在树生理学的上下文中提出了建议。
Tree steins shrink in diameter during the day and swell during the night in response to changes in water tension in the xylem. Stein shrinkage can easily be measured in a nondestructive way, to derive continuous information about tree water status. The relationship between the strain and the change in water tension can be evaluated by empirical calibrations, or can be related to the structure of the plant. A mechanical analysis was performed to make this relationship explicit. The stem is modeled as a cylinder made of multiple layers of tissues, including heartwood, sapwood, and inner and outer bark. The effect of changes in water tension on the apparent strain at the surface of a tissue is quantified as a function of parameters defining stem anatomy and the mechanical properties of the tissues. Various possible applications in the context of tree physiology are suggested.