Changes in nitrogen and phosphorus and their effects on phytoplankton in the Bohai Sea

Xu, Shixiao; Song, Jinming; Li, Xuegang; Yuan, Huamao; Li, Ning; Duan, Liqin; Sun, Peiyan

doi:10.1007/s00343-010-0005-3

Cited by 37 publications

(22 citation statements)

References 8 publications

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“…These two distinct patterns of the variations in DIN in the Bohai Sea are not consistent with the aforementioned continuously increasing trend. Evidence has shown that discharge from the Yellow River (Cui et al, ; Li et al, ; Liu et al, ; Xu et al, ; Zhao et al, ) and atmospheric deposition (Cui, ; Liu et al, ; Shou et al, ; Zhang et al, ) are important sources of nutrients in the Bohai Sea, whereas on‐land sewage treatment and chemical fertilizers may be other sources of DIN and PO 4 ‐P (Li et al, ; Liu et al, ; Xu et al, ). As the ratios of different nutrients in the Bohai Sea changed with the variations in nutrient concentrations, it was believed that a gradual change from nitrogen limitation to phosphate and silicate limitations occurred during the early 1980s to the late 1990s (Jiang et al, ; Yu et al, ), and a large variance in the phytoplankton community structure was observed (Liu et al, ; Wu et al, ; Xu et al, ).…”

Section: Introductionsupporting

confidence: 93%

“…This result was supported by the results of the study by Zhang et al () from 1985 to 1998, which showed a decrease before 1990 and an increase after 1990 in the PO 4 ‐P concentration. In addition, the results of the study by Li et al () showed that the DIN concentration in the Bohai Sea decreased from 1982 to 1992 and then increased from 1992 to 2000, whereas the results of the study by Xu et al () based on previous studies found that the DIN concentration increased from 1980 to 1995 and decreased from 1995 to 2005. These two distinct patterns of the variations in DIN in the Bohai Sea are not consistent with the aforementioned continuously increasing trend.…”

Section: Introductionsupporting

confidence: 87%

“…Evidence has shown that discharge from the Yellow River (Cui et al, ; Li et al, ; Liu et al, ; Xu et al, ; Zhao et al, ) and atmospheric deposition (Cui, ; Liu et al, ; Shou et al, ; Zhang et al, ) are important sources of nutrients in the Bohai Sea, whereas on‐land sewage treatment and chemical fertilizers may be other sources of DIN and PO 4 ‐P (Li et al, ; Liu et al, ; Xu et al, ). As the ratios of different nutrients in the Bohai Sea changed with the variations in nutrient concentrations, it was believed that a gradual change from nitrogen limitation to phosphate and silicate limitations occurred during the early 1980s to the late 1990s (Jiang et al, ; Yu et al, ), and a large variance in the phytoplankton community structure was observed (Liu et al, ; Wu et al, ; Xu et al, ). According to the study by Yu et al (), the increased N/P ratio and the decreased Si/N ratio from 1982 to 1999, which are potentially attributed to the increase in fertilizer and decrease in the flow of the Yellow River into the Bohai Sea, may be the major factors driving the occurrence of red tide dinoflagellates (Pyrrophyta) in the Bohai Sea.…”

Section: Introductionmentioning

confidence: 99%

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Long‐Term Nutrient Variations in the Bohai Sea Over the Past 40 Years

Wang

Wei

et al. 2019

JGR Oceans

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As China's only continental sea, the Bohai Sea is a relatively closed environment and is vulnerable to natural changes and human activities. In this paper, the long-term variations in nutrients in the Bohai Sea and the potential influencing factors were analyzed based on historical summer and winter data from 1978 to 2016. The results showed that the concentrations of dissolved inorganic nitrogen (DIN) in the Bohai Sea continuously increased from 1990 and rapidly increased after 2002, the phosphate (PO 4 -P) concentration exhibited a decreasing trend, and the silicate (SiO 3 -Si) concentration decreased from 1978 to 1987 and increased from 1987 to 2008. The nutrient concentrations were lower in summer than in winter, and the bottom concentrations were higher than the surface concentrations in summer, whereas the vertical differences were insignificant in winter. The dominant factor determining the long-term variations in DIN were atmospheric deposition and nonpoint sources due to various human activities; the primary factors affecting PO 4 -P were riverine inputs and nonpoint sources related to natural changes and human activities; the primary factors afftecting SiO 3 -Si were riverine inputs. The N/P ratio followed the DIN variation, the Si/P ratio followed the SiO 3 -Si variation, and the Si/N ratio decreased. The nutrient ratios were lower at the bottom than at the surface and were lower in winter than in summer. The nutrient limitation changed from nitrogen limitation to phosphorus and silicon limitations. The long-term nutrient variations in the Bohai Sea have potential ecological impacts on the local red tide features.Plain Language Summary Nutrients are important to primary productivity and thus important to marine ecosystems. Nutrient variations in coastal oceans may potentially impact the occurrence of ecological disasters. As the only continental sea in China, the Bohai Sea is a relatively closed environment and is vulnerable to natural and anthropogenic impacts. We found that the concentration of dissolved inorganic nitrogen in the Bohai Sea increased from 1990 to 2006; the phosphate concentration decreased from 1978 to 2016, and the silicate concentration decreased before 1987 and increased after 1987. We also found that N/P increased and Si/N decreased. The nutrient concentrations were higher, whereas the nutrient ratios were lower in winter than in summer. In summer, the bottom nutrient concentrations were higher than the surface concentrations, whereas the bottom ratios were lower than the surface ratios; in winter, the vertical differences were insignificant. The primary factors driving the silicate variations were riverine inputs related to natural changes and human activities; the primary factors in the phosphate variations could be riverine inputs and nonpoint sources related to natural changes and human activities; the dominant factor in the dissolved inorganic nitrogen variations could be atmospheric deposition and nonpoint sources due to various human activities. The red tide features in the...

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Section: Introductionsupporting

confidence: 93%

Section: Introductionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Long‐Term Nutrient Variations in the Bohai Sea Over the Past 40 Years

Wang

Wei

et al. 2019

JGR Oceans

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“…Changes in nutrient ratios and limitations caused by anthropogenic activities have become a normal situation in coastal areas in China and around the world. In the Bohai Bay, continuous increase of DIN has resulted in changes of the limiting nutrients from nitrogen in the early 1980s to nitrogen-phosphorus in the late 1980s, and then to phosphorus after the 1990s Xu et al, 2010). In Jiaozhou Bay, concentrations of both nitrogen and phosphorus showed increasing trends in the last four decades; however, the DRSi concentrations appeared an opposite trend during that period.…”

Section: Nutrient Limitations In the Study Areamentioning

confidence: 99%

Temporal and spatial distributions of nutrients under the influence of human activities in Sishili Bay, northern Yellow Sea of China

Wang

Chen

Dong

et al. 2012

Marine Pollution Bulletin

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“…Falkowski (2000) apontou que a razão de Redfield está longe de ser constante e tem sido abraçada por ecologistas aquáticos como informação mais conveniente do que garantida. Segundo Xu et al (2010), a razão de Redfield negligencia o fato de que as concentrações dos nutrientes têm influência no crescimento fitoplanctônico. Desta forma, a razão poderia não suportar alta biomassa fitoplanctônica se as concentrações dos nutrientes forem muito baixas.…”

Section: Tabela 1 -Resumo De Alguns Estudos Mostrando O Local Tipo Dunclassified

Aplicação das concentrações e proporções de nutrientes no diagnóstico da eutrofização

Souza¹,

Pedrosa

Gatts³

et al. 2014

Revista Vértices

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Esta revisão aborda a aplicação das concentrações e proporções de nutrientes (nitrogênio e fósforo) no diagnóstico da eutrofização em águas naturais. Foi realizado um breve histórico sobre a eutrofização e considerações sobre os elementos eutrofizantes. O uso das razões no diagnóstico da eutrofização apresenta limitações, uma vez que existem outros parâmetros que impedem a proliferação do fitoplâncton mesmo em condições ótimas de nutrientes. Os bioensaios são utilizados para identificar a limitação de nutrientes ao crescimento fitoplanctônico, enquanto o índice de estado trófico é utilizado para avaliar o estado de enriquecimento nutricional de um ecossistema aquático. Este trabalho destaca a importância do estudo de diagnóstico da eutrofização nas águas naturais submetidas aos impactos decorrentes da ação humana e sugere ações para melhoria de suas condições, como a proteção de matas ciliares, terraceamento de áreas agrícolas, a utilização da quantidade necessária de fertilizantes e o tratamento dos efluentes oriundos dos esgotos para reduzir as cargas de N e P para os ambientes lóticos.

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Changes in nitrogen and phosphorus and their effects on phytoplankton in the Bohai Sea

Cited by 37 publications

References 8 publications

Long‐Term Nutrient Variations in the Bohai Sea Over the Past 40 Years

Long‐Term Nutrient Variations in the Bohai Sea Over the Past 40 Years

Temporal and spatial distributions of nutrients under the influence of human activities in Sishili Bay, northern Yellow Sea of China

Aplicação das concentrações e proporções de nutrientes no diagnóstico da eutrofização

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