DOI: 10.1016/j.watres.2018.01.040
Scopus记录号: 2-s2.0-85041397837
论文题名: Mechanisms driving phosphorus release during algal blooms based on hourly changes in iron and phosphorus concentrations in sediments
作者: Chen M. ; Ding S. ; Chen X. ; Sun Q. ; Fan X. ; Lin J. ; Ren M. ; Yang L. ; Zhang C.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 133 起始页码: 153
结束页码: 164
语种: 英语
英文关键词: Diffusive gradients in thin films
; Eutrophication
; Harmful algal blooms (HABs)
; Iron
; Phosphorus
; Sediments
Scopus关键词: Algae control
; Eutrophication
; Iron
; Phosphorus
; Sediments
; Toxic materials
; Diffusive gradients in thin films
; Harmful algal blooms
; Incubation periods
; Microcosm experiments
; Phosphorus concentration
; Phosphorus release
; Sediment water interface
; Soluble reactive phosphorus
; Iron compounds
; ferrous ion
; phosphorus
; iron
; phosphorus
; concentration (composition)
; decomposition
; environmental gradient
; eutrophication
; film
; growth
; iron
; phosphorus
; sediment pollution
; sediment-water interface
; algal bloom
; algal growth
; Article
; controlled study
; cycling
; decomposition
; incubation time
; microcosm
; nonhuman
; priority journal
; sediment
; analysis
; eutrophication
; lake
; water pollutant
; algae
; Eutrophication
; Geologic Sediments
; Iron
; Lakes
; Phosphorus
; Water Pollutants, Chemical
英文摘要: 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. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112937
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China; University of Chinese Academy of Sciences, Beijing, 100049, 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
Recommended Citation:
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[J]. Water Research,2018-01-01,133