Degradation dynamics and bioavailability of land-based dissolved organic nitrogen in the Bohai Sea: Linking experiment with modeling

作者：Li, Keqiang^*; Ma, Yunpeng; Dai, Aiquan^*; Wang, Xiulin

来源：Marine Pollution Bulletin, 2017, 124(2): 856-870.

DOI：10.1016/j.marpolbul.2017.02.033

• Dissolved organic nitrogen
• Bioavailability
• Degradation dynamics
• Biogeochemical model
• Bohai Sea

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.

• 出版日期2017-11-30
• 单位中国海洋大学; 中国环境科学研究院