树皮受伤引发了逐渐的栓塞,在两种扩散多孔树种中蔓延
1Department of Experimental Biology, Faculty of Science, Masaryk University, Kamenice 5, Brno CZ-62500, Czech Republic.
Tree physiology
|November 6, 2023
概括
树上的树皮伤害会导致逐渐的栓塞,但对几天的水运输和叶子气体交换的影响有限. 这项研究研究了两种树木的树叶运输及其对树皮去除的反应.
科学领域:
- 植物生理学 植物生理学
- 森林生态 森林生态
- 植物水关系 植物水关系
背景情况:
- 树脂运输对于植物的生存和生长至关重要.
- 树皮受伤可能会破坏树皮细胞的功能,可能导致栓塞和运输失败.
- 皮皮伤害在树皮运输上的确切后果仍然不完全理解.
研究的目的:
- 为了研究树皮伤害对栓塞形成,叶子水潜力和树木气体交换的影响.
- 评估剥皮在增加的蒸发需求下对树皮运输的短期 (6小时) 和长期 (6天) 影响.
- 为了比较两个扩散多孔树种的这些效应: Acer platanoides L. 和 Prunus avium L.
主要方法:
- 在田间种植的Acer platanoides和Prunus avium的成熟树木被剥皮 (30%的周长).
- 栓塞形成,树叶液压导电性,叶子水潜力和气体交换在受伤后6小时和6天被测量.
- 用完整树皮的对照树枝进行比较.
主要成果:
- 脱皮导致有限的栓塞,主要是在伤口附近的最后一个年轮.
- 在6天的时间里,伤口下非导电性树脂膜区域显著增加 (22-29%至51-52%).
- 观察到液压导电性损失的小而无意义的增加 (6%至8-10%),叶子水潜力和气体交换不受影响.
结论:
- 树皮受伤会导致逐渐的,有限的栓塞在树中扩散.
- 树皮受伤的影响不会显著影响到远端器官的水输送或几天内叶子气体交换.
- 血管植物在水运输方面表现出对短期树皮损伤的一些弹性.
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