Remobilization mechanism and release characteristics of phosphorus in saline sediments from the Pearl River Estuary (PRE), South China, based on high -resolution measurements

被引:37
作者
Gao, Lei [1 ]
Li, Rui [1 ]
Liang, Zuobing [1 ]
Yan, Chang [1 ]
Zhu, Aiping [1 ]
Li, Shaoheng [1 ]
Yang, Zhigang [1 ]
He, Haijun [2 ]
Gan, Huayang [2 ]
Chen, Jianyao [1 ]
机构
[1] Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou 510275, Peoples R China
[2] Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China
基金
中国国家自然科学基金;
关键词
Pearl River Estuary (PRE); Diffusive gradients in thin-films (DGT); Fe-coupled P mobilization; Decoupling of Fe-P cycling; Diffusion flux; IN-SITU; LABILE PHOSPHORUS; PORE-WATER; DISSOLVED SULFIDE; ORGANIC-MATTER; LAKE-SEDIMENTS; IRON; PHOSPHATE; MOBILIZATION; SPECIATION;
D O I
10.1016/j.scitotenv.2019.134411
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The internal loading of phosphorus (P) is commonly considered an essential factor contributing to eutrophication in freshwater bodies. However, investigation of the lability and remobilization characteristics of P in estuarine saline sediments has been limited. In this study, a sequential chemical extraction procedure and high-resolution measurement using the diffusive gradients in thin film (DGT) technique were employed to explore the lability, potential remobilization mechanism and release characteristics of sediment P in the Pearl River Estuary (PRE), South China. The P accumulated significantly in sediments along the west coast of the PRE due to the combined effects of terrestrial P inputs and specific hydrological conditions. The geochemical fractions of sediment P followed the order of organic P (Org-P) (mean: 58.6%) > iron-bound P (Fe-P) (23.4%) > calcium-bound P (Ca-P) (17.4%) > loosely bound P (LS-P) (0.63%). Synchronous vertical variations in DGT-labile Fe and Pin the upper and middle parts of the sediment profiles confirmed that Fe-coupled P mobilization occurred in saline sediments. In contrast, sulfate reduction in bottom sediments supposed to decouple the Fe-P cycling relationship. Additionally, the formation of an "iron curtain" (Fe oxyhydroxides) in the oxic surface sediments efficiently prevented upward diffusion of P, leading to relatively low effluxes of P (0.098-6.59 ng cm 2 d 1) across the sediment-water interface. (C) 2019 Elsevier B.V. All rights reserved.
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页数:11
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