在2022年夏季干旱期间,在一个未经营的,混合的树林中,将树液流与树木水不足联系起来
L S Donfack1, M Mund2, F Koebsch3
1Department of Silviculture and Forest Ecology of the Temperate Zones, University of Göttingen, Göttingen, Germany.
Plant biology (Stuttgart, Germany)
|December 25, 2024
概括
温带森林面临着干旱. 树木缺水 (TWD) 和树液流密度 (SFD) 的反应因物种和环境条件而异. 在干旱压力下,TWD和SFD不是可互换的代理.
科学领域:
- 森林生态 森林生态
- 植物生理学 植物生理学
- 干旱压力研究研究
背景情况:
- 温带混合森林容易受到干旱的影响,有可能退化.
- 了解树木对干旱的生理反应对于森林管理至关重要.
- 在干旱条件下,树液流密度 (SFD) 和树木水不足 (TWD) 之间的相互作用需要进一步研究.
研究的目的:
- 调查欧洲树木物种中SFD和TWD对干旱的物种特异反应.
- 在干燥阶段分析SFD,TWD和环境因素 (土壤水分,VPD,PPFD) 之间的相互作用.
- 为了确定TWD是否可以作为SFD的代理,或者反之亦然,在干旱压力下.
主要方法:
- 监测SFD和TWD使用液液流和树枝仪测量.
- 收集高时间分辨率的环境数据 (土壤水分,VPD,PPFD).
- 分析了三个同时出现的欧洲树种的反应:Fagus sylvatica,Fraxinus excelsior和Acer pseudoplatanus.
主要成果:
- 对土壤干燥的SFD反应在不同物种中是相似的,但TWD在Fraxinus excelsior中更高.
- 无论是TWD还是SFD都对土壤水分含量 (SWC) 有反应,而SFD显示出更强的反应.
- TWD/SFD与环境因素之间的显著相关性在潮湿和干燥阶段之间以及根据物种而异.
结论:
- 特定物种的木材解剖学和用水策略并不一致地解释观察到的TWD和SFD反应.
- TWD和SFD之间的非线性相关性和歇斯底里表明,由时间滞后和对环境驱动因素的不同灵敏度影响的复杂相互作用.
- 在干旱压力下,TWD不应该被用作SFD的替代品,SFD也不应该被用作TWD的替代品.
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