Analysis of the Trend of Annual Changes of Nutrients from the Year of 2011 to 2021 inQinzhou Bay,Guangxi
The water quality and nutrition status,the trend of active phosphate and inorganic nitrogen pollutants were analyzed based on the conventional seawater quality monitoring data of the nearshore waters of Qinzhou Bay in Guangxi from 2011 to 2021 and the large-area encrypted monitoring data in 2021.The results showed that the water quality that fluctuated between Class Ⅱ and Class Ⅳ.Class Ⅳwas mainly distributed near the estuary of Haikou Hai River and Maowei Bay,which indicated that terrigenous sediment's pollution had a greater impact on water quality.The water quality in the low tide period was worse than the high tide period,mainly due to the lack of hydrodynamics in this sea area and the poor diffusion capacity of water quality.Except for 2014,2015 and 2020,the concentration of inorganic nitrogen exceeded the limit of Class Ⅱ water quality standards,and the concentration of reactive phosphate was generally on the rise.Inorganic nitrogen and reactive phosphate are the main causes of degraded water quality in Qinzhou Bay.
NETL
NSTL
万方数据
