The semi-enclosed Bohai Sea has received large amount of pollutants from surrounding rivers and sewage channels along the densely populated and industrializing Bohai coasts,as well as the offshore oil exploration in t...The semi-enclosed Bohai Sea has received large amount of pollutants from surrounding rivers and sewage channels along the densely populated and industrializing Bohai coasts,as well as the offshore oil exploration in the sea.The concentrations of heavy metals copper,cobalt,nickel,zinc,lead,chromium and cadmium in 25 surface sediment samples from the central Bohai Sea are obtained by ICP-MS analysis.The speciation of these heavy metals is extracted and their distribution,fractionation,pollution status and sources are presented.High concentrations of copper,cobalt,nickel,zinc and chromium are found in the sediments off the coastal area of the Bohai Bay and the central Bohai Sea mud,while high concentrations of cadmium and lead are found in the sediments in the whole study area.The residual fraction is the dominant form of copper,cobalt,nickel,zinc and chromium in the surface sediments,while cadmium and lead have large proportions in the nonresidual fractions.The ecological risk assessment shows that the sediments in the study area are unpolluted with respect to the heavy metals of cobalt,nickel and chromium and unpolluted to moderately polluted with respect to copper,zinc,cadmium and lead.Cobalt,nickel and chromium mainly have natural origin and their concentrations significantly vary with the composition of the sediments.The contents of copper,zinc,lead and especially cadmium in sediments are suggested to be influenced by pollutants of human activities.The heavy metals in the surface sediments at most sampling stations are mainly come from the Huanghe River; the heavy metals in the sediments in the northernmost part of the study area are significantly affected by the sediment from the Luanhe River; while in the Bohai Bay and the central region they were affected by the sediment from the Haihe River and aerosol deposition.展开更多
In May and October 2017,12 stations were set up in the Central Bohai Sea for fishery resources investigation.The results show that there are many dominant species in this area,and the inshore fishery resources are hig...In May and October 2017,12 stations were set up in the Central Bohai Sea for fishery resources investigation.The results show that there are many dominant species in this area,and the inshore fishery resources are higher than those in the open sea because of the abundant nutrients from land,the high density of zooplankton and the food of swimming animals.In order to effectively protect the fishery resources in the Central Bohai Sea,this paper puts forward some suggestions,such as strengthening the protection propaganda,scientific and reasonable fishing,and strengthening the management of marine environment.展开更多
基金The National Natural Science Foundation of China under contract Nos 41376055 and 41530966the Open Research Fund of the Key Laboratory of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Adiminstration,China under contract No.MASEG201204the Open Research Fund of the Key Laboratory of Submarine Geosciences and Technology of Ministry of Education,Ocean University of China under contract No.201362026
文摘The semi-enclosed Bohai Sea has received large amount of pollutants from surrounding rivers and sewage channels along the densely populated and industrializing Bohai coasts,as well as the offshore oil exploration in the sea.The concentrations of heavy metals copper,cobalt,nickel,zinc,lead,chromium and cadmium in 25 surface sediment samples from the central Bohai Sea are obtained by ICP-MS analysis.The speciation of these heavy metals is extracted and their distribution,fractionation,pollution status and sources are presented.High concentrations of copper,cobalt,nickel,zinc and chromium are found in the sediments off the coastal area of the Bohai Bay and the central Bohai Sea mud,while high concentrations of cadmium and lead are found in the sediments in the whole study area.The residual fraction is the dominant form of copper,cobalt,nickel,zinc and chromium in the surface sediments,while cadmium and lead have large proportions in the nonresidual fractions.The ecological risk assessment shows that the sediments in the study area are unpolluted with respect to the heavy metals of cobalt,nickel and chromium and unpolluted to moderately polluted with respect to copper,zinc,cadmium and lead.Cobalt,nickel and chromium mainly have natural origin and their concentrations significantly vary with the composition of the sediments.The contents of copper,zinc,lead and especially cadmium in sediments are suggested to be influenced by pollutants of human activities.The heavy metals in the surface sediments at most sampling stations are mainly come from the Huanghe River; the heavy metals in the sediments in the northernmost part of the study area are significantly affected by the sediment from the Luanhe River; while in the Bohai Bay and the central region they were affected by the sediment from the Haihe River and aerosol deposition.
文摘In May and October 2017,12 stations were set up in the Central Bohai Sea for fishery resources investigation.The results show that there are many dominant species in this area,and the inshore fishery resources are higher than those in the open sea because of the abundant nutrients from land,the high density of zooplankton and the food of swimming animals.In order to effectively protect the fishery resources in the Central Bohai Sea,this paper puts forward some suggestions,such as strengthening the protection propaganda,scientific and reasonable fishing,and strengthening the management of marine environment.
