Windstorm effects on herbaceous vegetation in temperate forest ecosystems: Changes in plant functional diversity and species trait values along a disturbance severity gradient

•Response of functional diversity to wind disturbance depends on forest type.•Functional richness increases after wind disturbance in mixed-coniferous forests.•Species richness increases along with wind disturbance.•SLA increases along with wind disturbance, while share of stress-tolerant decreases.