“…Birch spreads generative with small, anemochory seeds, while aspen is capable of clonal growth (but it is also possible to spread generatively with seed). Accordingly, they are also able to respond to different stresses and disturbances, such as sulphuric compounds (Rauch, 2004), or fire (Štefánek, 2004(Štefánek, , Kovář et al, 2011(Štefánek, , Štefánek et al, 2012. Effect upon leaf litter of these tree species is inconsiderable (with a similar effect as above-mentioned grasses), and it appears that leaf litter decay of both species occurs approximately at the same rate (Štefánek, 2004).…”