About adventization of flora state nature reserve "Prisursky" and national park "Chavash Varmane"

The article provides data on adventization of the flora of Federal protected areas on the territory of the Chuvash Republic - three sections of the Nature Reserve «Prisursky» and the National Park «Chavash varmane». Three new invasive species - Bidens frondosa, Lupinus polyphyllus , and Solidago сanadensis have been identified for the Nature Reserve «Prisursky» flora. A small proportion of the adventive fraction of the flora of large protected areas reflects the minor disturbance and relative stability of their indigenous phytocenoses. In fragmented areas of the steppe above adventization flora and the capture rate of territories invasive species, due to greater anthropogenic disturbance, absence of buffer zones, vulnerability to introduction of seeds and naturalization of alien species, a small area. To prevent further transformation of the vegetation cover of protected areas, it is necessary to create protection zones with an appropriate regime of nature management and conduct floral monitoring.