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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.


Location of the Yellow River Basin and sampling station.
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ijerph-12-09603-f001: Location of the Yellow River Basin and sampling station.

Mentions: The YR is, after the Yangtze River, the second largest river in China in terms of both length and basin area (Figure 1). The YR is approximately 5500 km long, originating in the northern part of the Bayankala Mountains of the Qinghai-Tibet Plateau at an altitude of 4830 m. Within the YR there are 168 large and mid-size reservoirs [22], which were located on the Yellow River and its tributaries in order to store water and regulate the river’s discharge and sediment. The YR drainage basin covers an area of 7.95 × 105 km2, of which 1.19 × 105 km2 or approximately 15% of total land area is farmland [23]. The farmland includes the arable lands, with wheat planted in the winter and the spring and corn planted in the summer and the autumn. The fertilizer used in the Yellow River basin had been listed in Table 1. The population of the YR basin is more than 107 M, which accounts for about 8.7% of the population of China [23]. The climate of the YR basin is arid, semi-arid to semi-humid with 80% of the annual precipitation falling in June–August each year [24]. The average basin-wide wet deposition was (basin-wide precipitation volume in parentheses) 404 mm (3.21 × 1011 m3) in 2002, 556 mm (4.4 × 1011 m3 ) in 2003, and 422 mm (3.4 × 1011 m3) in 2004, respectively [21].


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)

Location of the Yellow River Basin and sampling station.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-09603-f001: Location of the Yellow River Basin and sampling station.
Mentions: The YR is, after the Yangtze River, the second largest river in China in terms of both length and basin area (Figure 1). The YR is approximately 5500 km long, originating in the northern part of the Bayankala Mountains of the Qinghai-Tibet Plateau at an altitude of 4830 m. Within the YR there are 168 large and mid-size reservoirs [22], which were located on the Yellow River and its tributaries in order to store water and regulate the river’s discharge and sediment. The YR drainage basin covers an area of 7.95 × 105 km2, of which 1.19 × 105 km2 or approximately 15% of total land area is farmland [23]. The farmland includes the arable lands, with wheat planted in the winter and the spring and corn planted in the summer and the autumn. The fertilizer used in the Yellow River basin had been listed in Table 1. The population of the YR basin is more than 107 M, which accounts for about 8.7% of the population of China [23]. The climate of the YR basin is arid, semi-arid to semi-humid with 80% of the annual precipitation falling in June–August each year [24]. The average basin-wide wet deposition was (basin-wide precipitation volume in parentheses) 404 mm (3.21 × 1011 m3) in 2002, 556 mm (4.4 × 1011 m3 ) in 2003, and 422 mm (3.4 × 1011 m3) in 2004, respectively [21].

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.