What does this research mean for the field?

River water, groundwater, and direct precipitation contribute 37.5%, 33.9%, and 28.6%, respectively, to the recharge of Qinghai Lake, with local moisture recycling and strong river-groundwater connectivity driving the basin's hydrological processes. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To identify hydrological recharge relationships and quantify source contributions across precipitation, river water, groundwater, and lake water in the Qinghai Lake Basin.

September 2, 2026HydrologyOpen Access

Stable Isotope Tracing of Water Sources and Recharge Contributions to Qinghai Lake, Northeastern Qinghai–Tibet Plateau

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Authors

YCYu ChenQinghai University XLXingyue LiQinghai University ZYZiwei YangQinghai University

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Implication

Isotopic tracing uncovers recharge dynamics and hydrological pathways across water bodies, highlighting substantial groundwater and river inflow contributions.

Key Points

To identify hydrological recharge relationships and quantify source contributions across precipitation, river water, groundwater, and lake water in the Qinghai Lake Basin.
Collected precipitation, river water, groundwater, and lake water samples across the basin from April to November 2024.
Measured hydrogen and oxygen stable isotopes (δ2H and δ18O) to determine spatiotemporal variations and establish local water lines.
Applied the Bayesian isotope mixing model (MixSIAR) to quantify the proportion of recharge contributions feeding into the lake.
The basin's Local Meteoric Water Line was established as δ2H = 8.07δ18O + 37.48 (R2 = 0.96), displaying higher slope and intercept values than the global baseline due to recycled evaporated moisture.
Lake water was the most isotopically enriched water body due to strong evaporative fractionation, whereas groundwater maintained the most depleted and stable isotopic signals.
MixSIAR modeling determined that lake water recharge derived 37.5% from river water, 33.9% from groundwater, and 28.6% from direct precipitation.

Cite This Study

Chen et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2d9c562ede874ec7321 https://doi.org/10.3390/hydrology13090235

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Implication

Isotopic tracing uncovers recharge dynamics and hydrological pathways across water bodies, highlighting substantial groundwater and river inflow contributions.

Stable Isotope Tracing of Water Sources and Recharge Contributions to Qinghai Lake, Northeastern Qinghai–Tibet Plateau

Discussion

Member takes

Implication

Key Points

Cite This Study

Stable Isotope Tracing of Water Sources and Recharge Contributions to Qinghai Lake, Northeastern Qinghai–Tibet Plateau

Discussion

Member takes

Implication

Key Points

Cite This Study

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