Ludovic Martin, Nicole Brunel-Michac, Pierre Conchon, Hervé Cochard, Eric Badel
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引用次数: 0
Key message
Hydraulic properties of wetwood differ from normal sapwood: hydraulic conductivity is null and water contained in wetwood is totally trapped. Wetwood could result from a bad healing of dead branches.
Abstract
Wetwood is a common phenomenon in silver fir (Abies alba Mill.), posing technical challenges for its industrial use. In this study, we thoroughly characterized the properties of this particular wood, investigating the mechanisms governing its formation and exploring its potential physiological relevance for trees. To address these objectives, we used a wide range of techniques, offering a comprehensive insight into the structure of wetwood at different scales, from cellular to whole-tree. Our results revealed significant variability in moisture distribution in the heartwood of the silver fir trees studied, suggesting the absence of a predefined distribution pattern. The physical properties of wetwood differ from those of sapwood, notably in terms of its hydraulic conductivity, which is null. In addition, our study demonstrated that the anatomical characteristics of wetwood are identical to those of normal dry heartwood, including features such as aspirated tori in bordered pits and the absence of nuclei. These results suggest a normal initial duraminization process followed by a progressive resaturation of the heartwood of silver fir. Taken together, these observations strongly suggest that the water present in wetwood is trapped and unavailable for use by the tree, particularly under conditions of prolonged drought.
关键信息湿材的水力特性与正常边材不同：水力传导性为零，湿材中的水分完全被截留。摘要湿材是银冷杉（Abies alba Mill.）中的一种常见现象，为其工业应用带来了技术挑战。在这项研究中，我们深入分析了这种特殊木材的特性，研究了其形成机制，并探讨了其对树木的潜在生理意义。为了实现这些目标，我们使用了多种技术，从细胞到整棵树等不同尺度对湿材的结构进行了全面深入的研究。我们的研究结果表明，所研究的银冷杉树木心材中的水分分布存在很大差异，这表明没有预先确定的分布模式。湿材的物理特性与边材不同，特别是在导水性方面，湿材的导水性是空的。此外，我们的研究还表明，湿材的解剖学特征与正常干燥心材的解剖学特征完全相同，包括在有边界的凹坑中出现吸气环和无核等特征。这些结果表明，银冷杉心材在正常的初始杜胺化过程之后会逐渐再饱和。综上所述，这些观察结果强烈表明，湿材中的水分被截留，无法被树木利用，尤其是在长期干旱的条件下。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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