In this contribution we deal with phytocoenological and production evaluation of the original thermo- and acidophilous oak forests and secondary pine monocultures situated on the eolic sands of the Borská nížina lowland. Established differences in species composition are as follows: secondary pine forests are poorer in vascular plant species – there is a typical absence or retreat of many species, especially those typical in light-demanding broad-leaved forests. These include Anthericum ramosum, Carex caryophyllea, Betonica officinalis, Polygonatum odoratum, Vincetoxicum hirundinaria, Silene nutans and many others. There are also a few, such as Acetosella vulgaris, Calluna vulgaris, Carex ericetorum and Thymus serpyllum, which prefer pine secondary forests. On the other hand, bryophytes including Pleurozium schreberi, Pseudoscleropodium purum, and Leucobryum glaucum have distinctly higher cover in secondary pine forests. The following primary production has been established; the oak forest herb layer has 1814.5 kg.ha-1 (above ground 872.1 kg.ha-1, below ground 942.4 kg.ha-1) and that of pine forest has 472.8 kg.ha-1 (above ground 250.6 kg.ha-1, below ground 222.2 kg.ha-1). The difference in moss production is even more profound, with oak forests having only approximately 283.5 kg.ha-1, while secondary pine forests registered 1,910.8 kg.ha-1 .