The soil physical and chemical properties of sand meadow in natural restoring processes were studied.The results showed that enclosure promoted the improvement of soil physical and chemical properties.With the enclosure years increased

the soil particle composition changed significantly

the coarse particle size fractions(>0.25 mm) decreased

but the fine particle size fractions(0.05~0.25 mm) increased significantly

and the clay particle size fractions(<0.05 mm) also increased

especially in the top soil(0~10 cm).There were significant difference of organic carbon and total nitrogen content among different restoration status in each soil layer

the content of organic carbon and total nitrogen enhanced significantly in the restoring processes.With the enclosure years increased

the soil hardness increased accordingly

but the soil bulk density decreased.Correlation analysis revealed significant positive relationships between the soil carbon concentration

soil nitrogen concentration and soil fine particle size fractions(0.05~0.25 mm) and clay particle size fractions content

however

there was significant negative relationships between the soil carbon concentration

soil nitrogen concentration and soil coarse particle size fraction(0.25~2 mm) content.