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Risk and mechanisms of phosphorus release at the sediment–water interface of lakes in cold and arid regions during non-frozen seasons

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Abstract

In recent years, the eutrophication of lakes has accelerated in cold arid regions; the release of nutrients from sediments is an important contributor. The sequential extraction method, high-resolution peeper (HR-Peeper), and diffusive gradients in thin films (DGT) techniques were used to study the occurrence characteristics, release risk, and release mechanism of phosphorus (P) at the sediment–water interface (SWI) of Ulanor Wetland in the Hulun Lake Basin, Inner Mongolia, China. The mean total P concentration in overlying water was lower in August than that in May. Dissolved organic P (DOP) or particulate P (PP) was the main form of P in the overlying water. PP dominates in May and DOP in August. Refractory P was the main form of P in sediments. The concentrations of soluble reactive P and DGT-active P in the pore water of the sediment column were higher than those in the overlying water, and the concentrations were higher in August than those in May. Release of P in the wetland sediments occurred during the non-frozen seasons, with a higher risk in August than in May. The good linear correlation between dissolved P, Fe, and Mn in the DGT profiles verified their co-release due to the anaerobic reduction of Fe/Mn oxides. Moreover, alkaline sediments are also conducive to the release of sediment P. This study can provide data and theoretical support for eutrophication control in Ulanor Wetland and other similar water bodies in cold and arid regions.

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The datasets used and/or analyzed in the study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank the participants in this study for their time and useful insights. This work was supported by the National Key Research and Development Program of China (No. 2022YFC3204005) and the National Natural Science Foundation of China (No. 4227071576).

Funding

This work was supported by the National Key Research and Development Program of China (Program No. 2022YFC3204005) and the National Natural Science Foundation of China (No. 4227071576).

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Qi Fei collected and analyzed samples and was a major contributor to writing the manuscript. Zhanqi Zhou and Mengze Li collected and analyzed the samples. Wei Li formulated the sampling scheme. Wenwen Wang and Shuhang Wang formulated the experimental scheme and checked the quality of the paper. All authors read and approved the final manuscript.

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Correspondence to Wenwen Wang.

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Fei, Q., Li, W., Wang, S. et al. Risk and mechanisms of phosphorus release at the sediment–water interface of lakes in cold and arid regions during non-frozen seasons. Environ Sci Pollut Res 31, 23579–23590 (2024). https://doi.org/10.1007/s11356-024-32704-4

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  • DOI: https://doi.org/10.1007/s11356-024-32704-4

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