title: Degradation dynamics and bioavailability of land-based dissolved organic nitrogen in the Bohai Sea: Linking experiment with modeling.
abstract: Dissolved organic nitrogen (DON) is the major nitrogen form in the Bohai Sea. Land-based DON is released into the nitrogen pool and degraded by planktonic microbiota in coastal ocean. In this study, we evaluated the degradation of land-based DON, particularly its dynamics and bioavailability, in coastal water by linking experiment and modeling. Results showed that the degradation rate constant of DON from sewage treatment plant was significantly faster than those of other land-based sources (P<0.05). DON was classified into three categories based on dynamics and bioavailability. The supply of dissolved inorganic nitrogen (DIN) pool from the DON pool of Liao River, Hai River, and Yellow River was explored using a 3D hydrodynamic multi-DON biogeochemical model in the Bohai Sea. In the model, large amounts of DIN were supplied from DON of Liao River than the other rivers because of prolonged flushing time in Liaodong Bay.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, MOE, Ocean University of China, Qingdao 266100, China. Electronic address: likeqiang@ouc.edu.cn.
authors.forename: Keqiang
authors.initials: K
authors.lastname: Li
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, MOE, Ocean University of China, Qingdao 266100, China.
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Qingdao Research Academy of Environmental Sciences, Qingdao 266000, China. Electronic address: bunnydaq@sina.com.
authors.forename: Aiquan
authors.initials: A
authors.lastname: Dai
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, MOE, Ocean University of China, Qingdao 266100, China.
authors.forename: Xiulin
authors.initials: X
authors.lastname: Wang
mesh_terms: D008962:Models, Theoretical; D009584:Nitrogen / Q000737:chemistry*; D045483:Rivers / Q000737:chemistry; D012623:Seawater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D009584:Nitrogen
keywords: Bioavailability; Biogeochemical model; Bohai Sea; Degradation dynamics; Dissolved organic nitrogen