Abstract:The photosynthesis of dominant benthic macrophytes in Sanggou Bay was measured with O2 and 14C method under laboratory condition. According to in situ investigation of macrophytes resoures, the primary productivity of macrophytes in Sarggou Bay was estimated.Results indicate that the photosyn-thetic rate of different macrophytes ranges from 1.53 to 6.84 mg/g.h(carbon fixed, O2 method) or from 0.29 to 1.93mg/g.h(carbor fixed, 14C method). The carbon assimilatory rate of macrophytes measured by 14C method is ...