Sources and spatiotemporal variations of nitrogen and phosphorus in Liaodong Bay, China

Wanli Hou; Xi Chen; Jinhao Wu; Chong Zhang; Jianghua Yu; Jie Bai; Tiantian Chen

doi:10.1016/j.marpolbul.2022.114191

Sources and spatiotemporal variations of nitrogen and phosphorus in Liaodong Bay, China

Mar Pollut Bull. 2022 Dec;185(Pt A):114191. doi: 10.1016/j.marpolbul.2022.114191. Epub 2022 Oct 28.

Authors

Wanli Hou¹, Xi Chen², Jinhao Wu³, Chong Zhang⁴, Jianghua Yu⁵, Jie Bai¹, Tiantian Chen⁶

Affiliations

¹ Key Laboratory of Marine Environmental Science and Ecology of Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
² Marine Ecology Laboratory, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
³ Liaoning Ocean and Fisheries Science Research Institute, 116023 Dalian, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
⁴ National Marine Environmental Monitoring Center, Dalian 116023, China.
⁵ Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. Electronic address: yujh@nuist.edu.cn.
⁶ Key Laboratory of Marine Environmental Science and Ecology of Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: chentiantian@ouc.edu.cn.

PMID: 36330931
DOI: 10.1016/j.marpolbul.2022.114191

Abstract

Excessive discharge of N and P pollutants results in deterioration of marine environment quality and reduction of sustainability and safety of marine ecology. Spatiotemporal variations characteristics and sources of N and P pollutants were determined based on the long-term monitoring data in Liaodong Bay. Results indicated that an evident spatiotemporal variation was investigated for nutrients. The highest concentrations of NH₃-N, NO₂-N, NO₃-N and PO₄-P were in spring (25.32 μg/L), summer (20.67 μg/L) and autumn (222.07 μg/L, 11.08 μg/L), respectively. The hot-spots of pollutants were mainly concentrated in estuarine and aquaculture areas. The hot spot of PO₄-P gradually extended to the middle of Liaodong Bay in autumn. In addition, pollution sources in each marine functional zone were different, the main pollution source was aquaculture wastewater, river input, domestic sewage. This study provided reasonable suggestions for effectively reducing N and P pollution in Liaodong Bay, and elsewhere.

Keywords: Liaodong Bay; Nutrients pollution; Source apportionment; Spatiotemporal variation.

MeSH terms

Bays
China
Environmental Monitoring
Nitrogen / analysis
Phosphorus* / analysis
Rivers
Water Pollutants, Chemical* / analysis

Substances

Phosphorus
Nitrogen
Water Pollutants, Chemical