| The sulfide in mariculture environments could not only influence directly the seawater environmental qualities, but also induce the pollution of sediment environments and result in impairments of the shellfish cultured. In this study, laboratory experiment and field experiment were used to investigate the restoration of sulfide in sediment environment of shellfish mudflat culture areas. And two methods on restoration of sediment environment were involved, one was bioremediation（the densities of Perinereis aibuhitensis were 0.07 kg·m-2, 0.14 kg·m-2, 0.21 kg·m-2 and 0.28 kg·m-2 respectively）, and the other was physical way（only beach ploughing, both covering sand and beach ploughing）. The results indicated that two physical ways had achieved significant results in both laboratory experiment and field experiment（P＜0.05）, and the result of both covering sand and beach ploughing was better than only beach ploughing in both two experiments, and the effect of ploughed 30cm was better than ploughed 20 cm in laboratory experiment. Compared with the control group of bioremediation, all density groups of Perinereis aibuhitensis reduced the concentration of sulfide in sediment environment, and the effects of 0.14 kg·m-2 and 0.21 kg·m-2 were prominent（P＜0.05）. The effect of Perinereis aibuhitensis was enhanced with increasing density, and 0.21 kg·m-2 was the best treatment group（the removal percentage of sulfide was 29.31%）, however, when the density of Perinereis aibuhitensis increased to 0.28 kg·m-2, the removal percentage of sulfide decrease（only 17.36%）. |
