Unforeseen nitrate accumulation under nutrient mitigation measures in the east Pearl River Estuary: Phenomenon, drivers and implications

Wang, Linlin; Lei, Xiaoyu; Zhou, Yang; Mao, Xian-zhong; Han, Jing-Cheng; Li, Bing; Huang, Yuefei; Zhao, Runqi; Bi, Hongsheng; Tang, Zhaozhao; Wang, Yongqiang; Li, Hailong

doi:10.1016/j.ejrh.2023.101554

Journal of Hydrology: Regional Studies

2023

DOI: 10.1016/j.ejrh.2023.101554

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Unforeseen nitrate accumulation under nutrient mitigation measures in the east Pearl River Estuary: Phenomenon, drivers and implications

Linlin Wang,

Xiaoyu Lei,

Yang Zhou

et al.

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2024

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Cited by 2 publications

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Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy

Wang,

Shao,

Guo

et al. 2024

Journal of Environmental Management

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Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy

Wang,

Shao,

Guo

et al. 2024

Journal of Environmental Management

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Analysis of Nitrogen and Phosphorus Pollution in Shenzhen Bay over the Past 40 Years

Wang,

Feng,

et al. 2024

Water

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Based on 40 years of routine water quality monitoring data from Shenzhen Bay and special intensive monitoring since 2021, we analysed the spatiotemporal variations in nitrogen and phosphorus pollution. The results indicate serious levels of nitrogen and phosphorus pollution in Shenzhen Bay. Although recent trends show a decline in concentrations of inorganic nitrogen and reactive phosphate—with the annual average concentration of inorganic nitrogen dropping below 1.0 mg/L since 2020 and reactive phosphate levels near the bay mouth decreasing to approximately 0.020 mg/L—the overall water quality still does not meet China’s Class IV seawater quality standards. Additionally, water quality is poorer during the rainy season, with the average summer concentration of inorganic nitrogen being over 25% higher than in spring and autumn. The water quality is primarily influenced by land-sourced pollutants and tidal effects, generally, with the concentration of DIN and DIP decreased from the estuary of the Shenzhen River, the main seagoing river, to the bay mouth. Near the river’s mouth, concentrations of inorganic nitrogen and reactive phosphate are approximately six and four times higher, respectively, than those near the bay mouth. Due to current emission standards and sewage disposal methods, the proportion of nitrate nitrogen in DIN has significantly increased, exceeding 80% since 2020. To improve the water quality of Shenzhen Bay and to reduce pollution inputs, coordinated land and marine development activities are recommended.

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Unforeseen nitrate accumulation under nutrient mitigation measures in the east Pearl River Estuary: Phenomenon, drivers and implications

Cited by 2 publications

References 56 publications

Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy

Ecological restoration for eutrophication mitigation in urban interconnected water bodies: Evaluation, variability and strategy

Analysis of Nitrogen and Phosphorus Pollution in Shenzhen Bay over the Past 40 Years

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