Cultural eutrophication in the Changjiang (Yangtze River) plume: History and perspective

Wang, Baodong

doi:10.1016/j.ecss.2006.05.010

Cited by 248 publications

(147 citation statements)

References 19 publications

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“…On the other hand, an inverse expression of APA Chl and phosphate concentrations is expected (Perry, 1972;Dyhrman and Ruttenberg;2006). In our study, however, such negative correlation is basically observed in turbidity-influenced samples (Fig.…”

Section: Applicability Of P-deficient Indicators In Cj Plumecontrasting

confidence: 52%

“…The Changjiang (CJ) River holds large water discharge (annual mean ∼ 924 km 3 yr −1 ) and high nutrient concentrations, serving as the major nutrient source to the ECS (Zhang et al, 2007). Since the 1950s, rapidly growing anthropogenic activities, such as fertilizer applications, have caused ∼ 8 × increase in N concentration and fluxes in the CJ River (Wang, 2006). In addition, the CJ River was recorded to be a high N / P ratio system and "excess N" was found in the surface water covering more than one-third of the ECS in summer (Wong et al, 1998).…”

Section: Y-f Tseng Et Al: Phosphorus Stress Of Coastal Phytoplanktonmentioning

confidence: 99%

“…The enhanced nutrient concentrations caused by increasing anthropogenic activities had stimulated red tide outbreaks around the plume front (Chai et al, 2006;Wang, 2006;Zhou et al, 2008) where both light and nutrient were sufficient for algae growth. At stations Y9 and Y9a, TSM concentrations decreased dramatically (Fig.…”

Section: Joint Effect Of Cdw and Coastal Upwelling On Phytoplankton Pmentioning

confidence: 99%

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Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River

Tseng¹,

Lin

Dai

et al. 2014

Biogeosciences

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Section: Applicability Of P-deficient Indicators In Cj Plumecontrasting

confidence: 52%

Section: Y-f Tseng Et Al: Phosphorus Stress Of Coastal Phytoplanktonmentioning

confidence: 99%

Section: Joint Effect Of Cdw and Coastal Upwelling On Phytoplankton Pmentioning

confidence: 99%

See 1 more Smart Citation

Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River

Tseng¹,

Lin

Dai

et al. 2014

Biogeosciences

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“…Shiozaki et al (2010) also estimated that the mean bulk water N 2 fixation by pico-, nano-, and microplanktonic diazotrophs was 232 ± 54.8 µmol N m −2 day −1 in Kuroshio and ECS areas based on a 15 N 2 -tracer method. Relatively higher N * values in the water column on the continental shelf rather than that in deep water at the Okinawa Trough also corresponded with the contribution of N 2 fixation (Tables 1-3), although N * may be also enhanced due to river-derived nutrients having higher N / P ratios (Wang et al, 2006). In addition, subtle increase of [NO 3 ] with relatively lower salinity of the surface water in the Philippine Sea next to the ECS was reported to be attributed to rainwaterderived NO 3 , and total amounts of DIN supplied through the atmospheric dry deposition to ECS was estimated to be comparable to the N supplied by biological N 2 fixation (Yamada et al, 2013).…”

Section: Contributions Of Nitrification and Atmospheric Nitrogen To Nmentioning

confidence: 96%

“…Nitrate is the predominant DIN (dissolved inorganic nitrogen) species in the ECS, and new nitrogen is supplied by many rivers (Wong et al, 1998;Wang, 2006;Siswanto et al, 2008a;Liu et al, 2010b), intrusions from surrounding oceans (see below), bottom water (Hung and Gong, 2011;Shiozaki et al, 2011) and occasional deposition from the atmosphere (Nakamura et al, 2005(Nakamura et al, , 2006Kodama et al, 2011). The water on the continental shelf in the northern ECS is a mixture of Changjiang Diluted Water (CDW), Kuroshio Surface Water (KSW), Kuroshio Subsurface Water (KSSW), Yellow Sea Cold Water Mass (YSCWM), and Taiwan Warm Current Water (TWCW) (e.g., Ichikawa and Beardsley, 2002;Liu et al, 2010b).…”

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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Net anthropogenic nitrogen inputs (NANI) into the Yangtze River basin and the relationship with riverine nitrogen export

et al. 2016

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This study investigated net anthropogenic nitrogen inputs (NANI, including atmospheric nitrogen deposition, nitrogenous fertilizer use, net nitrogen import in food and feed, and agricultural nitrogen fixation) and the associated relationship with riverine dissolved inorganic nitrogen (DIN) export in the Yangtze River basin during the 1980–2012 period. The total NANI in the Yangtze River basin has increased by more than twofold over the past three decades (3537.0 ± 615.3 to 8176.6 ± 1442.1 kg N km−2 yr−1). The application of chemical fertilizer was the largest component of NANI in the basin (51.1%), followed by net nitrogen import in food and feed (26.0%), atmospheric nitrogen deposition (13.2%), and agricultural nitrogen fixation (9.7%). A regression analysis showed that the riverine DIN export was strongly correlated with NANI and the annual water discharge (R2 = 0.90, p < 0.01). NANI in the Yangtze River basin was estimated to contribute 37–66% to the riverine DIN export. We also forecasted future variations in NANI and riverine DIN export for the years 2013 to 2030, based on possible future changes in human activities and the climate. This work provides a quantitative understanding of NANI in the Yangtze River basin and its effects on riverine DIN export and helps to develop integrated watershed nitrogen management strategies.

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Cultural eutrophication in the Changjiang (Yangtze River) plume: History and perspective

Cited by 248 publications

References 19 publications

Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River

Joint effect of freshwater plume and coastal upwelling on phytoplankton growth off the Changjiang River

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

Net anthropogenic nitrogen inputs (NANI) into the Yangtze River basin and the relationship with riverine nitrogen export

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