The spatial and temporal distribution of the biogenic elements sedimentation flux in the East China Sea and the Yellow Sea

Core sediment samples named 10594, 10694, 12694, H1-18 were collected during cruises in the East China Sea and the Yellow Sea in April and October of 2006, combining with the results of the210Pb dating to the biogenic elements (total nitrogen、total phosphorus、total organic carbon)of about lated 200 years.The vertical distribution profiles revealed that the total nitrogen(TN) content in the four stations was relatively similar, from deep to shallow layer the contents of TN showed the extended tendency, till the depth about 50、60 era of 20th century the highest value was found and then showed waving downward trend; The vertical distribution of total phosphorus(TP) in the four stations revealed stable extended tendency and there was no highest points from deep to shallow layer; the contents of total organic carbon (TOC)showed the upward trend from deep to shallow layer, the highest content was found in the station 10594, 10694 at about 60 era of 20th century, as well as, the highest content were found at station12694, H1-18 at about 40 era of 20th century and then the contents of TOC reduced; The results showed that the mean value of biogenic elements content of surface sediments was governed by the kuroshio, for the reason that the productivity of the kuroshio was lower than the other area of the Yellow Sea and the content of biogenic elements was lower.However, in the station H1-18 the content of biogenic elements was complex, which may be caused by the complicated hydrologic conditions and continental input matter around the area.