Field-Scale Suppression of Cyanobacterial Blooms by Cationic Polymer-Modified Local Soil: Selective Inactivation Mechanism and Ecological Responses
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Le résumé fourni par la source
Harmful cyanobacterial blooms require control strategies that suppress bloom-forming taxa while limiting effects on non-target primary producers and toxin-related risks. We developed a cationic polyquaternium (P126)-engineered local red-soil composite and evaluated its electrokinetic properties, taxon-dependent photophysiological effects, activity against colonial Microcystis, robustness to water chemistry, short-term Danio rerio responses, and field-scale performance. P126 modification reversed soil surface charge to the range of +20 to +33 mV across a pH range of 6.0–10.0, generating a strong electrostatic contrast with negatively charged cyanobacteria. At 10 mg L−1, the composite suppressed maximum photosystem II quantum yield (Fv/Fm) in Microcystis aeruginosa and Dolichospermum sp., with no statistically detectable effects on the four tested chlorophyte and diatom strains. For Microcystis colonies ≥ 500 μm, 20 mg L−1 of composite achieved >95% MTT-based inhibition within 24 h, versus < 15% for CuSO4. Suppression persisted across the tested pH and nutrient ranges but was attenuated by high humate concentrations. The maximum unfractionated-sample ELISA microcystin-equivalent signal was approximately 25% lower than with CuSO4; however, dissolved and particulate fractions were not resolved. No statistically detectable treatment-related differences in zebrafish hatching or larval length were observed up to 10.5 mg L−1. In a physically isolated sub-lake, composite application preceded a decline of more than three orders of magnitude in algal/cyanobacterial density and an increase in Secchi depth from approximately 0.25 to 1.2 m; Vallisneria natans was planted subsequently. These results provide laboratory evidence and field case-study observations consistent with electrostatically favored, selective bloom suppression, while residual-polymer fate, sediment effects, chronic toxicity, and multi-trophic responses require further evaluation.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Field-Scale Suppression of Cyanobacterial Blooms by Cationic Polymer-Modified Local Soil: Selective Inactivation Mechanism and Ecological Responses
- Date Crossref
- 21/09/2026
- Éditeur
- MDPI AG
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Jiangxi Provincial Institute of Water Sciences pays non établi dans la noticeStructure de recherche
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Chinese Academy of Sciences pays non établi dans la noticeOrganisme public
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Institute of Hydrobiology pays non établi dans la noticeStructure de recherche
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China University of Geosciences pays non établi dans la noticeUniversité ou école supérieure
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Jiangxi Normal University pays non établi dans la noticeUniversité ou école supérieure
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Key Laboratory of Watershed Soil and Water Conservation pays non établi dans la noticeStructure de recherche
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Faculty of Materials Science and Chemistry pays non établi dans la noticeUniversité ou école supérieure
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College of Life Science pays non établi dans la noticeUniversité ou école supérieure
Jiangxi Provincial Institute of Water Sciences, Chinese Academy of Sciences et Institute of Hydrobiology, avec 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.