title: Identification and Quantification of Nitrogen in a Reservoir, Jiaodong Peninsula, China.
abstract: Identification of nitrogen (N) sources is important in water quality control and management. Nitrogen pollution can lead to eutrophication of waterbodies and high concentrations of nitrate in drinking water can pose potential health problems. The 15N isotope and nitrogen fluxes budget approach is useful for determining the source of <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00369-ilm01.gif"/> to surface waters. In this study, mass balance and 15N isotope approaches and nitrogen flux budgets were applied to identify total nitrogen (TN) sources and nitrogen transformation processes in the Menlou Reservoir (MR), Jiaodong Peninsula, China. The different fractions of nitrogen and their 15N isotope signatures were analyzed in the reservoir water, river water, groundwater, soil, and atmospheric precipitation. The results indicate that surface runoff pollution (e.g., fertilizer and animal manure) is the main source of <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00369-ilm12.gif"/> in MR. High concentrations of TN in MR are caused by low nitrogen self-purification (denitrification) rate, low sediment adsorption capacity, and the influx of <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00369-ilm23.gif"/> rich groundwater.
authors.forename: Meng
authors.initials: M
authors.lastname: Zheng
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Sheng
authors.forename: Ruichuan
authors.initials: R
authors.lastname: Sun
authors.forename: Chongguo
authors.initials: C
authors.lastname: Tian
authors.forename: Haibo
authors.initials: H
authors.lastname: Zhang
authors.forename: Jicai
authors.initials: J
authors.lastname: Ning
authors.forename: Qiyao
authors.initials: Q
authors.lastname: Sun
authors.forename: Zhaoran
authors.initials: Z
authors.lastname: Li
authors.forename: Simon H
authors.initials: SH
authors.lastname: Bottrell
authors.forename: Robert J G
authors.initials: RJ
authors.lastname: Mortimer
mesh_terms: D002681:China; D009584:Nitrogen / Q000032:analysis*; D009587:Nitrogen Isotopes / Q000032:analysis; D014876:Water Pollution / Q000032:analysis*; D014881:Water Supply / Q000706:statistics & numerical data*
chemical_list: D009587:Nitrogen Isotopes; D009584:Nitrogen