ABSTRACT
Abstract ................................................................................................. 405 22.1 Introduction ................................................................................ 406 22.2 Materials and Methodology ....................................................... 406 22.3 Results and Discussion .............................................................. 407 22.4 Conclusions ................................................................................ 419 Keywords .............................................................................................. 421 References ............................................................................................. 421
ABSTRACT
In the evolutionary development herbaceous ecosystems elaborated the ways of protection from excess weight of wild large herd phytophages. Absence of this protection would lead not only to the disappearance of grassland vegetation but also to loss of soil due erosion processes. The author of this study believes that general protection measures include decrease of natural pasture productivity as a result of the change of
vegetation cover, the manifestation of forage herbs toxicity under unfavorable growth conditions and at destruction of the sod due to ungulates – the appearance of weeds which have poisonous and repellent properties and so not consumed by the animals; then the normal herbage restores.
