Biogeochemistry of dissolved inorganic nutrients in an oligotrophic coastal mariculture region of the northern Shandong Peninsula, north Yellow Sea

Bo Yang; Xuelu Gao; Jianmin Zhao; Yuxi Lu; Tianci Gao

doi:10.1016/j.marpolbul.2019.110693

Biogeochemistry of dissolved inorganic nutrients in an oligotrophic coastal mariculture region of the northern Shandong Peninsula, north Yellow Sea

Mar Pollut Bull. 2020 Jan:150:110693. doi: 10.1016/j.marpolbul.2019.110693. Epub 2019 Nov 18.

Authors

Bo Yang¹, Xuelu Gao², Jianmin Zhao³, Yuxi Lu¹, Tianci Gao¹

Affiliations

¹ CAS Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, 264003, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
² CAS Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, 264003, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Electronic address: xlgao@yic.ac.cn.
³ CAS Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong, 264003, China.

PMID: 31753563
DOI: 10.1016/j.marpolbul.2019.110693

Abstract

Fourteen field cruises were carried out in a mariculture region of the northern Shandong Peninsula, North Yellow Sea, China from 2016 to 2017 for a better understanding of the biogeochemical behaviors, sources and export of dissolved inorganic nutrients. The spatial variations of nutrients were not obvious due to the influence of complex hydrological and biochemical conditions. Potential nutritional level was characterized in oligotrophy, and trophic status was rated at medium level. A preliminary estimation of nutrient budgets demonstrated that the dissolved inorganic nitrogen (DIN) load was mainly from atmospheric deposition and scallop excretion, accounting for 56.9% and 35.6% of its total influx. Scallop excretion and sediment release were the major source of phosphate (DIP), contributing to 25.2% and 44.3%, while dissolved silicon (DSi) was mainly from sediment release, accounting for 94.2%. In addition, about 136.7 × 10³, 7.3 × 10³ and 485.5 × 10³ mol km^-2 yr^-1 of DIN, DIP and DSi could be converted into other forms, e.g. organic and particulate matter and gas species.

Keywords: Biogeochemical processes; Coastal waters; Eutrophication assessment; Nutrient budget; Seasonal variations.

MeSH terms

China
Environmental Monitoring*
Nitrogen / analysis*
Phosphorus / analysis*
Water Pollutants / analysis*

Substances

Water Pollutants
Phosphorus
Nitrogen