Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan
Study Region: Lake Kasumigaura, a shallow, hypereutrophic lake in Japan. Study focus: Because nitrate (NO3–) is an oxidant, it suppresses the release of PO43- from bottom sediments through its role in the oxidation/reduction reactions of Fe. We investigated whether NO3- can suppress the release of P...
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| Language: | English |
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Elsevier
2025-04-01
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| Series: | Journal of Hydrology: Regional Studies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581825000576 |
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| author | Ryuichiro Shinohara Kenji Tsuchiya Ayato Kohzu |
| author_facet | Ryuichiro Shinohara Kenji Tsuchiya Ayato Kohzu |
| author_sort | Ryuichiro Shinohara |
| collection | DOAJ |
| description | Study Region: Lake Kasumigaura, a shallow, hypereutrophic lake in Japan. Study focus: Because nitrate (NO3–) is an oxidant, it suppresses the release of PO43- from bottom sediments through its role in the oxidation/reduction reactions of Fe. We investigated whether NO3- can suppress the release of PO43- at Lake Kasumigaura. New hydrological insights for the region: Sediment analyses revealed no significant correlation between porewater NO3– concentrations and either PO43– concentrations or the fluxes of PO43– from the sediments. Furthermore, the porewater NO3– concentration was approximately 0 mg N L–1 at depths below the sediment surface. We further observed that the relationship between oxidation-reduction potential (ORP) and Fe concentrations exhibited U-shaped characteristics. The oxidation and reduction reactions of Fe appeared to occur at depths below 10 cm, significantly deeper than the layers where PO43⁻ release takes place. The negligible concentration of NO3– in the sediment porewater, as well as the relationship between Fe and P species, appears to reflect that NO3- did not suppress PO43- release from sediment at Lake Kasumigaura. |
| format | Article |
| id | doaj-art-f03b7695d3c44f1aae4228c6bd4b8777 |
| institution | Kabale University |
| issn | 2214-5818 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj-art-f03b7695d3c44f1aae4228c6bd4b87772025-02-09T05:00:29ZengElsevierJournal of Hydrology: Regional Studies2214-58182025-04-0158102233Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, JapanRyuichiro Shinohara0Kenji Tsuchiya1Ayato Kohzu2Corresponding author.; Regional Environment Conservation Division, National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305–8506, JapanRegional Environment Conservation Division, National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305–8506, JapanRegional Environment Conservation Division, National Institute for Environmental Studies, 16–2 Onogawa, Tsukuba, Ibaraki 305–8506, JapanStudy Region: Lake Kasumigaura, a shallow, hypereutrophic lake in Japan. Study focus: Because nitrate (NO3–) is an oxidant, it suppresses the release of PO43- from bottom sediments through its role in the oxidation/reduction reactions of Fe. We investigated whether NO3- can suppress the release of PO43- at Lake Kasumigaura. New hydrological insights for the region: Sediment analyses revealed no significant correlation between porewater NO3– concentrations and either PO43– concentrations or the fluxes of PO43– from the sediments. Furthermore, the porewater NO3– concentration was approximately 0 mg N L–1 at depths below the sediment surface. We further observed that the relationship between oxidation-reduction potential (ORP) and Fe concentrations exhibited U-shaped characteristics. The oxidation and reduction reactions of Fe appeared to occur at depths below 10 cm, significantly deeper than the layers where PO43⁻ release takes place. The negligible concentration of NO3– in the sediment porewater, as well as the relationship between Fe and P species, appears to reflect that NO3- did not suppress PO43- release from sediment at Lake Kasumigaura.http://www.sciencedirect.com/science/article/pii/S2214581825000576PO43– releaseIron (Fe)EutrophicationSediment monitoring |
| spellingShingle | Ryuichiro Shinohara Kenji Tsuchiya Ayato Kohzu Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan Journal of Hydrology: Regional Studies PO43– release Iron (Fe) Eutrophication Sediment monitoring |
| title | Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan |
| title_full | Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan |
| title_fullStr | Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan |
| title_full_unstemmed | Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan |
| title_short | Does nitrate suppress phosphorus release from sediment? A case study in Lake Kasumigaura, Japan |
| title_sort | does nitrate suppress phosphorus release from sediment a case study in lake kasumigaura japan |
| topic | PO43– release Iron (Fe) Eutrophication Sediment monitoring |
| url | http://www.sciencedirect.com/science/article/pii/S2214581825000576 |
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