Independence test of functional trait matrix and Mantel’s analysis between exotic plant species invasiveness and functional traits. SDM, SL, SGE, SNPI, PH and LMA refer to seed dry mass (mg), seed bank longevity (year), seed germination efficiency (%), seed number per individual, plant height (m) and special leaf area (mg/mm²), respectively. ‘Invasive’ refers to if the species is invasive and ‘level’ refers to the invasive level.