Promoting effect of raft-raised scallop culture on the formation of coastal hypoxia

Sun, Xiyan; Gao, Xuelu; Zhao, Jianmin; Xing, Qianguo; Liu, Yongliang; Xie, Lei; Wang, Yongjie; Wang, Bin; Lv, Jiasen

doi:10.1016/j.envres.2023.115810

Cited by 7 publications

(1 citation statement)

References 89 publications

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“…Nutrient concentrations were determined through the colorimetric method on a SEAL QuAAtro 39–SFA analyzer at the Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences (Liu et al., 2019; Sun et al., 2023). The detection limits were 0.02 μmol L −1 for

{{\text{NO}}_{3}}^{-}

, 0.008 μmol L −1 for

{{\text{NO}}_{2}}^{-}

, 0.03 μmol L −1 for

{{\text{NH}}_{4}}^{+}

, 0.01 μmol L −1 for DIP, and 0.02 μmol L −1 for DSi.…”

Section: Methodsmentioning

confidence: 99%

Atypical Seasonality of the Silicon Cycle in the Yellow River Estuary and Bohai Sea Revealed by Stable Silicon Isotopes

Cui,

Liu,

Wang

et al. 2024

Global Biogeochemical Cycles

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Biogeochemical Si cycle in coastal areas is of vital importance due to its close link with the carbon cycle. However, the coastal Si cycle has been heavily perturbated by human activities. In this study, we studied the spatiotemporal distribution of biogenic Si (BSi) and dissolved Si (DSi) combined with stable Si isotopes of DSi (δ30SiDSi) in the Yellow River estuary and Bohai Sea, one of the most populated coastal areas in the world. Over an annual cycle, BSi and DSi concentrations varied from 0 to 43.5 μmol L−1 and from 0.3 to 40 μmol L−1, respectively. This was associated with large δ30SiDSi variations from +0.49 ± 0.22‰ (2sd) in spring to +2.92 ± 0.14‰ in winter, which opposed to observations that summer δ30SiDSi values were usually higher than those in winter. This atypical variation could be attributed to the water‐sediment regulation on the Yellow River occurring every early summer, leading to a strong water mixing pattern and suppressing diatom production in summer. This mixing was further prolonged by extreme autumn rainfall on land. The pulse supply of nutrients subsequently enhanced primary productivity from autumn through winter. In spring, the resuspended seafloor sediments were likely an important DSi source with δ30Si values of <−0.5‰. Our findings suggest that natural Si seasonality has been greatly masked by human activities and climate events in the Bohai Sea. Our study serves as a reference of the Si cycle research endeavors worldwide for revealing the overlaying effect of anthropogenic consequences and natural variability.

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