Effect Mechanism of Nutrients on Pathogenic Bacteria at The Sediment-Water Interface in Eutrophic Water

Abstract Based on the target, the research analyses the structure of the microorganism group in sediment-water interface(SWI) and two typical pathogenic bacteria ( E. coli , Eateroconcus ) of gene expesion level,the relation between nutrients using the ways of modern biology.The distribution of nutrient content at the SWI mainly shows that the content in the sediment is significantly greater than that in the overlying water body. According to the calculation of the release flux according to Fick's first law, it is found that the PO 4 3- -P in the upper reaches of the reservoir is deposited from the overlying water. In addition to sedimentation, the release rate of NH 4 + -N was significantly greater than that of PO 4 3— P. The community structure was mainly dominated by three genera of Methyloparacoccus , Methylomonas and Arenimonas . Both E.coli and Enterococcus showed that the surface sediment was larger than the overlying water body. Pearson correlation analysis showed that E.coli had a significant positive correlation with TN (P < 0.05) and TP (P < 0.05) at the SWI, while Enterococcus had a significant positive correlation with TN (P < 0.01) and TP (P < 0.01) have a very significant positive correlation.