Abstract:Based on the two cruises of ecosystem co mprehensive surveys carried out in the Bohai Sea (37°N~41°N, 117.5°E~122.5°E) in Se ptember 1998 and April 1999, the distribution of phytoplankton biomass, primary productivity and its relationship with environmental factors were studied. In every cruise, there were twice station grid surveys. Between these two stat ion grid surveys, five anchor stations and a 3 days drift experiment was carried out. Water samples were taken from 0m, 5m, 10m, 20, 30m, 40m, and...