Analysis of the influence of some invasive plants species on the pastoral value of western Romanian grasslands

摘要

Pastoral value represents the forage potential of grassland, this being determined by the specific quality index of the species that are forming the vegetation cover. The purpose of this work is to analyse the influence of invasive plant species on grassland pastoral value. This study was carried out during 2003-2005 on 26 grasslands in western Romania. The analyses were made of 15 plant species considered on the basis of previous research to be invasive species in our plots. Pastoral value of the vegetation analysed here was found to be decreasing in successive years of the study, and the surface covered with our target species was increasing. Most of the analysed species analysed in this work are determining the decrease of the pastoral value of the grassland.