Long-term regional nutrient contributions and in-lake water quality trends for Lake Okeechobee

IF 1.1 4区环境科学与生态学 Q4 LIMNOLOGY

Lake and Reservoir Management Pub Date : 2020-09-21 DOI:10.1080/10402381.2020.1809036

Sayena Faridmarandi, Y. Khare, G. Naja

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引用次数: 7

Abstract

Abstract Faridmarandi S, Khare YP, Naja GM. 2020. Long-term regional nutrient contributions and in-lake water quality trends for Lake Okeechobee. Lake Reserv Manage. XX:XXX–XXX. A long-term dataset was used to investigate the historical regional changes in Lake Okeechobee water quality from water year 1974 to 2018. During this period, the total phosphorus (TP) load from the northern region to the lake remained statistically stable while the in-lake TP concentrations showed a statistically significant increasing trend, despite decades of state plans to restore this ecosystem. During the investigated period of record, the inflow TP flow weighted mean concentration from the southern region had a slightly higher value of 0.191 mg/L (when compared to the northern region) with a statistically significant increasing trend. The average annual total nitrogen unit area inflow loading (678.6 kg/km2) and flow weighted mean concentration (4.35 mg/L) into Lake Okeechobee from the southern region had the highest levels when compared to other regions. Lake Okeechobee TP sedimentation rate showed a statistically significant decreasing trend indicating a reduction in the capacity of the lake sediments to assimilate phosphorus. Results showed that the lake sediments may become a continuous source of phosphorus in water year 2035. Sustained and long-term efforts on the scale of decades will be required for restoring the lake using a multipronged approach consisting of mainly the implementation of nutrient/fertilizer best management practices and the construction of ∼200 km2 of constructed wetlands for a total project cost of US$4.26 billion. Unless a proven cost-effective technology is developed to tackle the legacy TP problem in the lake sediments, a prioritization of state resources is required while focusing on Lake Okeechobee watershed.

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Okeechobee湖的长期区域养分贡献和湖内水质趋势

摘要Faridmarandi S，哈雷YP，纳贾GM.2020。Okeechobee湖的长期区域营养成分贡献和湖内水质趋势。湖泊保护区管理。XX： XXX–XXX。使用长期数据集调查1974年至2018年奥基乔比湖水质的历史区域变化。在此期间，尽管国家几十年来一直计划恢复该生态系统，但从北部地区到湖泊的总磷（TP）负荷在统计上保持稳定，而湖中TP浓度在统计上呈显著增加趋势。在调查记录期内，来自南部地区的流入TP流量加权平均浓度值略高，为0.191 mg/L（与北部地区相比），具有统计学上显著的增加趋势。年均总氮单位面积入流负荷（678.6 kg/km2）和流量加权平均浓度（4.35 mg/L）与其他地区相比具有最高水平。Okeechobee湖TP沉积速率呈统计学显著下降趋势，表明湖泊沉积物吸收磷的能力降低。结果表明，2035年湖泊沉积物可能成为磷的连续来源。恢复湖泊需要数十年的持续和长期努力，采用多管齐下的方法，主要包括实施营养/肥料最佳管理实践和建造约200 平方公里的人工湿地，项目总成本为42.6亿美元。除非开发出一种经证明具有成本效益的技术来解决湖泊沉积物中遗留的TP问题，否则在关注Okeechobee湖流域的同时，需要对国家资源进行优先排序。

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来源期刊

Lake and Reservoir Management 环境科学-海洋与淡水生物学

自引率

6.70%

发文量

期刊介绍： Lake and Reservoir Management (LRM) publishes original, previously unpublished studies relevant to lake and reservoir management. Papers address the management of lakes and reservoirs, their watersheds and tributaries, along with the limnology and ecology needed for sound management of these systems. Case studies that advance the science of lake management or confirm important management concepts are appropriate as long as there is clearly described management significance. Papers on economic, social, regulatory and policy aspects of lake management are also welcome with appropriate supporting data and management implications. Literature syntheses and papers developing a conceptual foundation of lake and watershed ecology will be considered for publication, but there needs to be clear emphasis on management implications. Modeling papers will be considered where the model is properly verified but it is also highly preferable that management based on the model has been taken and results have been documented. Application of known models to yet another system without a clear advance in resultant management are unlikely to be accepted. Shorter notes that convey important early results of long-term studies or provide data relating to causative agents or management approaches that warrant further study are acceptable even if the story is not yet complete. All submissions are subject to peer review to assure relevance and reliability for management application.