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In situ, high-resolution evidence of phosphorus release from sediments controlled by the reductive dissolution of iron-bound phosphorus in a deep reservoir, southwestern China
Quan Chen;  Jingan Chen;  Jingfu Wang;  Jianyang Guo;  Zuxue Jin;  Pingping Yu;  Zhenzhen Ma
2019
发表期刊Science of The Total Environment
卷号666页码:39-45
摘要

Reservoirs in southwestern China are encountering the challenge of eutrophication, in which internal phosphorus (P) release from sediments plays an important role. Studies on the high-resolution profile variations and release mechanisms of P at the sediment-water interface (SWI) are rare in these reservoirs until now. In this study, monthly monitoring (Nov 2017 to Oct 2018) using a composite diffusive gradient in thin films (DGT) technique was taken to determine the temporal and vertical profile variations of the DGT-labile P (Fe) at the SWI in Hongfeng Reservoir. The results showed that the average concentrations of the DGT-labile P (Fe) in surface sediments were 0.63 ± 0.24 mg·L−1 and 4.61 ± 1.12 mg·L−1, respectively, with significantly higher concentrations during the summer anoxic period than that during the winter aerobic period. The DGT-labile P (Fe) concentrations in sediments presented a significant positive correlation (r2 > 0.70, p < 0.001), supporting the simultaneous release of reactive P and reactive Fe from the sediments and indicating that the reductive dissolution of iron-bound P dominates the P release from sediments. The release rates of P ranged from 0.01 mg·m−2·d−1 to 0.83 mg·m−2·d−1 (mean: 0.22 mg·m−2·d−1) in Hongfeng Reservoir, which are higher than that in heavily eutrophic shallow lakes in eastern China, such as Lake Taihu. There is a higher P loading, stronger P reactivity, faster P release rates, and higher pollution potential in deep reservoirs of southwestern China than that in natural shallow lakes of eastern China, highlighting the importance and urgency of treating internal P pollution in deep reservoirs. Further studies on the mechanisms and controlling factors of the coupled Fe-P-S cycle in deep reservoirs are desirable in the future, so as to provide a scientific foundation for exploring effective internal P treatment techniques adaptive to deep reservoirs in southwestern China.

关键词Eutrophication phosphorus sediments diffusive Gradients In thIn Films (Dgt) deep Reservoirs southwestern chIna
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10214
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China
2.University of Chinese Academy of Sciences, Beijing 100049, PR China
3.College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, PR China
4.Xi'an University of Science and Technology, Xi'an 710054, PR China
推荐引用方式
GB/T 7714
Quan Chen;Jingan Chen;Jingfu Wang;Jianyang Guo;Zuxue Jin;Pingping Yu;Zhenzhen Ma. In situ, high-resolution evidence of phosphorus release from sediments controlled by the reductive dissolution of iron-bound phosphorus in a deep reservoir, southwestern China[J]. Science of The Total Environment,2019,666:39-45.
APA Quan Chen;Jingan Chen;Jingfu Wang;Jianyang Guo;Zuxue Jin;Pingping Yu;Zhenzhen Ma.(2019).In situ, high-resolution evidence of phosphorus release from sediments controlled by the reductive dissolution of iron-bound phosphorus in a deep reservoir, southwestern China.Science of The Total Environment,666,39-45.
MLA Quan Chen;Jingan Chen;Jingfu Wang;Jianyang Guo;Zuxue Jin;Pingping Yu;Zhenzhen Ma."In situ, high-resolution evidence of phosphorus release from sediments controlled by the reductive dissolution of iron-bound phosphorus in a deep reservoir, southwestern China".Science of The Total Environment 666(2019):39-45.
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