Abstract:A laboratory incubation experiment was carried out to investigate the effects of Corbicula fluminea bioturbation on sediment oxygen uptake and nutrient fluxes across the sediment-water interface, and the respiratory rate and excretion rate of C. fluminea in water. Sediment oxygen uptake rate and SRP, NH4+ and NO3- fluxes from sediment to the overlying water were promoted by C. fluminea bioturbation. The producing rate of NO3- from C. fluminea activities in water was not significantly different from that in the sediment-water system. The respiratory rate of C. fluminea in water was 4.3 times as much as the net oxygen uptake caused by C. fluminea in the sediment-water system. Furthermore, the excretion rates of SRP and NH4+ in water were 7.3 and 20 times as much as their net release rates caused by C. fluminea in the sediment-water system, respectively. The above differences between in water and the sediment-water system may be likely due to different living styles of C. fluminea in the two environments.