The invasion of ash-leaved maple and sea buckthorn on the Moscow path on site Irkutsk-Angarsk

Biological invasions are a very pressing problem of our time. Some invaders can have an extremely negative impact on the composition and structure of phytocenoses. For example, ash-leaved maple (American). Totally accounted 945 examples of a young plants of ash-leaved maple on the 45 km route of highway. In average on 1 km 21 plant was found. Buckthorn was accounted as 566 plants on 36 km of highway. At 7 km of the route from Angarsk and 2 km before Irkutsk, it is not founded. In average, on 1 km was counted 15.7 plants, if we count all the 45 km, then 12.6. As can be seen from the results, ash-leaved maple is more invasive. It usually appears immediately in the vicinity of cities. Its flying seeds with transport are taken from the cities, where it is naturalized, i. e. seeds were blown from the vehicles. Other situation with buckthorn: it is observed a big gap between its location and boundary of the city on this species. General rule for both Invasive species is a clear affection for the man-made structures: mounds and recesses with a missing or disturbed soil surface.