Summary
This review re-examines the ecohydrologic separation hypothesis, which posits that plants and streams access water from different sources despite sharing a common rooting zone. The authors argue that whilst isotopic differences between plant and stream water are commonly observed, their interpretation has been confounded by inadequate consideration of soil heterogeneity and multiple potential mechanisms. They advocate redirecting focus from simply documenting isotopic differences towards understanding how heterogeneous infiltration and root uptake processes generate those differences, and outline how plant and soil-water stable isotope data can better inform soil-water transport and plant-water recharge representation.
Regional applicability
The paper is a methodological and conceptual review with global relevance to hydrological science. Its framework for interpreting stable isotope data in plants and soils would be applicable to United Kingdom field studies investigating plant water sources and soil water dynamics, though the review does not focus on UK-specific conditions.
Key measures
Stable isotope compositions of plant water, stream water, and subsurface water pools; analysis of isotopic fractionation patterns
Outcomes reported
The paper reviews the ecohydrologic separation hypothesis and examines how isotopic differences in plant, stream, and subsurface water reflect heterogeneous infiltration and root uptake processes rather than simple translatory flow.
Topic tags
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