title: [Effect of the first water-sediment regulation on the variations of dissolved inorganic nutrients' concentrations and fluxes in the lower main channel of the Yellow River].
abstract: The variations and fluxes of dissolved inorganic nutrients were studied, based on continuously monitored data in the lower main channel of Yellow River (Lijin) during the period of water-sediment regulation in July 2002. Concentrations rang from 169.3 to 273.2 micromol x dm(-3) for NO3- -N, 0.08 to 0.84 micromol x dm(-3) for NO2- -N, 1.39 to 5.04 micromol x dm(-3) for NH4+ -N, with average of 218.6, 0.16, 2.27 micromol x dm(-3), respectively. Concentrations rang from 0.36 to 0.56 micromol x dm(-3) for PO4(3-) -P, 161.4 to 195.8 micromol x dm(-3) for SiO3(2-) -Si, with average of 0.48, 166.7 micromol x dm(-3), respectively. No significant relationship was found between nitrate, phosphate and water discharge during the period of water-sediment regulation, while silicate correlated well with suspended sediment discharge. Water-sediment regulation has no significant effect on the variation of dissolved inorganic nutrients concentrations during 2002 to 2003. But the fluxes proportion of dissolved inorganic nutrients during water-sediment regulation to the whole year is about 50%.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China. qzhyao@ouc.edu.cn
authors.forename: Qing-zheng
authors.initials: QZ
authors.lastname: Yao
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Yu
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.forename: Hong-tao
authors.initials: HT
authors.lastname: Chen
authors.forename: Tie-zhu
authors.initials: TZ
authors.lastname: Mi
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D045483:Rivers; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen