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从水源追踪氧和同位素信号到树环化合物

Haoyu Diao¹, Meisha Holloway-Phillips¹, Fabian Bernhard¹

¹Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland.

Plant, cell & environment

|May 9, 2025

概括

树环显示使用稳定同位素的水源. 纤维素中的氧-18比-2更好地跟踪水,而红素则更好地跟踪水.

科学领域:

同位素水文学同位素水文学
登德罗年代学登德罗年代学
森林生态水文学森林生态水文学

背景情况:

树环中的稳定同位素 (δ¹⁸O, δ²H) 提供了对环境水的洞察力.
长期同位素数据集对于理解这些关系至关重要,但很少.
在瑞士森林中研究了挪威杉 (Picea abies),以解决这一数据缺口.

研究的目的:

为了研究环境水和树环化合物之间的同位素关系.
评估树环纤维素和木质素对生态水文重建的适用性.
开发转移函数来估计森林水源和动态.

主要方法:

在土壤溶液中分析了17年的时间序列 (2006-2022年) δ18O和 δ2H,模拟了降水,木质水,树环纤维素和木质素.
在三个不同的瑞士森林地区利用每两周一次的测量.
相关的同位素数据以建立关系和开发预测转移函数.

主要成果:

树环纤维素 δ¹⁸O有效地保存水源信息,性能优于 δ²H.
树环素 δ2H 作为土壤水的有价值的替代代品,特别是当纤维素数据不那么有信息时.
发现了显著的线性同位素关系,使得将树环同位素与降水和树木水联系起来的转移函数的发展成为可能.

结论:

树环纤维素 δ¹⁸O 是生态水文重建的可靠代理.
素 δ 2 H 为追踪土壤水源提供了一个补充的代理.
开发的转移函数增强了树环同位素信号的解释,用于对森林水动态的回顾性分析.

关键词:

纤维素纤维素的使用方法同位素是的同位素之一.红素甲基组是红素的甲基组之一.交换氧气原子,交换氧气原子.降水降水降水降水降水季节性原产地指数季节性原产地指数土壤水土壤水土树木吸水率树木吸水率克西勒姆的水是水的

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