Cyclachaena xanthiifolia (Nutt.) fresen и Ambrosia trifida L. в условиях Оренбуржья

Abstract

Results of researches of the morphometry parameters of invasive species Ambrosia trifida L. и Cyclachaena xanthiifolia (Nutt.) Fresen in the territory of the Orenburg region and assessment of levels of variability of parameters on the basis of calculation of coefficients of a variation. It is established, that the amplitude of variability of morphometric parameters of vegetative and generative organsof Ambrosia trifida L. and Cyclachaena xanthiifolia varies within the medium – very high levels, that is depending on the climatic characteristics of a particular area of research and habitat conditions. Also noted, that these species have a wide ecological range and occur mostly in undisturbed or slightly disturbed habitats, where the process of invasion occurs successfully and continues to gain momentum. The expansion of the secondary range of species in the oblast is projected.