Long-term changes in nutrient concentrations of the Changjiang River and principal tributaries

Duan, Shuiwang; Xu, Feng; Wang, Lijun

doi:10.1007/s10533-007-9130-2

Cited by 77 publications

(61 citation statements)

References 35 publications

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“…These facts indicate mineral fertilizers, which are increasingly used in farming as KNO 3 salt, as the origin of the high NO 3 − and K + loads. This is in agreement with the assessments of Yan et al (2003) and Duan et al (2007). The river is supplied by groundwater during low-flow period in the middle and lower basin, where nitrate levels are higher than in the upper basin.…”

Section: Nutrients: N and Psupporting

confidence: 92%

“…Duan et al (2007) Today, we observed DIP concentrations on a much lower and constant concentration of 6-8 µgP/L compared to 10-25 µgP/L reported by Zhang et al (1999) a decade ago. However, contrary to the prior observations, NO 3 − concentrations steadily increased downstream of the TGD (Fig.…”

Section: Nutrients: N and Pmentioning

confidence: 53%

“…Rather alarming are the increasing amounts (compared with measurements compiled by Zhang, 1995) of almost all parameters quantified. An analysis of the wealth of monitoring data collected since 1956 such as undertaken by Duan et al (2007) and Yan et al (2003) will help to allocate trends, depict local developments, introduce concerted measures, and control their success. The effect of dilution is to forestall the deterioration of the river's water quality.…”

Section: Discussionmentioning

confidence: 99%

“…Yan et al (2003) and Duan et al (2007) use data from monitoring stations to document the development of N loads since 1958 and show that NO 3 − concentrations and fluxes increased about tenfold from 1968 to 1997. Zhang et al (1999) and Liu S. et al (2003b) published an extensive survey of concentration levels of nutrients in the Yangtze and 15 of its major tributaries on a stretch of almost 3700 km upstream from the river mouth in Shanghai.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

How polluted is the Yangtze river? Water quality downstream from the Three Gorges Dam

Müller

Berg

Yao

et al. 2008

Science of The Total Environment

281

132

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Section: Nutrients: N and Psupporting

confidence: 92%

Section: Nutrients: N and Pmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

How polluted is the Yangtze river? Water quality downstream from the Three Gorges Dam

Müller

Berg

Yao

et al. 2008

Science of The Total Environment

281

132

View full text Add to dashboard Cite

“…It is reported that the levels of nitrate throughout the Yangtze River system remained fairly constant before 1970s (Duan et al 2007). Recent results, however, showed that at the mouth of the Yangtze River the nitrate concentration has increased about three-fold in 40 years, from 1.3 mg l -1 in the 1960s to 3.7 mg l -1 in the 1980s and to 5.0 mg l -1 in 1990-2004.…”

Section: Nutrient Enrichment In China's Surface Watersmentioning

confidence: 99%

Eutrophication in a Chinese Context: Understanding Various Physical and Socio-Economic Aspects

Gao

Zhang

2010

AMBIO

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Eutrophication is now a ubiquitous water quality impairment in China. The first step toward restoration of eutrophicated water bodies is a marked reduction of nutrient loadings in their drainage basins. However, the combination of a number of physical and socio-economic factors is now producing compounded increases in nutrient loads while the nutrient assimilation capacities of natural systems are decreasing. Meanwhile, most of the lakes in densely populated part of China are shallow and very susceptible to anthropogenic alteration. Therefore, in spite of ascending efforts in eutrophication control upward trends of algal blooms in both fresh and coastal waters have been observed for the past two decades. Huge knowledge gap exists in our understanding of the sources and pathways of nutrient losses to aquatic ecosystems. Successful water quality restoration of China's eutrophic waters relies not only on more resource input but also more emphasis on basic, integrated, and management-oriented research.

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Cross‐shelf exchange in the shelf of the East China Sea

et al. 2015

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A high-resolution, 3-dimensional primitive equation model is used to investigate the crossshelf exchange in the East China Sea (ECS). Favorable comparisons between field data and model simulations from both climatological run and hindcast run for 2006 indicate that the model has essential skills in capturing the key physics of the ECS. Temporal and spatial variations of the cross-shelf exchanges are further analyzed. It was demonstrated from both observations and simulations that in 2006 high saline water could be delivered to the north of the Changjiang River mouth (near 32 N) as a result of stronger than typical cross-shelf exchanges at the shelf break and flows through the Taiwan Strait with an annual mean rate of 2.59 and 1.83 Sv, respectively. A few new places at the shelf break were also identified where persistent and vigorous onshore or offshore exchanges occur throughout the year. Cross-shelf exchange is largely determined by the along-shelf geostrophic balance with weak seasonality, which is modulated in upper layers by northeasterly monsoon from early-fall to late-spring and at seabed by bottom friction during December-January, May, and August-September. Nonlinear effect, with strong spatial variations and intraseasonal variability, is a secondary but persistent contributor to the net seaward transport, except for northeast of Taiwan where the nonlinear effect becomes significant but more varied.

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Long-term changes in nutrient concentrations of the Changjiang River and principal tributaries

Abstract: We present long-term nutrient data on the Changjiang River (Yangtze River) at six hydrological stations and eight principal tributaries during the period . Three patterns of temporal changes were observed in nitrateðNO

Cited by 77 publications

References 35 publications

How polluted is the Yangtze river? Water quality downstream from the Three Gorges Dam

How polluted is the Yangtze river? Water quality downstream from the Three Gorges Dam

Eutrophication in a Chinese Context: Understanding Various Physical and Socio-Economic Aspects

Cross‐shelf exchange in the shelf of the East China Sea

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