Magnitude of External Phosphorus Loading Likely Reduces Effectiveness of Aluminum Sulfate Treatments for Management of Sediment Phosphorus Flux

IF 1.2 4区 农林科学 Q3 AGRICULTURAL ENGINEERING
A. Lasater, B. Haggard, J. A. Lee
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Abstract

Highlights Phosphorus fluxes were quantified before and after alum treatments five times between 2014 and 2019. Phosphorus fluxes were not significantly different from baseline after five treatments spread over six years. Long-term effectiveness of alum treatments was reduced due to large external phosphorus loads. 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. Keywords: Aluminum sulfate, Lake management, Nutrient loads, Phosphorus.
外部磷负荷的大小可能会降低硫酸铝处理管理沉积物磷通量的有效性
在2014年至2019年期间,对明矾处理前后的磷通量进行了五次量化。经过6年5次处理后,磷通量与基线无显著差异。由于外部磷负荷大,明矾处理的长期效果降低。摘要本研究量化了俄克拉荷马州威斯特湖采石场岛湾在明矾处理前后的好氧和厌氧条件下的沉积物P通量,这种情况在2014年至2019年期间发生了五次。从海湾中收集沉积物-水岩心,在室温下在好氧和厌氧条件下孵育10天,并估计P通量为P质量随时间增加的斜率除以岩心的面积。明矾处理前后好氧磷通量无显著差异。在厌氧条件下,与处理前一周相比,明矾处理后一周P通量显著下降。然而,经过6年5次处理,厌氧条件下沉积物P通量与2010年和2014年任何明矾处理前(3 ~ 4 mg m-2 day-1)没有显著差异。随着时间的推移,厌氧磷通量缺乏整体改善可能是由于从流域进入Wister湖的磷和沉积物负荷的大小,其中2010年至2020年,Wister湖总磷负荷的92%来自外部来源。因此,虽然明矾处理能短期减少磷通量,但必须解决外部磷源问题。关键词:硫酸铝,湖泊管理,养分负荷,磷。
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3.10
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