Changes in the spatial distribution of total phosphorus in sediment and water column of a shallow subtropical lake

IF 1.1 4区环境科学与生态学 Q4 LIMNOLOGY Lake and Reservoir Management Pub Date : 2023-07-03 DOI:10.1080/10402381.2023.2243606

Paul Julian, Tracey B. Schafer, Matthew J. Cohen, Paul Jones, Todd Z. Osborne

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Abstract

Abstract Julian PJ II, Schafer T, Cohen MJ, Jones P, Osborne TZ. 2023. Changes in the spatial distribution of total phosphorus in sediment and water column of a shallow subtropical lake. Lake Reserv Manage. 39:213–230. In shallow lakes, interactions between bed sediment and the water column strongly influence the availability and transport of nutrients. Lake Okeechobee, in South Florida, is a eutrophic, shallow, polymictic lake that exhibits frequent mixing of the water column and resuspension of unconsolidated sediments. The objective of this study was to evaluate the temporal and spatial patterns of water and sediment characteristics and evaluate the linkage of sediment and water column total phosphorus (TP) concentrations. Spatiotemporal generalized additive models identified key periods during which both surface water total suspended solids (TSS) and TP increased, corresponding to hurricane and tropical storm activity. Our models identified regions with persistently greater water column concentrations than the lake average, indicating potential hot spots in resuspension processes and/or internal loading. Sediment bulk density (BD) and TP were inversely correlated, indicating that light, less dense sediments have greater TP concentrations, potentially contributing to the redistribution of sediments and P. An integrated evaluation of surface water and sediment characteristics using a generalized additive model revealed that sediment TP strongly influences water column TP concentrations, potentially explaining the spatial distribution of surface water TP concentrations. The area of the lake with sediment TP concentration ≤500 mg/kg is increasing while the low bulk density sediments area is decreasing, marking a potential improvement in sediment conditions. If this trend persists, it indicates that the lake is increasingly storing P in sediments that can resist entrainment, with significant implications for assessing the trajectory of lake restoration.

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亚热带浅水湖泊沉积物和水柱中总磷的空间分布变化

摘要Julian PJ II，Schafer T，Cohen MJ，Jones P，Osborne TZ.2023。亚热带浅水湖泊沉积物和水柱中总磷的空间分布变化。湖泊保护区管理。39:213-230。在浅水湖泊中，河床沉积物和水柱之间的相互作用强烈影响营养物质的可用性和运输。位于南佛罗里达州的Okeechobee湖是一个富营养化、浅层、多成分的湖泊，其水柱频繁混合，松散沉积物重新悬浮。本研究的目的是评估水和沉积物特征的时间和空间模式，并评估沉积物与水柱总磷（TP）浓度的联系。时空广义加性模型确定了地表水总悬浮固体（TSS）和TP增加的关键时期，与飓风和热带风暴活动相对应。我们的模型确定了水柱浓度持续高于湖泊平均值的区域，表明再悬浮过程和/或内部负荷中存在潜在热点。沉积物堆积密度（BD）和TP呈负相关，表明轻质、密度较小的沉积物具有更高的TP浓度，可能有助于沉积物和P的重新分布。使用广义加性模型对地表水和沉积物特性进行的综合评估表明，沉积物TP强烈影响水柱TP浓度，潜在地解释了地表水TP浓度的空间分布。沉积物TP浓度≤500的湖泊面积 mg/kg在增加，而低堆积密度沉积物面积在减少，这标志着沉积物条件的潜在改善。如果这种趋势持续下去，这表明该湖越来越多地将磷储存在能够抵抗夹带的沉积物中，这对评估湖泊恢复的轨迹具有重要意义。

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

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6.70%

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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.