Bohlman et al. conducted a study looking at the effects of post-fire reforestation on understory plant species richness and composition, as well as stand structure. Three different aged fires were selected to assess the role of time since fire on the different stand components.
Bohlman, G.N., North M.E., and Safford, H.D. 2016. Shrub removal in reforested post-fire areas increases native plant species richness. Forest Ecology and Management 374: 195-210. http://dx.doi.org/10.1016/j.foreco.2016.05.008