Induction and Effects of Suspended Particles on the Denitrification Potential within Overlying Water of Sediments in Jiaozhou Bay

ZENG Jian; CHEN Bao-hong; SHI Guo-zong; GUAN Yan-yun; ZHUO Ze-sheng; YE Zhi-xiong

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ZENG Jian，CHEN Bao-hong，SHI Guo-zong, et al. Induction and Effects of Suspended Particles on the Denitrification Potential within Overlying Water of Sediments in Jiaozhou Bay[J]. Haiyang Xuebao，2025, 47(x)：1–10

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Induction and Effects of Suspended Particles on the Denitrification Potential within Overlying Water of Sediments in Jiaozhou Bay

ZENG Jian^{1, 2, 3
,
,},
CHEN Bao-hong⁴,
SHI Guo-zong^{1, 2, 3},
GUAN Yan-yun^{1, 2, 3},
ZHUO Ze-sheng¹,
YE Zhi-xiong¹

1.
Xiamen Ocean Vocational College, Xiamen 361100, China
2.
Applied Technology Engineering Center of Fujian Provincial Higher Education for Marine Resource Protection and Ecological Governance, Xiamen 361100, China
3.
Xiamen Key Laboratory of Intelligent Fishery, Xiamen 361100, China
4.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361002, China

Available Online: 2025-07-07

Abstract

Abstract

The influence of suspended particulate matters (SPM) on denitrifying metabolism and potential of nearshore waters were investigated in the sea area outside Dagu River estuary and southern mouth of Jiaozhou Bay based on ¹⁵N-isotopic tracing incubation experiments. Sediment cores and overlying waters were collected from two sampling sites and then incubated under in situ conditions and simulated SPM gradient (i.e., 50 mg/L, 100 mg/L, 150 mg/L, 200 mg/L, 300 mg/L and 400 mg/L in setting concentration). Detection of denitrification rates combined with relative abundances of narG and nirS genes measurement were conducted to reveal the denitrification potential. The results showed that significant denitrification occurred in all incubations. Under SPM gradient simulated condition, the denitrifying rates as well as narG and nirS gene abundances increased with SPM concentrations, and the abundance of particle-associated denitrifying bacteria probably played a dominated role on potential enhancement, implying that SPM should act as important media on promoting denitrification potential in the Jiaozhou Bay waters. The variance between two study sites was obvious with denitrification rate measured in estuary area being higher than that in southern mouth, while the functional gene abundances just the opposite. It could be well explained by the composition and grain size difference of the SPM, indicating a complicated regulation of SPM to the denitrification potential in Jiaozhou Bay waters. This study suggests that SPM will expand the spatial activity of denitrifying metabolism and then more release the denitrification potential in the nearshore ecosystem, which is ecologically meaningful for the relief of eutrophication level and risk in coastal environments.
- Jiaozhou Bay,
- suspended particulate matters,
- denitrification potential,
- functional gene abundance

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References(47)

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