Seasonal Variation and Sources of Dissolved Nutrients in the Yellow River, China.
Int J Environ Res Public Health
; 12(8): 9603-22, 2015 Aug 14.
Article
em En
| MEDLINE
| ID: mdl-26287226
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.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfatos
/
Fósforo
/
Silicatos
/
Rios
/
Nitratos
/
Nitrogênio
País/Região como assunto:
Asia
Idioma:
En
Revista:
Int J Environ Res Public Health
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
China