To understand the differences of plant biomass characteristics and soil chemical and physical properties from different plant communities in the process of sand dune restoration, this paper examined the above-groundand below-ground biomass of mobile dune, semi-fixed dune, fixed dune, sandy grasslandfour habitats, and analyzed characteristics of soil properties and their relationships by separatingsoil into 4 layers. The results showed that plant aboveground biomass and below-ground biomass had significantly positive correlation, and the 0-10 cm depth soil layer had the largest biomass. With the fixation of sand dune, 10-20, 20-40, 40-60 cm depth belowground biomass increased significantly, and the aboveground biomass increased successively in 2.20, 98.10, 131.41, 190.38 g·m-2; below-aboveground biomass ratio was 10.44, 1.67, 0.81, 1.18 respectively. In the process of sand dune stabilization, soil bulk density in the surface layer dropped from 1.62 g·cm3 to 1.33 g·cm3; the percentage of silt sand and very fine sand from each soil layer went up, while medium grained sand went down successively; soil carbon and nitrogen content, pH, EC all accumulated gradually. Below-ground biomass had significantly positive correlation with soil carbon and nitrogen content, pH, EC; both soil carbon and nitrogen content positively related with pH, EC and soil moisture, but negatively correlated with soil bulk density (p<0.05). In conclusion, the augment of plant biomass was strongly linked with the refinement of surface layer soil particle, increase of nutrient substance and water content in the process of dune restoration; soil-vegetation systems are integrated comprehensive units.
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