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Seasonal Variation and Sources of Dissolved Nutrients in the Yellow River, China.

Gong Y, Yu Z, Yao Q, Chen H, Mi T, Tan J - Int J Environ Res Public Health (2015)

Bottom Line: Nutrient concentrations exhibited substantial seasonal and yearly variations.The relative contributions of nutrient inputs to nitrogen in the YR were: wastewater > fertilizer > atmospheric deposition > soil; while to phosphorus were: wastewater > fertilizer > soil > atmospheric deposition.The ratios of N, P and Si suggest that the YR at Lijin is strongly P-limited with respect to potential phytoplankton growth.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266100, China. gongyaohh@163.com.

ABSTRACT
The rapid growth of the economy in China has caused dramatic growth in the industrial and agricultural development in the Yellow River (YR) watershed. The hydrology of the YR has changed dramatically due to the climate changes and water management practices, which have resulted in a great variation in the fluxes of riverine nutrients carried by the YR. To study these changes dissolved nutrients in the YR were measured monthly at Lijin station in the downstream region of the YR from 2002 to 2004. This study provides detailed information on the nutrient status for the relevant studies in the lower YR and the Bohai Sea. The YR was enriched in nitrate (average 314 μmol·L(-1)) with a lower concentration of dissolved silicate (average 131 μmol·L(-1)) and relatively low dissolved phosphate (average 0.35 μmol·L(-1)). Nutrient concentrations exhibited substantial seasonal and yearly variations. The annual fluxes of dissolved inorganic nitrogen, phosphate, and silicate in 2004 were 5.3, 2.5, and 4.2 times those in 2002, respectively, primarily due to the increase in river discharge. The relative contributions of nutrient inputs to nitrogen in the YR were: wastewater > fertilizer > atmospheric deposition > soil; while to phosphorus were: wastewater > fertilizer > soil > atmospheric deposition. The ratios of N, P and Si suggest that the YR at Lijin is strongly P-limited with respect to potential phytoplankton growth.

No MeSH data available.


Water discharge, sediment and concentrations of nutrients at Lijin Station from 2002 to 2004.
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ijerph-12-09603-f002: Water discharge, sediment and concentrations of nutrients at Lijin Station from 2002 to 2004.

Mentions: Discharge in the YR in the period 2002–2004 varied substantially, with similar large variations of the suspended sediment load from 0.7 kg·m−3 to 34.2 kg·m−3. Discharge and suspended sediment load are strongly correlated (R2 = 0.69, n = 35), especially in summer (from June to August, Figure 2). Maximum discharge and suspended sediment load occurred in July 2002, October 2003, and August 2004, respectively. And the maximum discharge and suspended sediment load were more than 78 and 94 times of the minimum discharge and suspended sediment load, respectively. Summer discharge accounted for more than 70% of the total annual discharge. The annual discharge was 4.19 × 109 m3/a, 1.926 × 1010 m3/a, and 1.988 × 1010 m3/a in 2002, 2003, and 2004, respectively [22], and the average value from 1956 to 2000 was 3.154 × 1010 m3/a [22].


Seasonal Variation and Sources of Dissolved Nutrients in the Yellow River, China.

Gong Y, Yu Z, Yao Q, Chen H, Mi T, Tan J - Int J Environ Res Public Health (2015)

Water discharge, sediment and concentrations of nutrients at Lijin Station from 2002 to 2004.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555301&req=5

ijerph-12-09603-f002: Water discharge, sediment and concentrations of nutrients at Lijin Station from 2002 to 2004.
Mentions: Discharge in the YR in the period 2002–2004 varied substantially, with similar large variations of the suspended sediment load from 0.7 kg·m−3 to 34.2 kg·m−3. Discharge and suspended sediment load are strongly correlated (R2 = 0.69, n = 35), especially in summer (from June to August, Figure 2). Maximum discharge and suspended sediment load occurred in July 2002, October 2003, and August 2004, respectively. And the maximum discharge and suspended sediment load were more than 78 and 94 times of the minimum discharge and suspended sediment load, respectively. Summer discharge accounted for more than 70% of the total annual discharge. The annual discharge was 4.19 × 109 m3/a, 1.926 × 1010 m3/a, and 1.988 × 1010 m3/a in 2002, 2003, and 2004, respectively [22], and the average value from 1956 to 2000 was 3.154 × 1010 m3/a [22].

Bottom Line: Nutrient concentrations exhibited substantial seasonal and yearly variations.The relative contributions of nutrient inputs to nitrogen in the YR were: wastewater > fertilizer > atmospheric deposition > soil; while to phosphorus were: wastewater > fertilizer > soil > atmospheric deposition.The ratios of N, P and Si suggest that the YR at Lijin is strongly P-limited with respect to potential phytoplankton growth.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266100, China. gongyaohh@163.com.

ABSTRACT
The rapid growth of the economy in China has caused dramatic growth in the industrial and agricultural development in the Yellow River (YR) watershed. The hydrology of the YR has changed dramatically due to the climate changes and water management practices, which have resulted in a great variation in the fluxes of riverine nutrients carried by the YR. To study these changes dissolved nutrients in the YR were measured monthly at Lijin station in the downstream region of the YR from 2002 to 2004. This study provides detailed information on the nutrient status for the relevant studies in the lower YR and the Bohai Sea. The YR was enriched in nitrate (average 314 μmol·L(-1)) with a lower concentration of dissolved silicate (average 131 μmol·L(-1)) and relatively low dissolved phosphate (average 0.35 μmol·L(-1)). Nutrient concentrations exhibited substantial seasonal and yearly variations. The annual fluxes of dissolved inorganic nitrogen, phosphate, and silicate in 2004 were 5.3, 2.5, and 4.2 times those in 2002, respectively, primarily due to the increase in river discharge. The relative contributions of nutrient inputs to nitrogen in the YR were: wastewater > fertilizer > atmospheric deposition > soil; while to phosphorus were: wastewater > fertilizer > soil > atmospheric deposition. The ratios of N, P and Si suggest that the YR at Lijin is strongly P-limited with respect to potential phytoplankton growth.

No MeSH data available.