What Ecohydrologic Separation Is and Where We Can Go With It
What Ecohydrologic Separation Is and Where We Can Go With It
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DOI：
10.1029/2020wr027238
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发表时间：
2020-07
影响因子：
5.4
通讯作者：
M. Sprenger;S. Allen
中科院分区：
文献类型：
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作者：
M. Sprenger;S. Allen
“生态水文分离”假说挑战了通过生根区的径流假设。然而，旨在测试生态水文分离的研究在很大程度上这样做的渗透和根区补给过程的讨论不足，而不是主要集中在溪流水和植物水之间的同位素差异或分馏同位素比在植物水的存在。基于广泛观察到的土壤和流域的异质性，我们认为，在大多数情况下，预计在植物，溪流和其他地下水池的水的同位素组成的差异。这些植物和溪流水同位素差异的解释是很重要的，但诊断任何特定过程的作用通常会被导致这些同位素差异的潜在机制的多样性所混淆。因此，我们应该从简单地描述它们的发生和重新集中讨论生态水文分离的异质渗透和根系吸收过程如何导致这种差异。因此，我们概述了植物和土壤-水稳定同位素数据可能有助于促进我们对土壤-水运输和植物-水补给的理解和表示的领域。
The “ecohydrologic separation” hypothesis challenged assumptions of translatory flow through the rooting zone. However, studies aiming to test ecohydrologic separation have largely done so with insufficient discussion of infiltration and rooting zone recharge processes and instead have mostly focused on either isotopic differences between stream water and plant water or the presence of fractionated isotope ratios in plant water. Based on extensively observed heterogeneities in soils and watersheds, we posit that differences in isotopic compositions of water in plants, streams, and other subsurface pools are expected in most scenarios. Interpretation of those plant‐and‐stream water isotopic differences is important, but diagnosing the role of any specific process is typically confounded by the diversity of potential mechanisms contributing to those isotopic differences. Thus, we should progress from simply describing their occurrences and refocus the discussion of ecohydrologic separation on how heterogeneous infiltration and root uptake processes lead to such differences. Consequently, we outline areas where plant and soil‐water stable isotope data may be useful for advancing our understanding and representation of soil‐water transport and plant‐water recharge.