Figure 2

Dispersal ability of the alien plant species across China in six risk ranks. (a) Natural dispersal ability; (b) anthropogenic dispersal ability; (c) overall dispersal ability. (I) Rank I: malignant invaders; (II) rank II: serious invaders; (III) rank III: local invaders; (IV) rank IV: mild invaders; (V) rank V: species requiring further observation; and (VI) rank VI: cultivated alien species. The plot was drawn by SigmaPlot 10.0 (https://systat-sigmaplot.com).