Identification of Source‐Water Oxygen Isotopes in Trees Toolkit (ISO‐Tool) for Deciphering Historical Water Use by Forest Trees
Identification of Source‐Water Oxygen Isotopes in Trees Toolkit (ISO‐Tool) for Deciphering Historical Water Use by Forest Trees
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DOI：
10.1029/2018wr024519
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发表时间：
2019-12
影响因子：
5.4
通讯作者：
C. Sargeant;M. Singer;C. Vallet-Coulomb
中科院分区：
文献类型：
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作者：
C. Sargeant;M. Singer;C. Vallet-Coulomb
由于水循环在整个地球仪的区域表现，水文状况在气候变化下受到干扰，导致地球表面附近水的空间和时间分布发生变化。水是植物生态系统的重要资源，而水文对植物健康的限制尤其复杂。为了预测地下水的可用性如何在未来发展，并影响植物水源使用的动态，以及各种生物群落中植被的健康和功能，我们需要一个强大的，定量的框架，将水的可用性与过去的植物用水联系起来，这是受历史数据的约束。在这里，我们概述了树木中源水氧同位素的识别工具包（ISO工具），旨在回顾性地调查树木吸水的动态。ISO-Tool利用树木年轮同位素（δ 18 O）结合生物力学分馏模型来追溯任何生长时期所使用的水的δ 18 O。通过与当地水源、气候和水文变量中的δ 18 O测量值进行比较，ISO‐Tool可以重建和提供过去生态水文相互作用的信息。我们概述了约束源水δ 18 O追溯所需的建模组件和数据要求。我们展示了ISO工具的实用性和有效性，三个河岸实地考察点的特点是气候，地貌和水文复杂性的差异。我们还指出，ISO‐Tool可以应用于一系列不同的同位素端元存在的植被环境。我们提出了一套工具组，它可以自适应地应用，确保科学进步，在了解回顾性生态水文学，即使在不同程度的数据可用性。
Hydrological regimes are being perturbed under climate change due to the regional expression of the water cycle across the globe, leading to alterations in the spatial and temporal distribution of water near the Earth's surface. Water is a critical resource for plant ecosystems, and hydrological limitations on vegetative health are particularly complex. To anticipate how subsurface water availability may evolve in the future and affect the dynamics of plant water source usage, as well as the health and functioning of vegetation in various biomes, we need a robust, quantitative framework for linking water availability to past plant water use, which is constrained by historical data. Here, we outline the Identification of Source‐water Oxygen isotopes in trees Toolkit (ISO‐Tool), designed to retrospectively investigate the dynamics of tree water uptake. ISO‐Tool utilizes tree‐ring isotopes (δ18O) combined with a biomechanistic fractionation model to retrodict the δ18O of water utilized during any period of growth. Through comparisons with measured δ18O in local water sources, climatic, and hydrological variables, ISO‐Tool can reconstruct and inform on past ecohydrological interactions. We provide an overview of the modeling components and data requirements necessary to constrain the retrodictions of source‐water δ18O. We demonstrate the utility and efficacy of ISO‐Tool for three riparian field sites characterized by differences in climatic, geomorphic, and hydrologic complexity. We also state that ISO‐Tool can be applied to a range of vegetated environments where distinct isotopic endmembers exist. We present a set of tool groups, which can be applied adaptively, ensuring that scientific progress in understanding retrospective ecohydrology can be made, even under varying degrees of data availability.