Effect of habitat (A) [Forest versus Steppe] and seed addition (B) [Seed Addition versus No Seed Addition] on the average number of native (“NTV”), naturalized (“NTZ”), and invasive (“INV”) plants in each plot in July 2012. All plant counts are log(x+1) transformed and responses are reported as least square means estimates ± SE. Post hoc multiple pairwise comparisons were conducted with the Tukey-Kramer method; different lowercase letters indicate significant differences at a Type I error = 0.05.