Posouzení vlivu likvidace invazních neofytů v nivě Morávky s použitím GPS mapování – vstupní analýza

In the lower course of the River Morávka, including pSCI Niva Morávky, invasive neophytes, especially Reynoutria spp. expanded heavily after the disastrous flood in July 1997. The neophytes expand on a mass scale both in alluvial forest and in bank of gravel, one of the last habitats for critically endangered species Myricaria germanica in the Czech Republic. Since 2006 the project „Rescue of floodplain habitats in the Morávka catchment” has been developed for maintaining and sustaining of autochthonous species, supported by European Union within the framework of Life Program. A combination of mechanic and chemical agents is used to suppress the population of Reynoutria spp. This can negatively influence the occurence of species. The methods of phytosociological survey and GPS mapping is used to assess the efficiency of elimination action and its negative impacts. This article records the situation in vegetation period 2007 before the hits and describes the methodological base. A guaranteed assessment will not be possible until further investigation during the next years