Effect of wind events on phytoplankton blooms in the Pearl River estuary during summer

Yin, Kedong; Zhang, Jianlin; Qian, Pei‐Yuan; Jian, Weijun; Huang, Liangmin; Chen, Jianfang; Wu, Madeline

doi:10.1016/j.csr.2004.06.015

Cited by 106 publications

(53 citation statements)

References 37 publications

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“…Although there are very few biological studies conducted in the upper section of the estuary in either the dry or wet seasons, and hence there is a need for further research in this region of the river, high turbidity inhibits biological production and uptake of nutrients. For example, in July 1999, the phytoplankton productivity in the freshwater-dominated estuary was only <2% of that at the edge of the estuarine coastal plume south of Hong Kong possibly due to light limitation as a result of dilution/mixing and turbidity Yin et al, 2004). In high salinity regions, nutrients may become depleted in the surface waters due to consumption by biological uptake and enrichment by decomposition of organic material in deep waters .…”

Section: Nutrients In the Chinese Estuariesmentioning

confidence: 99%

“…Potential consequences on nutrient budgets are estimated in case wastewater data are available. For the Zhujiang estuary, the water quality has been extensively examined, indicating that the estuary exhibits some symptoms of eutrophication and low dissolved oxygen due to anthropogenic activities, such as increased agricultural activities and sewage effluents (Dai et al, 2006;Huang et al, 2003;Yin et al, 2004). Model output indicated that in the Zhujiang estuary, the proportion of waste load to riverine flux was 0.1% in July 1999 and 1.0% in January 1999 for nitrate plus nitrite, 28.2% in July 1999 and 178% in January 1999 for ammonium, and 9.9% in July 1999 and 63.9% in January 1999 for phosphate (Hu and Li, 2009).…”

Section: Water and Nutrient Budgets In Estuaries 621 Estuarine Nutrmentioning

confidence: 99%

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Nutrient budgets for large Chinese estuaries

et al. 2009

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Abstract.Chinese rivers deliver about 5-10% of global freshwater input and 15-20% of the global continental sediment to the world ocean. We report the riverine fluxes and concentrations of major nutrients (nitrogen, phosphorus, and silicon) in the rivers of the contiguous landmass of China and Korea in the northeast Asia. The rivers are generally enriched with dissolved inorganic nitrogen (DIN) and depleted in dissolved inorganic phosphate (PO 3− 4 ) with very high DIN: PO 3− 4 concentration ratios. DIN, phosphorus, and silicon levels and loads in rivers are mainly affected by agriculture activities and urbanization, anthropogenic activities and adsorption on particulates, and rock types, climate and physical denudation intensity, respectively. Nutrient transports by rivers in the summer are 3-4 times higher than those in the winter with the exception of NH + 4 . The flux of NH + 4 is rather constant throughout the year due to the anthropogenic sources such as the sewer discharge. As nutrient composition has changed in the rivers, ecosystems in estuaries and coastal sea have also changed in recent decades. Among the changes, a shift of limiting nutrients from phosphorus to nitrogen for phytoplankton production with urbanization is noticeable and in some areas silicon becomes the limiting nutrient for diatom productivity. A simple steady-state massbalance box model was employed to assess nutrient budgets in the estuaries. The major Chinese estuaries export <15% of nitrogen, <6% of phosphorus required for phytoplankton production and ∼4% of silicon required for diatom growth in the Chinese Seas (Bohai, Yellow Sea, East China Sea, South China Sea). This suggests that land-derived nutrients areCorrespondence to: S. M. Liu (sumeiliu@ouc.edu.cn) largely confined to the immediate estuaries, and ecosystem in the coastal sea beyond the estuaries is mainly supported by other nutrient sources such as regeneration, open ocean and atmospheric deposition.

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Section: Nutrients In the Chinese Estuariesmentioning

confidence: 99%

Section: Water and Nutrient Budgets In Estuaries 621 Estuarine Nutrmentioning

confidence: 99%

Nutrient budgets for large Chinese estuaries

et al. 2009

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“…In general, spatial and temporal variability in phytoplankton blooms is largely controlled by various physical and chemical factors such as nutrients, temperature, current speed and rainfall (Phlips et al 2002;Song et al 2004;Yin et al 2004;Calliari et al 2005;Domingues et al 2005;Ramdani et al 2009) with most factors being inter-related (Boyd 2002;Venables et al 2007). Nutrient availability has frequently outweighed other factors and has been a major controlling factor to influence successions of phytoplankton species abundance (Roelke et al 1999;Turley 1999;Liu et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton variation and its relationship with the environment in Xiangxi Bay in spring after damming of the Three-Gorges, China

Zhou

Zhao

et al. 2010

Environ Monit Assess

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Following the completion of the ThreeGorges Dam, there was a strong spring phytoplankton bloom in Xiangxi Bay of Three-Gorges Reservoir. However, our knowledge of relationship between spring phytoplankton bloom and environmental factors was still limited. In this study, phytoplankton species composition, biomass, chlorophyll a concentration and environmental factors at two sampling sites in Xiangxi Bay were investigated during 25 March to 18 May 2007. The Xiangxi Bay was eutrophic with the lowest values of total nitrogen and total phosphorus being 0.80 and 0.07 mg/L, respectively. A total of 66 algal taxa belonging to seven phyla and 45 genera were identified. Peridiniopsis niei Liu was the most abundant species which preferred standing water. Canonical correspondence analysis and correlation analysis revealed that nitrate was significantly associated with phytoplankton growth. The phytoplankton chlorophyll a concentration was correlated significantly negatively with nitrate concentration, and nitrate concentration was very low during bloom periods. Heavy rainfall was the main reason of phytoplankton chlorophyll a concentration and biomass decreasing and blooms disappearing. In addition, heavy rainfall also brought more nitrate into the Bay which provided sufficient nitrogen source for blooms occurring again.

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“…This monosaccharide may have been derived from the mixture of phytoplankton, bacteria and/or terrestrial plant sources, based on the fact that GAL was elevated in the inner shelf (stations S7-1 and S6A-1, Fig. 5), where primary productivity was much higher (3000-4300 mg C m −2 d −1 ) as compared to in the Pearl River Estuary (<100 mg C m −2 d −1 ) (Yin et al, 2004). It is thus suggested that phytoplankton should be the main source of GAL in this area.…”

Section: Source Characterization Of Carbohydrates In the Pearl River mentioning

confidence: 99%

Sources and accumulation of organic carbon in the Pearl River Estuary surface sediment as indicated by elemental, stable carbon isotopic, and carbohydrate compositions

Dai

Huang

et al. 2010

Biogeosciences

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Abstract. Organic matter in surface sediments from the upper reach of the Pearl River Estuary and Lingdingyang Bay, as well as the adjacent northern South China Sea shelf was characterized using a variety of techniques, including elemental (C and N) ratio, bulk stable organic carbon isotopic composition (δ 13 C), and carbohydrate composition analyses. Total organic carbon (TOC) content was 1.21 ± 0.45% in the upper reach, down to 1.00±0.22% in Lingdingyang Bay and to 0.80 ± 0.10% on the inner shelf and 0.58 ± 0.06% on the outer shelf. δ 13 C values ranged from −25.1‰ to −21.3‰ in Lingdingyang Bay and the South China Sea shelf, with a trend of enrichment seawards. The spatial trend in C/N ratios mirrored that of δ 13 C, with a substantial decrease in C/N ratio offshore. Total carbohydrate yields ranged from 22.1 to 26.7 mg (100 mg OC) −1 , and typically followed TOC concentrations in the estuarine and shelf sediments. Total neutral sugars, as detected by the nine major monosaccharides (lyxose, rhamnose, ribose, arabinose, fucose, xylose, galactose, mannose, and glucose), were between 4.0 and 18.6 mg (100 mg OC) −1 in the same sediments, suggesting that significant amounts of carbohydrates were not neutral aldoses. Using a two end-member mixing model based on δ 13 C values and C/N ratios, we estimated that the terrestrial organic carbon contribution to the surface sediment TOC was ca. 78±11% for Lingdingyang Bay, 34±4% for the inner shelf, and 5.5 ± 1% for the outer shelf. The molecular composition of the carbohydrate in the surface sediments also suggested that the inner estuary was rich in terrestrially derived carbohydrates but that their contribution decreased offshore. A relatively high abundance of deoxyhexoses in the estuary and Correspondence to: M. Dai (mdai@xmu.edu.cn) shelf indicated a considerable bacterial source of these carbohydrates, implying that sediment organic matter had undergone extensive degradation and/or transformation during transport. Sediment budget based on calculated regional accumulation rates showed that only ∼50% of the influxes of terrestrial organic carbon were accumulated in the estuary. This relatively low accumulation efficiency of terrestrial organic matter as compared to the total suspended solids (accumulation efficiency ∼73%) suggested significant degradation of the terrestrial organic carbon within the estuarine system after its discharge from the river. This study demonstrated that the combination of the bulk organic matter properties together with the isotopic composition and molecular-level carbohydrate compositions can be an efficient way to track down the source and fate of organic matter in highly dynamic estuarine and coastal systems. The predominance of terrestrially originated organic matter in the sediment and its generally low accumulation efficiency within the estuary is not surprising, and yet it may have important implications in light of the heavy anthropogenic discharges into the Pearl River Estuary during the past thirty years.

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Effect of wind events on phytoplankton blooms in the Pearl River estuary during summer

Cited by 106 publications

References 37 publications

Nutrient budgets for large Chinese estuaries

Nutrient budgets for large Chinese estuaries

Phytoplankton variation and its relationship with the environment in Xiangxi Bay in spring after damming of the Three-Gorges, China

Sources and accumulation of organic carbon in the Pearl River Estuary surface sediment as indicated by elemental, stable carbon isotopic, and carbohydrate compositions

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