Temporal and spatial variations and impact factors of nutrients in Bohai Bay, China

Xihan Liu; Dongyan Liu; Yujue Wang; Yajun Shi; Yanxia Wang; Xiyan Sun

doi:10.1016/j.marpolbul.2019.02.011

Temporal and spatial variations and impact factors of nutrients in Bohai Bay, China

Mar Pollut Bull. 2019 Mar:140:549-562. doi: 10.1016/j.marpolbul.2019.02.011. Epub 2019 Feb 13.

Authors

Xihan Liu¹, Dongyan Liu², Yujue Wang³, Yajun Shi⁴, Yanxia Wang⁵, Xiyan Sun⁶

Affiliations

¹ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Hebei Joint Laboratory of Coastal Ecology and Environment, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, PR China; Hebei Engineering Research Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, PR China.
² CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China.
³ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China. Electronic address: yjwang@yic.ac.cn.
⁴ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China.
⁵ Hebei Joint Laboratory of Coastal Ecology and Environment, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, PR China; Hebei Engineering Research Center for Geographic Information Application, Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, PR China.
⁶ Muping Coastal Environment Research Station, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China.

PMID: 30803676
DOI: 10.1016/j.marpolbul.2019.02.011

Abstract

The temporal and spatial distributions of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), and dissolved silicate (DSi), and their long-term changes were investigated in Bohai Bay (BHB) in spring, summer, and autumn (2013-2014). The high DIN values were consistently distributed in the western inshore waters, mainly determined by terrestrial factors, e.g., riverine input, while DIP and DSi were mostly distributed in the southern coastal waters, the central BHB, or near the sea port Caofeidian in northern BHB, largely related to non-terrestrial factors, e.g., sediment release. Based on the nutrient distribution, BHB could be partitioned into western and eastern parts, with -15 m depth as the separation. The long-term variations of nutrients since 2000 showed an increase in DIN and decreases in DIP and DSi. Relatively slow changes in DIN and DIP and a rapid decrease in DSi were exhibited in summer, which was associated with precipitation and sediment release.

Keywords: Bohai Bay; Distribution; Long-term variation; Nutrient; Partition.

MeSH terms

Bays / chemistry*
China
Environmental Monitoring
Nitrogen / analysis*
Phosphorus / analysis*
Seasons
Seawater / chemistry*
Silicates / analysis*
Spatio-Temporal Analysis
Water Pollutants, Chemical / analysis*

Substances

Silicates
Water Pollutants, Chemical
Phosphorus
Nitrogen