The abstract is read at the publisher; the summary is JClub's.
In Dawangtan Reservoir surface sediments (South China), mean potential ecological risk index RI is 157.27 (moderate), with Cd and Hg as dominant contributors.
- Why it matters: It remains unclear whether nutrient enrichment is consistently linked to heavy-metal ecological risk in drinking-water reservoir sediments, and whether any linkage reflects shared sources or sedimentary environmental mediation.
- What they did: The study analyzed eight heavy metals and nutrients from 144 surface sediment samples, using geo-accumulation index, RI, PMF, K-means clustering, and random forest–SHAP to separate source and environmental drivers.
- The result: As and Cu are positively associated with TN and TP via agricultural non-point sources, while Cd and Hg show weak nutrient correlations but are enriched in the high nutrient–high risk class, differentiated mainly by pH and organic matter (OM).
The findingWhy it mattersWhat they didThe result
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