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High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments
Gao, Yulu1,3; Liang, Tao1,3; Tian, Shuhan1,3; Wang, Lingqing1; Holm, Peter E.2,3; Hansen, Hans Christian Bruun2,3
2016-12-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume219Pages:466-474
Corresponding AuthorLiang, Tao(liangt@igsnrr.ac.cn)
AbstractA 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 km(2)) experiencing a regional summer algal bloom. Two-dimensional distributions of labile P in sediments were imaged with the ZrOxide 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 (F-d) and release flux (F-r) 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. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordPhosphorus Iron DGT High resolution Sediment-water interface
DOI10.1016/j.envpol.2016.05.053
WOS KeywordDISSOLVED REACTIVE PHOSPHORUS ; THIN-FILMS TECHNIQUE ; RARE-EARTH-ELEMENTS ; DIFFUSIVE GRADIENTS ; IN-SITU ; SHALLOW LAKES ; PORE-WATER ; PHOSPHATE RELEASE ; AEROBIC SEDIMENTS ; MOBILE PHOSPHORUS
Indexed BySCI
Language英语
Funding ProjectNational Key Project for Basic Research[2012CB417004]
Funding OrganizationNational Key Project for Basic Research
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000390734100053
PublisherELSEVIER SCI LTD
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/65309
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLiang, Tao
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China
2.Univ Copenhagen, Dept Plant & Environm Sci, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
3.Sino Danish Ctr Educ & Res, Aarhus, Denmark
Recommended Citation
GB/T 7714
Gao, Yulu,Liang, Tao,Tian, Shuhan,et al. High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments[J]. ENVIRONMENTAL POLLUTION,2016,219:466-474.
APA Gao, Yulu,Liang, Tao,Tian, Shuhan,Wang, Lingqing,Holm, Peter E.,&Hansen, Hans Christian Bruun.(2016).High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments.ENVIRONMENTAL POLLUTION,219,466-474.
MLA Gao, Yulu,et al."High-resolution imaging of labile phosphorus and its relationship with iron redox state in lake sediments".ENVIRONMENTAL POLLUTION 219(2016):466-474.
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