Nutrient characteristics in the Yangtze River Estuary and the adjacent East China Sea before and after impoundment of the Three Gorges Dam

Chai, Chao; Yu, Zhiming; Shen, Zhongrong; Song, Xiuxian; Cao, Xihua; Yao, Yasuhiro

doi:10.1016/j.scitotenv.2009.05.011

Cited by 178 publications

(86 citation statements)

References 32 publications

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“…6). Similar P limitation was also found in the inshore regions of the Changjiang Estuary (Chai et al, 2009), indicating that P limitation may be a common characteristic in river impacted coastal oceans of China. Nutrient acquisition is a major factor determining the outcome of competitive interactions and phytoplankton community composition (i.e., the species that make up the community).…”

Section: Structure Of Nutrients In the Swlzbsupporting

confidence: 67%

Nutrient distribution and structure affect the acidification of eutrophic ocean margins: A case study in southwestern coast of the Laizhou Bay, China

Zhang

Gao

2016

Marine Pollution Bulletin

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The effects of nutrient distribution and structure on the acidity of coastal waters were analyzed based on the data of 48 surface water samples collected in the southwestern coast of the Laizhou Bay and its adjacent rivers (SWLZB) which are heavily influenced by nutrient-laden discharges. The concentration and structure of nutrients varied considerably along the coast owing to different contributors. The studied inshore waters exhibited a sign of acidification. The pH was significantly negatively correlated with the concentration of NO 3 -N, NO 2 -N, NH 4 -N and DSi, but showed no obvious correlation with the concentration of PO 4 -P and the ratio of TDN/TDP, DSi/DIN and DSi/PO 4 -P, respectively. The results indicated that the distribution of nutrients might well be an important environmental factor affecting the acidification of the SWLZB in warmer months.

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Section: Structure Of Nutrients In the Swlzbsupporting

confidence: 67%

Nutrient distribution and structure affect the acidification of eutrophic ocean margins: A case study in southwestern coast of the Laizhou Bay, China

Zhang

Gao

2016

Marine Pollution Bulletin

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“…Both DIN and SRP in the JRE upper reach were also 1-2 times higher than in the Yangtze Estuary. Thus, the N : P ratio in the JRE (100-150) was similar to or slightly higher than the ratio in the Yangtze Estuary (50-150) [40]. In the JRE upper reach, NO 3 -N accounted for 55%-72% of DIN in dry seasons, and 67%-96% in wet seasons (Table 1, Figure 4).…”

Section: Characteristics and Decadal Changes Of Jre Nutrientsmentioning

confidence: 72%

Distribution, fluxes and decadal changes of nutrients in the Jiulong River Estuary, Southwest Taiwan Strait

et al. 2012

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The Jiulong River Estuary (JRE) is a typical subtropical macro-tide estuary on the southwest coast of the Taiwan Strait (TWS), which has been greatly impacted by human activities over the past 30 years. To understand nutrient dynamics and fluxes under such a heavy background of anthropogenic perturbation, eight cruises were conducted from April 2008 to April 2011, covering both wet (May to September) and dry (October to April next year) seasons. Nutrient concentrations were very high for the freshwater end-member in the upper reach of the JRE (nitrate (NO 3 In dry seasons, concentrations of these nutrients were higher than in wet seasons. Nitrate was the dominant chemical species of dissolved inorganic nitrogen (DIN), with percentages of 67%-96% in wet seasons and 55%-72% in dry seasons. Distributions of NO 3 -N and DSi against salinity were nearly constant during all cruises, and showed generally conservative mixing behaviors in the estuary (1

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“…Changing nutrient conditions in the ECS, such as reduced silicate (Gong et al, 2006), limited phosphorus (Chai et al, 2009), and eutrophication (Li and Daler, 2004), are important factors effecting the ecosystem, including primary production (Gong et al, 2006), blooms of the dinoflagellate Prorocentrum spp. Kiyomoto et al, 2013), and the numbers of the giant jellyfish Nemopilema nomurai (Uye, 2008), which preys on fish eggs and larvae and competes with juvenile fishes for micro-and mesozooplankton.…”

Section: Y Umezawa Et Al: Seasonal Shift Of the Nitrate Sources In mentioning

confidence: 99%

Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

et al. 2014

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Abstract. The northern East China Sea (ECS) serves as a spawning and nursery ground for many species of fish and squid. To clarify the basis of the food web in the northern ECS, we examined the nitrate (NO 3 ) dynamics along four latitudinal transects based on stable nitrogen and oxygen isotopes of NO 3 (δ 15 N NO 3 and δ 18 O NO 3 ) and temperaturesalinity dynamics in both winter (February 2009) and summer (July 2009 and July 2011). The δ 15 N NO 3 and δ 18 O NO 3 , which were distinctly different among the potential NO 3 sources, were useful for clarifying NO 3 sources and its actual usage by phytoplankton. In winter, Kuroshio Subsurface Water (KSSW) and the Yellow Sea Mixed Water (YSMW) predominantly contributed to NO 3 distributed in the shelf water. In the surface water of the Okinawa Trough, NO 3 from the KSSW, along with a temperature increase caused by an intrusion of Kuroshio Surface Water (KSW), seemed to stimulate phytoplankton growth. In summer, Changjiang Diluted Water (CDW), Yellow Sea Cold Water Mass (YSCWM), and KSSW affected the distribution and abundance of NO 3 in the northern ECS, depending on precipitation in the Changjiang drainage basin and the development of the YSCWM in the shelf bottom water. Although isotopic fractionation during NO 3 uptake by phytoplankton seemed to drastically increase δ 15 N NO 3 and δ 18 O NO 3 in summer, relatively light nitrate with δ 15 N NO 3 lower than expected from this fractionation effect might be explained by contribution of atmospheric nitrogen and/or nitrification to NO 3 dynamics in the surface and subsurface layers. If the latter were a dominant process, this would imply a tightly coupled nitrogen cycle in the shelf water of the northern ECS.

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Nutrient characteristics in the Yangtze River Estuary and the adjacent East China Sea before and after impoundment of the Three Gorges Dam

Cited by 178 publications

References 32 publications

Nutrient distribution and structure affect the acidification of eutrophic ocean margins: A case study in southwestern coast of the Laizhou Bay, China

Nutrient distribution and structure affect the acidification of eutrophic ocean margins: A case study in southwestern coast of the Laizhou Bay, China

Distribution, fluxes and decadal changes of nutrients in the Jiulong River Estuary, Southwest Taiwan Strait

Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

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