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Mechanisms driving phosphorus release during algal blooms based on hourly changes in iron and phosphorus concentrations in sediments.
Water Res. 2018 04 15; 133:153-164.WR

Abstract

Algal growth causes a drastic change in aquatic conditions over a diel cycle, which may induce sensitive feedback systems in sediments, causing P release. In this study, a microcosm experiment was performed using a suction sampler (Rhizon) to observe changes in soluble reactive phosphorus (SRP) and soluble Fe(II) concentrations in the top 20 mm sediment layer on a 3-h time interval, at different phases of harmful algal bloom (HAB) development. The results showed that the algal blooms prevailed up to 15 days after incubation, after which the process of bloom collapse proceeded until the 70th day. The concentrations of pore-water soluble Fe(II) and SRP increased throughout the incubation period. Compared to day 1, maximum increases of 214% in soluble Fe(II) and 387% in SRP were observed at night during the bloom and collapse periods, respectively. The diffusive fluxes of Fe and P at the sediment-water interface (SWI) generally corresponded to their changes in concentrations. Hourly fluctuation in soluble Fe(II) and SRP concentrations were observed with two distinct concentration peaks occurred at 21:00 p.m. and 06:00 a.m. (or 03:00 a.m.), respectively. These findings suggest that Fe-P coupling mechanisms are responsible for the release of P from sediments. During the collapse period, soluble Fe(II) concentrations were suppressed by the increase of labile S(-II) at night. Meanwhile, SRP concentrations were decoupled from Fe cycling with small fluctuations (<11% RSD) on an hourly timescale, and the decomposition of algae was a dominant source contributing to the release of P from sediments. These results significantly improved the understanding of processes and mechanisms behind the stimulated release of P from sediments during HABs.

Authors+Show Affiliations

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. Electronic address: smding@niglas.ac.cn.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.School of Resources and Environment, University of Jinan, Jinan 250022, China.School of Resources and Environment, University of Jinan, Jinan 250022, China.International Network for Environment and Health, School of Geography and Archaeology, National University of Ireland, Galway, Ireland.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

29407697

Citation

Chen, Musong, et al. "Mechanisms Driving Phosphorus Release During Algal Blooms Based On Hourly Changes in Iron and Phosphorus Concentrations in Sediments." Water Research, vol. 133, 2018, pp. 153-164.
Chen M, Ding S, Chen X, et al. Mechanisms driving phosphorus release during algal blooms based on hourly changes in iron and phosphorus concentrations in sediments. Water Res. 2018;133:153-164.
Chen, M., Ding, S., Chen, X., Sun, Q., Fan, X., Lin, J., Ren, M., Yang, L., & Zhang, C. (2018). Mechanisms driving phosphorus release during algal blooms based on hourly changes in iron and phosphorus concentrations in sediments. Water Research, 133, 153-164. https://doi.org/10.1016/j.watres.2018.01.040
Chen M, et al. Mechanisms Driving Phosphorus Release During Algal Blooms Based On Hourly Changes in Iron and Phosphorus Concentrations in Sediments. Water Res. 2018 04 15;133:153-164. PubMed PMID: 29407697.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mechanisms driving phosphorus release during algal blooms based on hourly changes in iron and phosphorus concentrations in sediments. AU - Chen,Musong, AU - Ding,Shiming, AU - Chen,Xiang, AU - Sun,Qin, AU - Fan,Xianfang, AU - Lin,Juan, AU - Ren,Mingyi, AU - Yang,Liyuan, AU - Zhang,Chaosheng, Y1 - 2018/01/18/ PY - 2017/09/11/received PY - 2018/01/16/revised PY - 2018/01/17/accepted PY - 2018/2/7/pubmed PY - 2018/8/21/medline PY - 2018/2/7/entrez KW - Diffusive gradients in thin films KW - Eutrophication KW - Harmful algal blooms (HABs) KW - Iron KW - Phosphorus KW - Sediments SP - 153 EP - 164 JF - Water research JO - Water Res VL - 133 N2 - Algal growth causes a drastic change in aquatic conditions over a diel cycle, which may induce sensitive feedback systems in sediments, causing P release. In this study, a microcosm experiment was performed using a suction sampler (Rhizon) to observe changes in soluble reactive phosphorus (SRP) and soluble Fe(II) concentrations in the top 20 mm sediment layer on a 3-h time interval, at different phases of harmful algal bloom (HAB) development. The results showed that the algal blooms prevailed up to 15 days after incubation, after which the process of bloom collapse proceeded until the 70th day. The concentrations of pore-water soluble Fe(II) and SRP increased throughout the incubation period. Compared to day 1, maximum increases of 214% in soluble Fe(II) and 387% in SRP were observed at night during the bloom and collapse periods, respectively. The diffusive fluxes of Fe and P at the sediment-water interface (SWI) generally corresponded to their changes in concentrations. Hourly fluctuation in soluble Fe(II) and SRP concentrations were observed with two distinct concentration peaks occurred at 21:00 p.m. and 06:00 a.m. (or 03:00 a.m.), respectively. These findings suggest that Fe-P coupling mechanisms are responsible for the release of P from sediments. During the collapse period, soluble Fe(II) concentrations were suppressed by the increase of labile S(-II) at night. Meanwhile, SRP concentrations were decoupled from Fe cycling with small fluctuations (<11% RSD) on an hourly timescale, and the decomposition of algae was a dominant source contributing to the release of P from sediments. These results significantly improved the understanding of processes and mechanisms behind the stimulated release of P from sediments during HABs. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/29407697/Mechanisms_driving_phosphorus_release_during_algal_blooms_based_on_hourly_changes_in_iron_and_phosphorus_concentrations_in_sediments_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(18)30054-X DB - PRIME DP - Unbound Medicine ER -