August 1, 2025Water Resources ResearchOpen Access

Opportunistic Short‐Term Water Uptake Dynamics by Subalpine Trees Observed via In Situ Water Isotope Measurements

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Water uptake shifted notably, with aspen trees sourcing ⅔ of their water from deeper soil layers during dry periods, demonstrating adaptation to drought.
Daily measurements revealed that tree water dynamics depend significantly on both snowmelt and precipitation patterns, affecting forest health during climate shifts.
In-situ stable isotopes were utilized to analyze water dynamics, examining interactions between soil moisture and tree transpiration in subalpine ecosystems.
Findings suggest that rainfall may primarily support transpiration instead of groundwater recharge, emphasizing the need for adaptive forest management practices.

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Observational analysis shows water uptake shifts in subalpine trees during drought, highlighting snowmelt's crucial role.

Sprenger et al. (2025) studied this question.

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