Composition and Distributions of Nitrogen and Phosphorus and Assessment of Eutrophication Status in the Maowei Sea

Lu, Dongliang; Huang, Xiaozhen; Yang, Bin; Dan, Solomon Felix; Kang, Zhenjun; Zhou, Jiaodi; Lao, Yanling; Zhong, Qiuping; Wu, Heng

doi:10.1007/s11802-021-4557-y

Cited by 17 publications

(4 citation statements)

References 59 publications

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“…or Re-floating SPM (or POC, PON) Fluxes (mg/m 2 /day) = CSPM × (PPOC or PPON) × VTrap × 1/STrap × 1/D (2) where CSPM is the SPM concentrations (mg/L) obtained from the bottom sampling bottles of each trap; PPOC or PPON are the percentile concentrations (dimensionless) of POC or PON relative to SPM; VTrap is a volume (1.6 L) of the bottom bottle; STrap is the area of the trap entrance (0.01 m 2 ); D is the mooring duration (4 days).…”

Section: Deployment Of Sinking and Re-floating Sediment Traps In Bott...mentioning

confidence: 99%

“…Point source, defining any discernible and confined pollutant sources [1], is a primary route for loading the eutrophic substances to marine environments. While eutrophication refers to a status of nutrients, which are supplied exceeding the necessity [2][3][4][5], eutrophication induces phytoplankton blooms, particularly when temperature, light, and micronutrients (e.g., trace metals) also reach optimal levels for phytoplankton growth [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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C, N, and P Mass Balances in the Bottom Seawater–Surface Sediment Interface in the Reducing Environment due to Anoxic Water of Gamak Bay, Korea

Jeong

Kang

Cho

2022

Water

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Current mass balances of C, N, and P were estimated using a model (Fluxin = Fluxout + ΔFlux) from Gamak Bay, Korea, in August 2017, where eutrophication and reducing conditions are prevalent. To examine the current fluxes of particulate organic carbon (POC), nitrogen (PON), and phosphorus (POP), sinking and re-floating sediment traps were deployed, a sediment oxygen demand (SOD) chamber experiment and ex-situ nutrient incubation experiment were conducted, and Fick’s first law of diffusion was applied. The principal component analysis and cluster analysis were performed to identify the three groups of water masses based on the characteristics of the bay, including the effects of the reducing environment due to the anoxic water mass using 14 bottom water quality parameters. In the reducing environment (sampling point GA4), the SOD20 flux was 3047.2 mg O2/m2/d. Additionally, the net sinking POC flux was 861.0 mg C/m2/d, while 131.8% of the net sinking POC flux (1134.5 mg C/m2/d) was removed toward the overlying water. This indicates that the organic matter that had been deposited was decomposed as a flux of 273.6 mg C/m2/d. The net sinking PON flux was 187.9 mg N/m2/d, whereas 15.8% of the net sinking PON flux was eluted, and 84.2% remained in the surface sediments. The dissolved inorganic nitrogen (DIN) elution flux from the surface sediments consisted of NH4+ elution (33.7 mg N/m2/d) and NOx− elution (−4.1 mg N/m2/d) fluxes. Despite the net sinking POP flux being 26.0 mg P/m2/d, the 47.7 mg P/m2/d of DIP elution flux (179.5% of the net sinking POP flux) was eluted to the overlying water. Similar to C mass balance, the additional elution flux occurred. Therefore, severe eutrophication (16.5 of the Okaichi eutrophication index) with the lowest N:P ratio (2.6) in GA4 was noted. This indicates that not only the freshly exported organic matter to the surface sediments but also the biochemical processes under anoxic conditions played an essential role as a remarkable nutrient source–particularly P–for eutrophication in Gamak Bay, Korea.

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Section: Deployment Of Sinking and Re-floating Sediment Traps In Bott...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

C, N, and P Mass Balances in the Bottom Seawater–Surface Sediment Interface in the Reducing Environment due to Anoxic Water of Gamak Bay, Korea

Jeong

Kang

Cho

2022

Water

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“…In addition to DIN and DIP used for eutrophication assessment, DON, DOP, Si, and Chl a are employed for seawater status classification. Lu et al (2021) used principal component analysis to evaluate the eutrophication status in Maowei Sea and reported that nitrate and dissolved organic nitrogen were the most influential factors for eutrophication. Trophic status is dependent on the amount of organic material that is present in the water (Bricker et al 2008).…”

Section: Eutrophication Status Based On Nutrient Concentrationmentioning

confidence: 99%

Deepening Knowledge of Nutrient Dynamics in Coastal Waters

Meirinawati

Wahyudi

2022

AJSTD

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Nutrients are important compounds in waterbodies that regulate primary productivity and phytoplankton growth, the basis of food webs. Increased nutrient concentration has become a serious concern because it causes eutrophication and threatens the sustainability of ecosystems. Eutrophication is the process of nutrient enrichment in water bodies that affects their productivity and decreases water quality. Although information about nutrient distribution, limiting nutrients, and nutrient budgets is important for coastal water management, studies of wide-scale nutrient dynamics in Indonesian waters remain limited. To provide comprehensive data on nutrients, this review summarized the concentrations and compositions of nutrients in coastal waters, compared the limiting nutrients in various coastal waters based on the Redfield ratio, and described the factors affecting nutrient budgets using the database in ScienceDirect and Google Scholar. Curation was performed to summarize the nutrient dynamics in coastal waters. Results showed that nutrient concentration differed in each region due to many factors. Anthropogenic inputs greatly affected nutrients in tropical areas, such as Jakarta Bay (Indonesia). Understanding the quality and characteristics of water can help in managing waterbodies. This study provided knowledge related to nutrient dynamics in Indonesian waters and global biogeochemistry.

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“…In recent years, Chinese researchers improved “phase II” methods in various ways and performed application demonstrations in Bohai Bay [ 30 , 31 ], Yangtze River Estuary [ 32 , 33 ], Beibu Gulf [ 11 ], Jiaozhou Bay [ 21 ], Maowei Sea [ 34 ], Daya Bay [ 35 ], Xiamen Bay [ 36 ], and Taiwan [ 37 ]. Most domestic studies took the arithmetic mean value of monitoring the results from all stations in the study area or the concentration value corresponding to a certain cumulative percentage as the eutrophication indicator eigenvalue.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Assessment of Eutrophication in Xiamen Bay and Its Implications for Management Strategy in Southeast China

Luo

Liu

et al. 2022

IJERPH

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The eutrophication of coastal water has been a critical environmental problem in China’s offshore areas. How to effectively assess the status of coastal waters is key for pollution treatment and environmental protection. In recent years, eutrophication-symptom-based and multi-indicator methods, termed “phase II” methods, have been gradually adopted to assess the eutrophication status in some coastal waters in China and have achieved success. The cumulative quantile is typically selected to determine the characteristic value of an indicator in “phase II” methods. The influence of small-scale damaged water bodies on eutrophication assessment may be exaggerated, which often leads to the overassessment of the eutrophication status. In this study, the area ratio method was integrated into the assessment of the estuarine trophic status (ASSETS) method in order to assess the eutrophication status of Xiamen Bay in 2016. The results indicated that, in 2016, the eutrophication status of Xiamen Bay coastal waters was moderate and exhibited spatiotemporal variation. The area ratio method can effectively reduce the effect of small-scale coastal waters with extremely high eutrophication on the overassessment of eutrophication at the broader scale, allowing the eutrophication status to be better reflected, even with limited observation data. The centralized distribution of pollution sources and poor hydrodynamic conditions are the main reasons for the aforementioned phenomenon. Controlling the pollution discharge from the Jiulong River in flood seasons is key to reducing eutrophication in Xiamen coastal waters.

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Composition and Distributions of Nitrogen and Phosphorus and Assessment of Eutrophication Status in the Maowei Sea

Cited by 17 publications

References 59 publications

C, N, and P Mass Balances in the Bottom Seawater–Surface Sediment Interface in the Reducing Environment due to Anoxic Water of Gamak Bay, Korea

C, N, and P Mass Balances in the Bottom Seawater–Surface Sediment Interface in the Reducing Environment due to Anoxic Water of Gamak Bay, Korea

Deepening Knowledge of Nutrient Dynamics in Coastal Waters

Comprehensive Assessment of Eutrophication in Xiamen Bay and Its Implications for Management Strategy in Southeast China

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