Effect of planting Suaeda salsa on improvement of dredger filled soil

Suaeda salsa was planted to improve the physical and chemical properties of dredger filled soil with 4 plots, the soil samples were collected one year later in layers of 0 to 5cm, 5 to 20 cm and 20 to 40 cm for measuring the physical and chemical properties. The results showed that the treatment could obviously increase the total porosity, reduce the bulk density and increase soil moisture content, while the soil surface water content was obviously increased. The desalination rate of treated soil in surface layer, intermediate layer and deep layer was 50.54%, 43.74% and 27.23% respectively. However, the salinity of the control increased in each layer. Soil organic matter, available nitrogen, available phosphorus, available potassium in treatment group were increased by 17.55 %, 5.03%, 20.54% and 1.49% respectively; and the number of bacteria and actinomycete in each layer was significantly increased and the number of fungi was increased only in the intermediate and deep layers.