Valleys of large rivers, like Bystrzyca which is one of the largest Odra river tributaries, are prone to invasions of alien plant species. The Bystrzyca river valley in Krasków-Jarnołtów section is a part of a protected landscape area but it is relatively modified by human activity. Reinforcement of the river bed may have caused the appearance of invasive species, while the process of their penetration to protected areas is a serious threat to natural plant cover. The article contains basic data concerning synanthropisation and distribution of five invasive species (Impatiens parviflora, Reynoutria japonica, Reynoutria sachalinensis, Solidago canadensis, Solidago gigantea) found within the investigated area.
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