Abstract:Earthquake landslide is a common secondary geological disaster, which can bring a series of ecological problems such as vegetation damage, soil destruction, habitat fragmentation. So far, many scholars have investigated and studied the plant community characteristics and soil properties in earthquake landslides. They aimed at analyzing the plant community characteristics of several seismic landslides, or analyzing the soil recovery situations using the method of "space replacement time". Some scholars combined RS and GIS to study the situation of plant recovery or the spatial distribution of soil nutrition in earthquake landslides. Some papers have applied simple correlation and grey correlation to analyze the relationship between plant communities and soil properties. However, few studies have reported the comprehensive evaluation of recovery effects of plant community and soil in earthquake landslides by different recovery modes. In this paper, the plant community characteristics and soil properties of seismic landslides under different recovery ways on the eastern slope of Longmen Mountain were analyzed. Based on fuzzy mathematical model and principal component analysis, the ten years recovery effects of plant community and soil were evaluated quantitatively and comprehensively. The results showed that: (1) tree average heights and diameters at breast height in earthquake landslides were significantly lower than those in adjacent undamaged areas (P < 0.05). There was no significant difference in shrubs average basal diameters and herbs α diversity indices between the earthquake landslides and the undamaged areas (P > 0.05). And there was no significant difference in shrubs and herbs α diversity indices between artificial restoration and natural recovery (P > 0.05). (2) The soil bulk densities in earthquake landslides were significantly larger than those in adjacent undamaged areas (P < 0.05), while soil porosities and contents of alkaline nitrogen were significantly lower than those of undamaged areas (P < 0.05). Soil microbial biomass carbon, microbial biomass nitrogen and activities of dehydrogenase, protease, urease, phosphatase and sucrase in earthquake landslides were less than those in undamaged areas. (3) The synthesis scores of plant communities and soils in earthquake landslides were lower than those in adjacent undamaged areas. The synthesis scores in earthquake landslides by artificial restoration were lower than those by natural recovery. (4) After taking level-terrace site preparation, the synthesis scores were significantly lower than those in the earthquake landslides by natural recovery, and there was no significant difference in comprehensive recovery rates in the earthquake landslides planted with different tree species (P > 0.05). The synthesis scores were significantly higher in the earthquake landslides planted with Robinia pseudoacacia after taking cavernsite preparation than by natural recovery, and the synthesis recovery rates in the earthquake landslides planted with Robinia pseudoacacia were significantly higher than those of planted with Cryptomeria fortunei (P < 0.05). The synthesis recovery rates of plant communities and soils in the earthquake landslides taking cavernsite preparation were significantly higher than those of taking level-terrace site preparation (P < 0.05). The plant community characteristics and soil properties in earthquake landslides have not yet restored to the level of adjacent undamaged areas. To a certain extent, the recovery rates can be improved in earthquake landslides planted with suitable tree species after level-terrace site preparation.