[Degradation of the meadow phytocenoses due to intensification of meadow management and by neglecting meadow management]

biocenose biocenosis biocoenosis checoslovaquia contaminantes industriales czechoslovakia environmental protection especies exploitation des herbages fertilizers gramineas graminee grasses grassland management grassland soils industrial pollutants manejo de praderas polluant industriel protection de l'environnement soil chemicophysical properties sol d'herbages species suelo de praderas