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| DOI | 10.1016/j.chemgeo.2024.122093 |
| Phosphorus dynamics in an ice-covered lake: Insights from geochemical gradients in water and sediments | |
| 发表日期 | 2024 |
| ISSN | 0009-2541 |
| EISSN | 1872-6836 |
| 起始页码 | 657 |
| 卷号 | 657 |
| 英文摘要 | Understanding the role of seasonally ice-covered lakes in biogeochemical cycling is important for predicting the effects of changing winter conditions. However, little is known about phosphorus (P) cycling and the mechanisms of internal P release in seasonally ice-covered lakes. We investigated under-ice P cycling in a large and temperate lake composed of several basins with significantly different water depths. We used a multifaceted approach, combining analyses of P and total iron (Fe) distributions in sediments, pore water, and the water column. During the winter period, steep gradients of redox-sensitive parameters (i.e., O2 and Eh) formed at the sediment-water interface (SWI) due to minimal water movement and water column hypoxia. P diffusive fluxes during winter are substantial (0.2-4.8 mg P/m2/day). Short-term P release in shallow basins is strongly influenced by Fe reduction. In contrast, decoupling of Fe from P in deep basins suggests that hypoxia does not play a major role in short-term P mobilization. The differences in short-term P release mechanisms can be interpreted in terms of basin depth, stability of thermal stratification and time of water mixing. This ultimately influences the behavior of Fe and P, as well as their speciation and concentration in the sediment and water column. The deep basins in LOW contained higher total phosphorus (TP) and total iron (Fe) in sediments and soluble reactive phosphorus (SRP) in deep water compared to shallow basins. In surface sediments, P bound to the redox-sensitive P binding form (BD-P) is the diagenetically reactive P phase, emphasizing strong coupling with ferric Fe. In contrast, calcium carbonatebound P in surface sediments indicates diagenetic sequestration of P with sediment burial. Overall, this study provides evidence that P cycling remains active in winter, and an understanding of its contribution to the overall ecosystem process is needed to predict how lake ecosystems will behave under climate change. |
| 英文关键词 | Phosphorus; Ice -covered Lake; Lake of the Woods; Sediments; Water |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:001235060100001 |
| 来源期刊 | CHEMICAL GEOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/290898 |
| 作者单位 | University of Toronto; University Toronto Scarborough; Environment & Climate Change Canada; Canada Centre for Inland Waters (CCIW); Natural Resources Canada; Lands & Minerals Sector - Natural Resources Canada; Geological Survey of Canada |
| 推荐引用方式 GB/T 7714 | . Phosphorus dynamics in an ice-covered lake: Insights from geochemical gradients in water and sediments[J],2024,657. |
| APA | (2024).Phosphorus dynamics in an ice-covered lake: Insights from geochemical gradients in water and sediments.CHEMICAL GEOLOGY,657. |
| MLA | "Phosphorus dynamics in an ice-covered lake: Insights from geochemical gradients in water and sediments".CHEMICAL GEOLOGY 657(2024). |
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