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High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments.
Environ Pollut. 2016 Dec; 219:466-474.EP

Abstract

A thorough understanding of the labile status and dynamics of phosphorus (P) and iron (Fe) across the sediment-water interface (SWI) is essential for managing internal P release in eutrophic lakes. Fe-coupled inactivation of P in sediments is an important factor which affects internal P release in freshwater lakes. In this study, two in-situ high-resolution diffusive gradients in thin films (DGT) techniques, Zr-Oxide DGT and ZrO-Chelex DGT, were used to investigate the release characteristics of P from sediments in a large freshwater lake (Dongting Lake, China; area of 2691 km2) experiencing a regional summer algal bloom. Two-dimensional distributions of labile P in sediments were imaged with the Zr-Oxide DGT without destruction of the original structure of the sediment layer at four sites of the lake. The concentration of DGT-labile P in the sediments, ranging from 0.007 to 0.206 mg L-1, was highly heterogeneous across the profiles. The values of apparent diffusion flux (Fd) and release flux (Fr) of P varied between -0.027-0.197 mg m-2 d-1 and 0.037-0.332 mg m-2 d-1, respectively. Labile P showed a high and positive correlation (p < 0.01) with labile Fe(II) in the profiles, providing high-resolution evidence for the key role of Fe-redox cycling in labile P variation in sediments.

Authors+Show Affiliations

Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Sino-Danish Center for Education and Research, Denmark.Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Sino-Danish Center for Education and Research, Denmark. Electronic address: liangt@igsnrr.ac.cn.Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China; Sino-Danish Center for Education and Research, Denmark.Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark; Sino-Danish Center for Education and Research, Denmark.Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark; Sino-Danish Center for Education and Research, Denmark.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27376987

Citation

Gao, Yulu, et al. "High-resolution Imaging of Labile Phosphorus and Its Relationship With Iron Redox State in Lake Sediments." Environmental Pollution (Barking, Essex : 1987), vol. 219, 2016, pp. 466-474.
Gao Y, Liang T, Tian S, et al. High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments. Environ Pollut. 2016;219:466-474.
Gao, Y., Liang, T., Tian, S., Wang, L., Holm, P. E., & Bruun Hansen, H. C. (2016). High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments. Environmental Pollution (Barking, Essex : 1987), 219, 466-474. https://doi.org/10.1016/j.envpol.2016.05.053
Gao Y, et al. High-resolution Imaging of Labile Phosphorus and Its Relationship With Iron Redox State in Lake Sediments. Environ Pollut. 2016;219:466-474. PubMed PMID: 27376987.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments. AU - Gao,Yulu, AU - Liang,Tao, AU - Tian,Shuhan, AU - Wang,Lingqing, AU - Holm,Peter E, AU - Bruun Hansen,Hans Christian, Y1 - 2016/07/01/ PY - 2016/01/28/received PY - 2016/05/19/revised PY - 2016/05/19/accepted PY - 2016/7/6/pubmed PY - 2017/2/16/medline PY - 2016/7/6/entrez KW - DGT KW - High resolution KW - Iron KW - Phosphorus KW - Sediment-water interface SP - 466 EP - 474 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 219 N2 - A thorough understanding of the labile status and dynamics of phosphorus (P) and iron (Fe) across the sediment-water interface (SWI) is essential for managing internal P release in eutrophic lakes. Fe-coupled inactivation of P in sediments is an important factor which affects internal P release in freshwater lakes. In this study, two in-situ high-resolution diffusive gradients in thin films (DGT) techniques, Zr-Oxide DGT and ZrO-Chelex DGT, were used to investigate the release characteristics of P from sediments in a large freshwater lake (Dongting Lake, China; area of 2691 km2) experiencing a regional summer algal bloom. Two-dimensional distributions of labile P in sediments were imaged with the Zr-Oxide DGT without destruction of the original structure of the sediment layer at four sites of the lake. The concentration of DGT-labile P in the sediments, ranging from 0.007 to 0.206 mg L-1, was highly heterogeneous across the profiles. The values of apparent diffusion flux (Fd) and release flux (Fr) of P varied between -0.027-0.197 mg m-2 d-1 and 0.037-0.332 mg m-2 d-1, respectively. Labile P showed a high and positive correlation (p < 0.01) with labile Fe(II) in the profiles, providing high-resolution evidence for the key role of Fe-redox cycling in labile P variation in sediments. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/27376987/High_resolution_imaging_of_labile_phosphorus_and_its_relationship_with_iron_redox_state_in_lake_sediments_ DB - PRIME DP - Unbound Medicine ER -