Study on the characteristics and diffusion fluxes of nutrients and metal elements in shallow sediment porewater of Shenzhen Bay and Maozhou River

Luo Manhua; Zhang Licong; Li Hailong; Guo Yuehua; Xiao Kai

doi:10.12284/hyxb2022162

Volume 44 Issue 8

Aug. 2022

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Luo Manhua，Zhang Licong，Li Hailong, et al. Study on the characteristics and diffusion fluxes of nutrients and metal elements in shallow sediment porewater of Shenzhen Bay and Maozhou River[J]. Haiyang Xuebao，2022, 44(8)：11–22 doi: 10.12284/hyxb2022162

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Study on the characteristics and diffusion fluxes of nutrients and metal elements in shallow sediment porewater of Shenzhen Bay and Maozhou River

doi: 10.12284/hyxb2022162

Luo Manhua^{1, 2
,},
Zhang Licong²,
Li Hailong^{1, 2},
Guo Yuehua³,
Xiao Kai^{2
,
,}

1.
School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
2.
School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
3.
CCCC-FHEC Ecological Engineering Co. Ltd., Shenzhen 518107, China

Received Date: 2022-03-17
Rev Recd Date: 2022-04-25

Available Online: 2022-05-16

Publish Date: 2022-08-15

Abstract

Abstract

In order to understand the distribution characteristics, relationships and diffusion fluxes of nutrients and metal elements across the sediment-water interface, we investigated the vertical profiles of nutrients and metal elements through the diffusive gradient in thin-films (DGT) technology in Shenzhen Bay (SZB) and Maozhou River (MZR). The two-dimensional high-resolution available sulfur (DGT-labile S) distributions were also synchronously measured. The results showed that the mean concentrations of ${\rm{NH}}_4^+ $, P and S²⁻ and heavy metals of Cd, Co, Cu, Fe, Ni, Pb and Zn in porewater of MZR were significantly higher than those in the overlying water and the SZB, except for ${\rm{NO}}_3^- $ and Mo. The pollution degree of nutrients and metal elements in porewater of MZR was generally higher than that in SZB, but the pollutants of nutrients and metal elements in SZB were more than those in MZR. The spatial distribution of DGT-labile S in MZR indicated the distinguish bioturbation-induced tubes, which enhanced the spatial heterogeneity and led the increasing of solute concentrations with sediment depths. The diffusion fluxes of nutrients and metal elements ranged from −0.27 μg/(cm²·d) to 0.0065 μg/(cm²·d) in SZB, and from −0.061μg/(cm²·d) to 0.069 μg/(cm²·d) in MZR.
- Shenzhen,
- diffusive gradient in thin-films,
- sediment,
- nutrients,
- heavy metals

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References

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