The biogenic elements retention in reservoirs of the Yangtze River basin and effect on the nutrient flux into the sea

Song, Yan; Tong, Meng; Li, Maotian; Liu, Xiaoqiang; Yao, Huikun; Fang, Yixuan; Fan, Chun; Chen, Jing

doi:10.1016/j.gloplacha.2023.104280

Cited by 2 publications

(1 citation statement)

References 76 publications

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“…The Masinga dam results in a decrease by 41% in DSi concentrations of the Tana River (Hughes et al, 2012). Another study shows that DSi delivery by the Yangtze River has been reduced by 61.4% over the past five decades (Song et al, 2023). Eutrophication caused by excessive nutrient load to coastal areas has resulted in an atypical vertical distribution of δ 30 Si DSi with higher values in deep water relative to those in surface water in the central Baltic Sea (Zhang et al, 2019).…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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Coral reefs at Qiziwan National Marine Park in 2023: spatial variability and their relationship with environmental factors

Zhao,

Zhang,

Yang

et al. 2024

Front. Mar. Sci.

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IntroductionIn 2023, a comprehensive survey was conducted at Qiziwan National Marine Park (QZW) to assess marine environmental variables, coral communities, and ecosystem parameters. This study aimed to evaluate the current state of coral ecosystems across different regions within the park.MethodsThe survey covered 19 sampling stations distributed among four regions: Xiaojiao Park, Zhongjiao Park, Dajiao Park, and Shayutang Village. Various marine environmental parameters were measured, and coral species were identified and recorded.ResultsA total of 67 species of reef-building corals belonging to 25 genera were identified. Dominant species included Porites lutea, Goniopora columna, Platygyra sinensis, Favites flexuosa, Galaxea fascicularis, and Acropora millepora. Coral coverage was found to be low at Xiaojiao Park, with high levels of turbidity and dissolved inorganic nitrogen, likely due to the nearby Changhua Port. Dajiao Park's sandy substrate made it unsuitable for coral survival. In contrast, Zhongjiao Park and Shayutang Village exhibited the best coral ecosystems. Redundancy analysis indicated that turbidity and substrate types were significant factors influencing coral distribution.DiscussionThe live coral coverage at Xiaojiao Park, parts of Zhongjiao Park, and Dajiao Park declined from 14.03% in 2017 to 11.73% in 2023. This decline is potentially attributed to frequent marine construction and land use changes. Anthropogenic disturbances appear to have worsened environmental conditions, undermining coral reef survival at QZW.

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The biogenic elements retention in reservoirs of the Yangtze River basin and effect on the nutrient flux into the sea

Cited by 2 publications

References 76 publications

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

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

Coral reefs at Qiziwan National Marine Park in 2023: spatial variability and their relationship with environmental factors

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