Spatiotemporal evolution of nutrients and the influencing factors in Laizhou Bay over the past 40 years

Meng Zhang; Qingyuan Lu; Dawei Wang; Dongsheng Ding; Zhengguo Cui; Honghua Shi

doi:10.1016/j.marpolbul.2022.114186

Spatiotemporal evolution of nutrients and the influencing factors in Laizhou Bay over the past 40 years

Mar Pollut Bull. 2022 Nov:184:114186. doi: 10.1016/j.marpolbul.2022.114186. Epub 2022 Oct 14.

Authors

Meng Zhang¹, Qingyuan Lu¹, Dawei Wang¹, Dongsheng Ding², Zhengguo Cui³, Honghua Shi⁴

Affiliations

¹ Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China; College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China.
² Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China; Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China.
³ Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China; Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China. Electronic address: cuizg@ysfri.ac.cn.
⁴ First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China; Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China. Electronic address: shihonghua@fio.org.cn.

PMID: 36307945
DOI: 10.1016/j.marpolbul.2022.114186

Abstract

The nutrient status in Laizhou Bay has changed in composition and structure as a result of anthropogenic activities and climate change, which has led to several environmental problems (e.g., eutrophication, organic pollution and red tides). To better understand the spatiotemporal variations in dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and eutrophication in the Laizhou Bay, we collected historical research data and conducted four cruises in 2021. The highest surface DIN was found to occur in autumn and predominantly concentrated in the southwestern bay. The highest surface DIP content was found in winter and distributed in the northwestern bay. Surface organic pollution showed estuaries as the most polluted areas. In the past 40-60 years, the DIN, DIP, and eutrophication have shown an inverted U-shaped trend, and the bay has changed from N limitation to P limitation. Economic development, phytoplankton absorption, and bottom mineral release are factors influencing the content and distribution of nutrient in the bay.

Keywords: Eutrophication; Laizhou Bay; Nutrients; Seasonal variation; Spatiotemporal distribution.

MeSH terms

Bays* / chemistry
China
Environmental Monitoring
Eutrophication
Nitrogen / analysis
Nutrients
Phosphorus / analysis
Water Pollutants, Chemical* / analysis

Substances

Water Pollutants, Chemical
Nitrogen
Phosphorus