Key Laboratory of Marine Chemistry Theory and Technology, MOE, Ocean University of China, Qingdao 266100, China.
Key Laboratory of Marine Chemistry Theory and Technology, MOE, Ocean University of China, Qingdao 266100, China.
Mar Pollut Bull. 2017 Nov 30;124(2):856-870. doi: 10.1016/j.marpolbul.2017.02.033. Epub 2017 Feb 24.
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.
溶解有机氮（DON）是渤海的主要氮形态。陆源 DON 被释放到氮库中，并由沿海浮游微生物群落降解。在这项研究中，我们通过实验和建模相结合的方法，评估了沿海水中陆源 DON 的降解情况，特别是其动态和生物可利用性。结果表明，污水处理厂 DON 的降解速率常数明显快于其他陆源 DON（P<0.05）。根据动力学和生物可利用性，将 DON 分为三类。利用渤海三维水动力多 DON 生源地化学模型，探讨了来自辽河、海河和黄河 DON 库的溶解无机氮（DIN）库对其的供应情况。在该模型中，由于辽东湾的冲刷时间较长，因此来自辽河 DON 的大量 DIN 得到供应，超过了其他河流。
