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Fluxes and mechanisms of phosphorus release from sediments in seasonal hypoxic reservoirs: a simulation-based experimental study

  • Sediment Environment and Pollution Control 2020
  • Published:
Journal of Soils and Sediments Aims and scope Submit manuscript

Abstract

Purpose

Internal phosphorus (P) input has been proven to be an important cause of eutrophication. The purpose of this study is to explore the process and mechanism of P release from sediments in seasonal hypoxic reservoirs.

Material and methods

Six sediment cores were collected from Hongfeng Reservoir, one of the largest reservoirs in southwestern China. Incubation experiments were conducted using the sediment cores under aerobic and anaerobic conditions. The diffusion gradients in thin films (DGT) technique was employed to determine the concentration profiles and release characteristics of labile-P and labile-Fe at the sediment–water interface. The microbial community structure in surface sediments was determined by 16S rRNA sequencing.

Results and discussion

Compared with the aerobic condition, the P release flux was ~3.75 times under anaerobic condition, which mainly came from BD-P and NaOH-P. In addition, DGT-P and DGT-Fe were significantly positively correlated (R2 > 0.66, p < 0.001). From 16S rRNA sequencing, SRB and PSB were shown to promote P release through sulfate reduction and P dissolution in sediments. Moreover, the control measures of internal P release are discussed due to the potential risk of it in deep-water reservoirs.

Conclusion

Dissolved oxygen is the key control factor of P release; thus, anaerobic conditions promoted the release of P from sediments. Fe-P reduction and dissolution are the main processes. SRB and PSB played an important role in the P cycle of sediments. It is necessary to increase oxygen in seasonal hypoxic reservoirs to reduce the risk of internal P release.

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Funding

This study was sponsored jointly by the Strategic Priority Research Program of CAS (No. XDB40020400), the Chinese NSF Joint Fund Project (No. U1612441), the Chinese NSF project (No. 41773145, 41977296), the Guizhou Science and Technology Project of China (No. [2019]2-9), the Youth Innovation Promotion Association CAS (No. 2019389), and the CAS Interdisciplinary Innovation Team.

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Authors and Affiliations

  1. College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, People’s Republic of China

    Xiaohong Yang, Ruixue Zhang & Kangkang He

  2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, People’s Republic of China

    Xiaohong Yang, Jingfu Wang, Kangkang He & Jingan Chen

  3. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Jingfu Wang & Jingan Chen

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  1. Xiaohong Yang
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  2. Ruixue Zhang
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Contributions

Xiaohong Yang: conceptualization, methodology, investigation, writing—original draft, writing—review and editing. Ruixue Zhang: investigation, writing—review and editing. Jingfu Wang: conceptualization, methodology, resources, writing—review and editing, funding acquisition. Kangkang He: investigation, formal analysis. Jingan Chen: investigation, writing—review and editing.

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Correspondence to Jingfu Wang.

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Yang, X., Zhang, R., Wang, J. et al. Fluxes and mechanisms of phosphorus release from sediments in seasonal hypoxic reservoirs: a simulation-based experimental study. J Soils Sediments 21, 3246–3258 (2021). https://doi.org/10.1007/s11368-021-02946-7

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