Abstract: This research regarded vegetation recovery on abandoned arable as subject investigated and adopted correlation analysis and regressional analysis method to study the synergistic effect between vegetation and soil environmental factor. The reseach indicated that vegetation biomass had a significant positive relationship with vegetation coverage. They had a significant negative correlation with bulk density of soil, and positive correlation with soil total porosity, macroaggregate, water stability macroaggregate, organic matter content, total nitrogen content, hydrolyzable nitrogen content, available kalium content, microbial biomass, and microbial respiration. However, they had not significant relationship with total phosphor and availabal phosphor. At the same time, the vegetation biomass and vegetation coverage correlated soil antierodibility closely. They had significant positive correlation with soil aggregation degree and structure coefficient,and negative correlation with soil dispersive coefficient and structural damage rate. Bulk density of soil had negative correlation with soil total porosity, macroaggregate content and water stability macroaggregate content, and the soil total porosity had positive correlation with macroaggregate content and water stability macroaggregate content. The soil quality was hightened, which promoted vegetation succession in the process of vegetation recovery on abandoned arable land in eroded hilly loess plateau. Simultaneity, the vegetation succession and recovery improved soil quality. Therefore, there is synergistic effect between them.

Key words: Erosion environment, abandoned arable land, vegetation recovery, soil quality, aynergistic effect