在五种温带树种中,协调的液压特征影响到水力故障的两个时间阶段,这些树种在口腔强度上有所不同
Pierre-André Waite1,2,3, Manish Kumar1,4, Roman M Link1,2
1Julius-von-Sachs-Institute of Biological Sciences, Ecophysiology and Vegetation Ecology, University of Würzburg, Julius-von-Sachs-Platz 3, 97082 Würzburg, Germany.
Tree physiology
|April 12, 2024
概括
树木对干旱的反应包括两个阶段:口腔关闭和液压故障. 隔离水的策略影响了水的使用和第一阶段,而树脂安全性决定了干旱生存时间.
科学领域:
- 植物生理学 植物生理学
- 森林生态 森林生态
- 干旱应激反应 干旱应激反应
背景情况:
- 在全球范围内,森林面临着干旱引起的死亡率上升.
- 树木干旱的反应是复杂的,具有特定物种的战略.
- 干旱应对包括两个阶段:口腔关闭和液压故障.
研究的目的:
- 调查温带树木中特定物种的干旱反应.
- 影响口腔关闭的特征与液压故障的特征.
- 评估同水性在干旱生存中的作用.
主要方法:
- 在五种宽叶温带树种上进行了干燥试验.
- 测量的特征:水电位 (Ptlp,Pgs90,P12,P50,P88),液压电容 (C),最小叶子导电 (gmin),水景面积 (HSA),液压安全边缘 (HSM).
- 估计到口腔关闭 (tsc) 和临界液压故障 (tcrit) 的时间.
主要成果:
- 同水性与叶子安全性 (Ptlp,gmin),避免干旱 (C) 和到口腔关闭的时间 (tsc) 相相关.
- 异水性被脱离了氧化物安全性 (HSM,P88) 和至关键液压故障 (tcrit) 的时间.
- 具有更宽的液压安全边缘 (HSM) 和较低的P88的物种在以后达到关键液压故障,不管口腔调节如何.
结论:
- 口腔调节决定了关闭前阶段的持续时间.
- 树的安全性是干旱生存时间 (关闭后阶段) 的首要驱动因素.
- 同水性与用水策略有关,而不仅仅是干旱生存;HSA补充HSM进行全面的干旱应对评估.
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