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- Title
MAGNITUDE OF EXTERNAL PHOSPHORUS LOADING LIKELY REDUCES EFFECTIVENESS OF ALUMINUM SULFATE TREATMENTS FOR MANAGEMENT OF SEDIMENT PHOSPHORUS FLUX.
- Authors
Lasater, Abbie L.; Haggard, Brian E.; Ae Lee, Jung
- Abstract
This study quantified sediment P fluxes under aerobic and anaerobic conditions at Quarry Island Cove at Lake Wister, Oklahoma, before and after alum treatments, which occurred five times between 2014 and 2019. Sediment-water cores were collected from the cove and incubated for 10 days at room temperature under aerobic and anaerobic conditions, and P fluxes were estimated as the slope of the increase in P mass over time divided by the area of the core. Aerobic P fluxes were not significantly different before or after alum treatments. Under anaerobic conditions, P fluxes significantly decreased one week after alum treatments compared to a week before treatment. However, after five treatments across six years, sediment P fluxes under anaerobic conditions were not significantly different than prior to any alum treatments in 2010 and 2014 (3 to 4 mg m-2 day-1). The lack of overall improvement in anaerobic P fluxes over time is likely due to the magnitude of P and sediment loads entering Lake Wister from the watershed, where 92% of the total P load to Lake Wister from 2010 to 2020 was from external sources. Therefore, while alum treatments provide short-term reductions in P fluxes, external P sources must be addressed.
- Subjects
OKLAHOMA; ALUMINUM sulfate; SEDIMENTS; PHOSPHORUS; LAKE management; ALUM
- Publication
Journal of the ASABE, 2023, Vol 66, Issue 2, p319
- ISSN
2769-3295
- Publication type
Article
- DOI
10.13031/ja.15284