几乎即时的茎直径对大气水需求波动的反应
Roberto L Salomón1, Jaime Puértolas2, José Carlos Miranda1
1Departamento de Sistemas y Recursos Naturales, FORESCENT Research Group, Universidad Politécnica de Madrid, Jose Antonio Novais 10, 28040 Madrid, Spain.
Tree physiology
|September 17, 2024
概括
树茎水池几乎立即对大气蒸发需求的变化做出反应. 这种快速的反应,由树木木的水使用驱动,挑战了关于树木水运动动态的先前假设.
科学领域:
- 植物生理学 植物生理学
- 森林生态 森林生态
- 水文学的水文学
背景情况:
- 溪流水池缓冲着体水的潜力,抵御诸如蒸汽压力缺陷 (VPD) 等环境变化.
- 干水储备对环境线索的反应速度尚未得到充分理解.
研究的目的:
- 为了研究干水池对高频环境振荡的反应的时间动态.
- 为了确定茎的辐射变化 (ΔR) 的速度,跟踪树苗的环境线索.
主要方法:
- 在控制的温室条件下,每30秒间隔监测9个树苗的茎辐射变化 (ΔR).
- 测量了树干上部和下部位置的ΔR,区分了树皮和树皮.
- 与 VPD 和温度等环境变量相关的 ΔR 动态,通过重力测量测量验证.
主要成果:
- 干径变化 (ΔR) 几乎瞬间 (<1分钟) 响应VPD变化.
- 茎 ΔR 响应在茎上部和下部位置之间没有显著的时间差异.
- 温度变化落后于茎 ΔR,而透气与 ΔR 动态同步.
结论:
- 树干储存的水对大气蒸发需求的反应要比以前假设的要快得多.
- 透气中使用的水源对观察到的时间滞后有重大影响.
- 树的快速反应可能是由于其高组织弹性和直接利用体水,绕过辐射流障碍.
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