Nutrient transport in rivers around the Bohai Sea and its environmental implications
The nutrient concentration,flux and structure of 24 major rivers around the Bohai Sea(BS)during the dry season of 2017 and the flood seasons of 2019,2020 and 2021 were analyzed.The results showed that the dissolved inorganic nitrogen(DIN)concentration in rivers around the BS was higher compared with other rivers of the world,and nitrate(NO3-)was the principal form of DIN.While concentrations of dissolved silicate(DSi)and dissolved inorganic phosphorus(DIP)around the BS were lower than those in the world rivers.About 0.61 Gmol ammonia(NH4+),0.24 Gmol nitrite(NO2-),4.85 Gmol NO3-,0.02 Gmol DIP and 3.27 Gmol DSi,respectively,were transported to the BS annually by these rivers.The small rivers around the BS played an important role in the nutrient delivery,especially the DIP transportation,accounting for more than 80％of the DIP flux of rivers around the BS.And the fluxes of DIN,DIP and DSi in terms of drainage basin area of small rivers were higher than those of the Yellow River.Compared with other rivers of the world,the nutrient composition in rivers around the BS was incongruous with high DIN/DIP(N/P)ratio,high DSi/DIP(Si/P)ratio and low DSi/DIN(Si/N)ratio,and the phosphorus limitation was significant.Imbalance of nutrient delivery from rivers may affect the primary production and environment evolution in the Bohai Sea,which should deserve further attention.
rivers around the Bohai Seanutrientnutrient structurefluxthe Bohai Sea
万方数据
维普
