红树根吸水深度受到邻近树木物种组成的影响
Matthew Sobota1, Kevin Li1, James Knighton1
1Department of Natural Resources and the Environment, University of Connecticut, Storrs, CT, USA.
Tree physiology
|April 23, 2025
概括
混合物种森林组成影响红树根吸水 (RWU). 树灰和杉树使用的水比树和树使用的水更深,更古老,影响干旱风险.
科学领域:
- 森林生态 森林生态
- 水文学的水文学
- 植物生理学 植物生理学
背景情况:
- 了解混合物种森林中的地下水吸收对于预测森林用水和压力至关重要.
- 根水吸收 (RWU) 在树木之间有所不同,但其对物种身份和邻居的依赖性尚未完全理解.
研究的目的:
- 研究邻近树种如何影响红 (Acer rubrum) 根的吸水深度和使用的水的年龄.
- 评估红在有着不同的邻近物种组成的地块上的RWU和水年龄之间的差异.
主要方法:
- 实地测量了土壤水分和稳定同位素 (δ2H, δ18O) 在体水和土壤中的含量.
- 基于过程的标准级生态水文模型的校准,以估计物种级RWU深度.
- 在不同的邻近物种背景下,红树之间的RWU,透气率和水年龄的比较.
主要成果:
- 在两个地块之间观察到红RWU深度,透气率和吸水年龄的显著差异.
- 与树和白树相邻的树相比,与树和树相邻的树相比,它们获得了更深,更古老的水.
- 干旱风险各不相同,浅水用户显示每周降水-透气相关性,深水用户显示每月相关性.
结论:
- 邻近树木物种的组成显著改变了红的吸水策略和干旱脆弱性.
- 研究结果强调了在森林水竞争中考虑物种相互作用的重要性.
- 结果为水文和地球系统模型中森林植根策略的表现提供了信息.
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