Impacts of human activities on nutrient transports in the Huanghe (Yellow River) estuary

Liu, Su Mei; Li, Ling Wei; Zhang, Gui Ling; Liu, Zhe; Yu, Zhigang; Ren, J. R.

doi:10.1016/j.jhydrol.2012.02.005

Cited by 152 publications

(60 citation statements)

References 18 publications

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“…The average concentration of reactive phosphorus in the five sampling transects was relatively low, and such results were similar to the results of the survey conducted in the inshore waters in the Yellow River Estuary by Liu et al (2012), indicating nutrients in the inshore areas of the Laizhou Bay had high nitrogen concentration and low phosphorus concentration. The K-transect had the highest PO 4 -P concentration which further indicated that nutrients in that area were heavily influenced by human activities.…”

Section: −1supporting

confidence: 84%

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: −1supporting

confidence: 84%

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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“…This value of 760:1 was similar in magnitude to the values we obtained from the three stations sampled in the lower reaches in 2011 (720−1510) and to previous measurements in the river (167−368). 4,5,22,37 These ratios are very much higher than those determined for other major rivers globally, which are generally between 10 and 100. 5,28 They are also much higher than the molar N:P ratios in typical sewage, industrial, or atmospheric inputs to Yellow River.…”

Section: ■ Materials and Methodsmentioning

confidence: 76%

“…The Yellow River is impacted by considerable nutrient pollution (both N and P). 22,35 Previous studies have used the increase in fluxes of nitrate as a measure of the degree of nutrient pollution in this and other river catchments. 36 Using nitrate and ammonium data collected from a similar transect down the river in 1989− 2000, 36 compared with the phosphate values obtained in this study collected during 2007, a nitrate/phosphate molar ratio of 760:1 was calculated.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Impact of Suspended Inorganic Particles on Phosphorus Cycling in the Yellow River (China)

Pan

Krom

Zhang

et al. 2013

Environ. Sci. Technol.

109

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Phosphorus (P) in water and sediment in the Yellow River was measured for 21 stations from the source to the Bohai Sea in 2006−2007. The average total particulate matter (TPM) increased from 40 mg/L (upper reaches) to 520 mg/L (middle reaches) and 950 mg/L in the lower reaches of the river. The average dissolved PO 4 concentration (0.43 μmol/L) was significantly higher than that in 1980's but lower than the world average level despite high nutrient input to the system. Much of the P input was removed by adsorption, which was due to the high TPM rather than the surface activity of the particles since they had low labile Fe and low affinity for P. The sediment was a sink for P in the middle to lower reaches but not in the upper to middle reaches. TPM has been reduced by more than an order of magnitude due to artificial dams operating over recent decades. Modeling revealed that TPM of 0.2−1 g/L was a critical threshold for the Yellow River, below which most of the phosphate input cannot be removed by the particles and may cause eutrophication. These findings are important for river management and land−ocean modeling of global biogeochemical P cycling.

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“…China is a country with a rapid economic development and a fast growing population [13][14][15][16][17][18][19]. For example, the number of cities in China more than quadrupled and the urban population increased by over 20 times between the 1950s and 2008 [17].…”

Section: Introductionmentioning

confidence: 99%

Modelling nitrogen and phosphorus export by the Pearl River in China 1970–2050

Strokal

Kroeze

et al. 2014

WIT Transactions on Ecology and the Environment

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China is a country with a rapid economic development and fast population growth. This is causing environmental pollution. Eutrophication has been a problem in the coastal waters of southern China since the 1970s. This is a result of increased nitrogen (N) and phosphorus (P) inputs from rivers such as the Pearl River (Zhujiang). The Pearl River is the third largest river in China. It serves as an important water supplier for irrigation and human water consumption. Human activities on land, however, have increased the nutrient content of the Pearl River water considerably. The objective of our study is to quantify the relative contribution of the anthropogenic and non-anthropogenic sources of dissolved inorganic N and P export by the Pearl River to coastal seas. We describe a method to model dissolved N and P export at the sub-basin scale. Results indicate that in 2000 about 90% of the dissolved N and P inputs exported by the Pearl River to the coastal waters were from anthropogenic sources (e.g. agriculture, sewage, and biological N 2 -fixation by agricultural crops). In the future the relative share of anthropogenic sources may increase. We show that nutrient inputs from land to rivers vary among sub-basins. We conclude that modelling and scenario analyses may support the formulation of effective strategies to reduce N and P export by the Pearl River, and thus to effective management of coastal eutrophication in the coming decades.

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Impacts of human activities on nutrient transports in the Huanghe (Yellow River) estuary

Cited by 152 publications

References 18 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

Impact of Suspended Inorganic Particles on Phosphorus Cycling in the Yellow River (China)

Modelling nitrogen and phosphorus export by the Pearl River in China 1970–2050

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