建立临界区水取样、提取和同位素分析的通用方法框架,以研究植被用水情况

WIREs Water Pub Date : 2024-03-06 DOI:10.1002/wat2.1727
Natalie Ceperley, Teresa E. Gimeno, Suzanne R. Jacobs, Matthias Beyer, Maren Dubbert, Benjamin Fischer, Josie Geris, Ladislav Holko, Angelika Kübert, Samuel Le Gall, Marco M. Lehmann, Pilar Llorens, Cody Millar, Daniele Penna, Iván Prieto, Jesse Radolinski, Francesca Scandellari, Michael Stockinger, Christine Stumpp, Dörthe Tetzlaff, Ilja van Meerveld, Christiane Werner, Oktay Yildiz, Giulia Zuecco, Adrià Barbeta, Natalie Orlowski, Youri Rothfuss
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引用次数: 0

摘要

分析土壤和植物水样中氢和氧的稳定同位素组成有助于确定植被吸水的来源。这种方法要求在实验设计、样本采集、水提取和分析过程中仔细考虑植物和土壤基质的异质性。专业文献已经讨论了不同的水提取和同位素组成分析方法的可比性和缺点。然而,尽管对世界各地实验室的提取方法和基准方法进行了深入比较,但业界仍缺乏指导样本采集、提取和同位素分析的路线图,潜在用户的许多实际问题仍未得到解决:例如,提取的水代表哪个(土壤或植物)水池?这些都是新用户实施该方法的障碍。在此,我们总结了在 COST 行动 WATSON("临界区的水同位素:从地下水补给到植物蒸腾作用"-CA19120)框架内开展的讨论。我们提供了以下方面的指导原则:(1) 对土壤和植物材料进行取样以进行同位素分析;(2) 实验室或原位水提取方法;(3) 测量同位素组成。我们强调了从实验设计到同位素分析整个过程链的重要性,以最大限度地减少对不同水源对植物水分吸收的相对贡献的偏差估计。最后,我们承认了这种方法的一些局限性,并就在采集同位素分析样本之前收集关键环境参数提出了建议:水科学 > 水文过程 水科学 > 水与环境变化 水科学 > 水极端事件
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Toward a common methodological framework for the sampling, extraction, and isotopic analysis of water in the Critical Zone to study vegetation water use
The analysis of the stable isotopic composition of hydrogen and oxygen in water samples from soils and plants can help to identify sources of vegetation water uptake. This approach requires that the heterogeneous nature of plant and soil matrices is carefully accounted for during experimental design, sample collection, water extraction and analyses. The comparability and shortcomings of the different methods for extracting water and analyzing isotopic composition have been discussed in specialized literature. Yet, despite insightful comparisons of extraction methods and benchmarking methodologies of laboratories worldwide, the community still lacks a roadmap to guide sample collection, extraction, and isotopic analyses, and many practical issues for potential users remain unresolved: for example, which (soil or plant) water pool(s) does the extracted water represent? These constitute a hurdle for the implementation of the approach by newcomers. Here, we summarize discussions led in the framework of the COST Action WATSON (“WATer isotopeS in the critical zONe: from groundwater recharge to plant transpiration”—CA19120). We provide guidelines for (1) sampling soil and plant material for isotopic analysis, (2) methods for laboratory or in situ water extraction, and (3) measurements of isotopic composition. We highlight the importance of considering the process chain as a whole, from experimental design to isotopic analysis to minimize biased estimates of the relative contribution of different water sources to plant water uptake. We conclude by acknowledging some of the limitations of this methodology and advice on the collection of key environmental parameters prior to sample collection for isotopic analyses.This article is categorized under: Science of Water > Hydrological Processes Science of Water > Water and Environmental Change Science of Water > Water Extremes
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