A kind of mixed bacterial manure was prepared,which was composed of four bacterium,namely,Bacillus megatherium var.phosphaticum,B.mucilaginosus,Azorhizobium sp.and cellulose-decomposing microorganisms.Preservation experiments of the mixed bacterial manure were carried out under different temperature conditions.The results showed that when the temperature was 4,18 and 28 ℃,the colony counts of each preserved bacterium increased until 30 days and then almost all of them began to decline,and the total colony counts of the bacterial manure varied little among 30 days and its growth curve reached a peak and a valley when the temperature was 4 and 38 ℃ respectively.This results suggested that the bacterial manure was optimum to be preserved at 4 ℃ and be kept for 30 days,and the conditions 4—28 ℃ and 10—90 days were the matched ranges for its preservation.Potting experiments showed that at room temperature and the amount of inoculation was ≤5‰,the growth curves of Azorhizobium sp.and cellulose-decomposing microorganisms were very similar and both hadn’t a great change,but that of B.megatherium var.phosphaticum and B.mucilaginosus varied significantly with the increasing amount of inoculation. This suggested that at room temperature,the total colony counts of the bacterial manure would increase when the amount of inoculation was ≤5‰ and reached the highest value 90 days later after soil inoculation.
By research on wetland water quality and nutrient distribution in sediments of Xixi Wetland,which is the first national wetland park in China,the results indicated that the water quality had been improved especially in Wuchang Creek and Deep Pond after sediment dredging.The other inspecting points were still bad and belonged to V or worse than V standard of water quality,which would not be qualified for the tourism.The total nitrogen and phosphorus contents were low in the surface sediments(0-20 cm) of wetland.The average contents of total nitrogen and phosphorus were 1.79 g·kg-1 and 0.80 g·kg-1 respectively.Spatially,the total nitrogen and phosphorus contents were lower in center wetland than that in outside.And it was the same situation in sediment dredging creeks.The distribution of nitrogen and phosphorus in sediments profiles indicated that the accumulation of nutrients had been reduced in center wetland,while it was improved in outside creeks which were disturbed by human activities more frequently.The total nitrogen and phosphorus contents in sediments of Xixi Wetland were lower than that in other wetland.However, the results of primarily assessment remind us of paying more attention to nutrient contents in sediments of Xixi Wetland,which had reached the environmental criterions.All the conclusions above would provide useful information for the farther reclamations of Xixi Wetland.
