关键词: 粪肠球菌, 粪肠球菌, fsr群体感应系统, 毒力基因, 抑制剂

Abstract: A comprehensive study on vegetation and soil quality of coastal dredger fill in different dredged years was conducted through a field investigation, to determine the constraining characteristics of the coastal dredger fill in different dredged years. The results showed that: biomass was positively correlated with the dredged time of the coastal dredger fill, the soil surface was basically bare and Suaeda salsa was little in the early time of the dredger fill; after the deposition of 3 to 5 years, the dredger fill was initially invaded by the plants of Kochiascoparia and Atriplex and the biomass of Suaeda salsa significantly increased; after 6 deposition years, the Suaeda salsa on the ground of the dredger fill increased to a large amount; the bulk density of the dredger fill in different dredged years was light and had large field capacity; soil organic matter content was low and nitrogen was lacking, while the contents of available phosphorus and available potassium were rich in different dredged years; the average soil salt content whose determined ions were Na and Cl- was above 30 g/kg; the soil pH was between 8.4 and 8.8 and ESP was all more than 30%, which showed that the dredger fill was strong alkaline soil; the migrations and redistributions of soil salt ions were limited to be between the surface and the subsurface within the first 5 years; the soil at 1 m depth began to desalination 6 years later. Tight clay soil, high salt content, strong alkaline, poor organic matter and nitrogen were the constraining characteristics of the coastal dredger fill in different dredged years.