Vegetation characteristics in the studied mounds (grasslands, former croplands and former plantations): A species richness of grassland species B species richness of weeds C cover of grassland species D cover of weeds E cover-weighted ecological indicator scores for nutrients (NB) F cover-weighted ecological indicator scores for water (WB) G cover-weighted ecological indicator scores for light (LB) H naturalness score. Different letters indicate significant differences between groups (Tukey test, p ≤ 0.05).