Spatial-temporal characterization of main pollution factors and eutrophication evaluation in the coastal areas around Hainan Island
LI Gele
WANG Xinghua
ZHAO Qian
WANG Meng
WANG Hui
YIN Anqi
Abstract：Based on the monitored information of seawater quality in the coastal areas of Hainan Prov-ince in 2020 and using principal components analysis,we identified the pollution factors dominating the change of seawater quality,characterized spatial-temporal distribution using N/P ratio and eutrophica-tion index methods,and evaluated the nutrient structure and eutrophication level in the coastal areas a-round Hainan Island.The results showed that dissolved inorganic nitrogen and dissolved inorganic phosphorus are the main pollution factors in the coastal areas around Hainan Island in 2020,both are the highest in concentration in the normal water period.The pollution was mainly due to the terrestrial inputs.The concentrations of dissolved inorganic nitrogen and dissolved inorganic phosphorus in north-ern coastal areas were generally higher than those in southern coastal areas,especially in Haikou Bay and its adjacent sea areas,and Xinying Bay,where the pollution was mainly due to human activities and hydrodynamic forces.The highest concentrations of dissolved inorganic nitrogen and dissolved inorgan-ic phosphorus appeared in Xiaohai of Wanning in the southern area where the pollution was mainly due to aquaculture activities and hydrodynamic forces.The coastal areas around Hainan Island is considered to be a potential eutrophic area with nitrogen limited,and the eutrophication level in the coastal areas a-round Hainan Island was generally low,only serious in regional areas,especially in Xiaohai of Wan-ning.
Keywords：Hainan Islanddissolved inorganic nitrogendissolved inorganic phosphorusnutrient structureeutrophication
Publication Date：2025-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 156-162 )