With the rapid development of industrialization and urbanization of coastal regions,eutrophication and metal pollution have caused serious environmental problems in China.To better understand the potential environment...With the rapid development of industrialization and urbanization of coastal regions,eutrophication and metal pollution have caused serious environmental problems in China.To better understand the potential environmental risks associated with nutrients and heavy metals,the surface water was comprehensively investigated in the coastal Bohai Sea.A total of 150 sites were sampled from seven coastal regions,and the concentrations of nutrients(DIN and DIP)and metals(Cd,Pb,Zn,Cu,Cr,As and Hg)in the surface seawater were measured.The results showed that the DIN concentration of about 50%sites exceeded the Grade-I of Seawater Quality Standard of China.Due to high concentrations of DIN,the status of eutrophication was serious in the Bohai Bay and Shuangtaizi Estuary.According to Seawater Quality Standard of China,Pb,Zn,Hg and Cu were the main metal pollutants in the coastal Bohai Sea.There was generally low ecological risk caused by heavy metals,but certain hotspots existed near Shuangtaizi Estuary and Changxingdao Island.展开更多
Throughy the study on the ecological effects of Cd and Zn on several aquatic plants,the ecological sensitivity of 5 species is determined.The results show that according to critical time when plants are injured by Cd ...Throughy the study on the ecological effects of Cd and Zn on several aquatic plants,the ecological sensitivity of 5 species is determined.The results show that according to critical time when plants are injured by Cd and Zn,the order for ecological sensitivity of 5 species is: Nymphoides peltatum>Hydrilla verticillata>Potamogeton malaianus>Spirodela polyrhiza>Alternanthera philoxeroides. The results also show that on basis of catalase activity of aquatic plants,the order for ecological sensitivity of 5 species is: Alternanthera philoxeroides>Spirodela polyrhiza≈Potamogeton malaianus>Hydrilla verticillata>Nymphoides peltatum. It is evident that the pollution durablty Potamogeton malaianus is higher than for Nymphoides peltatum and Hydrilla verticillata ,pollution sensible species.展开更多
基金grant from the National Natural Science Foundation of China(No.31572595).
文摘With the rapid development of industrialization and urbanization of coastal regions,eutrophication and metal pollution have caused serious environmental problems in China.To better understand the potential environmental risks associated with nutrients and heavy metals,the surface water was comprehensively investigated in the coastal Bohai Sea.A total of 150 sites were sampled from seven coastal regions,and the concentrations of nutrients(DIN and DIP)and metals(Cd,Pb,Zn,Cu,Cr,As and Hg)in the surface seawater were measured.The results showed that the DIN concentration of about 50%sites exceeded the Grade-I of Seawater Quality Standard of China.Due to high concentrations of DIN,the status of eutrophication was serious in the Bohai Bay and Shuangtaizi Estuary.According to Seawater Quality Standard of China,Pb,Zn,Hg and Cu were the main metal pollutants in the coastal Bohai Sea.There was generally low ecological risk caused by heavy metals,but certain hotspots existed near Shuangtaizi Estuary and Changxingdao Island.
文摘Throughy the study on the ecological effects of Cd and Zn on several aquatic plants,the ecological sensitivity of 5 species is determined.The results show that according to critical time when plants are injured by Cd and Zn,the order for ecological sensitivity of 5 species is: Nymphoides peltatum>Hydrilla verticillata>Potamogeton malaianus>Spirodela polyrhiza>Alternanthera philoxeroides. The results also show that on basis of catalase activity of aquatic plants,the order for ecological sensitivity of 5 species is: Alternanthera philoxeroides>Spirodela polyrhiza≈Potamogeton malaianus>Hydrilla verticillata>Nymphoides peltatum. It is evident that the pollution durablty Potamogeton malaianus is higher than for Nymphoides peltatum and Hydrilla verticillata ,pollution sensible species.
